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Designing of an inflammatory knee joint thermogram dataset for arthritis classification using deep convolution neural network. Quant. InfraRed Thermogr. J. (IF 1.231) Pub Date : 2020-12-15 Shawli Bardhan; Satyabrata Nath; Tathagata Debnath; Debotosh Bhattacharjee; Mrinal Kanti Bhowmik
ABSTRACT Limited application of thermography for inflammatory joint disease diagnosis is due to unavailability of joint thermogram dataset and formulated protocol of data acquisition. Focusing on the limitations, we aimed on creation and analysis of knee thermogram dataset by introducing standardized protocols of acquisition. The dataset named as “Infrared Knee Joint Dataset”, and includes healthy
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Investigation on dual-domain data processing algorithm used in thermal non-destructive evaluation Quant. InfraRed Thermogr. J. (IF 1.231) Pub Date : 2020-11-09 Slawomir Grys; Sebastian Dudzik
ABSTRACT The paper presents the results of research on the data processing algorithm used to detect material defects using active thermography. The algorithm allows the analysis of thermogram sequences in both time and image domain. In the first stage of the algorithm operation, mathematical morphology or filtered contrast methods are used to remove the uneven heating from the sample, as well as to
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In-situ monitoring of a laser metal deposition (LMD) process: comparison of MWIR, SWIR and high-speed NIR thermography Quant. InfraRed Thermogr. J. (IF 1.231) Pub Date : 2020-11-04 Simon J. Altenburg; Anne Straße; Andrey Gumenyuk; Christiane Maierhofer
ABSTRACT Additive manufacturing offers a range of novel applications. However, the manufacturing process is complex and the production of almost defect-free parts with high reliability and durability is still a challenge. Thermography is a valuable tool for process surveillance, especially in metal additive manufacturing processes. The high process temperatures allow one to use cameras usually operating
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New approach for layer thickness measurements of coatings using pulsed lock-in thermography Quant. InfraRed Thermogr. J. (IF 1.231) Pub Date : 2020-09-22 D. Hoffmann; M. Bastian; G. Schober
The coating of materials has grown to an important treatment for improving functionality and appearance of components. A decisive factor for a reliable and consistent performance in its field of application is the layer thickness of coated materials. Consequently, monitoring and controlling the thickness, especially the homogeneity of the coating, represent relevant tasks on a large scope. Active thermography
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Defect shape detection and defect reconstruction in active thermography by means of two-dimensional convolutional neural network as well as spatiotemporal convolutional LSTM network Quant. InfraRed Thermogr. J. (IF 1.231) Pub Date : 2020-09-13 David Müller; Udo Netzelmann; Bernd Valeske
A neural network (NN) for semantic segmentation (U-Net) was used for the detection of crack-type defects from thermography sequences. For this task, data sequences of forged steel parts were acquired through induction thermography and the corresponding phase images calculated. The results for defect detection were quantitatively evaluated using Intersection over Union (IoU) metric. Further, a combination
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Automatic extraction of canopy and artificial reference temperatures for determination of crop water stress indices by using thermal imaging technique and a fuzzy-based image-processing algorithm Quant. InfraRed Thermogr. J. (IF 1.231) Pub Date : 2020-09-10 Pedram Shoa; Abbas Hemmat; Rassoul Amirfattahi; Mahdi Gheysari
Thermal stress indicators are one of the most accurate indices for sensing plant water status that can be remotely measured by the means of infrared thermography. In addition to the canopy temperature, these indices need to access the wet and dry reference temperatures which refer to the temperatures of the canopy at well-watered and fully stressed conditions, respectively. The main goal of this study
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In situ quantitative diagnosis of insulated building walls using passive infrared thermography Quant. InfraRed Thermogr. J. (IF 1.231) Pub Date : 2020-08-23 M. H. A. Larbi Youcef; V. Feuillet; L. Ibos; Y. Candau
The research project DPE-IITI aims to carry out the in situ diagnosis of energy performance of buildings by quantifying the insulation level of walls. The on site monitoring method is based on the use of passive infrared thermography, meteorological measurements (air temperatures, solar flux), thermal modelling and identification algorithm. A measurement campaign was conducted in a school in the city
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Quantitative measurement of cast metal relics by pulsed thermal imaging Quant. InfraRed Thermogr. J. (IF 1.231) Pub Date : 2020-07-28 Ning Tao; Congsi Wang; Cunlin Zhang; Jiangang Sun
Corrosion in cast metal relics has always been a concern for the conservation and restoration of ancient culture relics. In recent years, there is an increased interest in the determination of the corrosion/rust thickness and the substrate thickness of bronze and iron cultural relics. The solution of this problem is of great significance in the evaluation of the corrosion status, rust cleaning, and
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Detection of dis-bond between honeycomb and composite facesheet of an Inner Fixed Structure bond panel of a jet engine nacelle using infrared thermographic techniques Quant. InfraRed Thermogr. J. (IF 1.231) Pub Date : 2020-07-23 Renil Thomas Kidangan; Krishnamurthy Venkata; Krishnan Balasubramaniam
The Inner Fixed Structure (IFS) bond panel is a honeycomb sandwich panel with CFRP facesheet and a heat shield on one side, and a perforated CFRP facesheet on the other side, of a jet engine nacelle. It is subjected to extreme temperature on both sides which damages the inner epoxy adhesive bond between the facesheet and the honeycomb core. Accessibility to this layer for non-destructive evaluation
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A robust optical flow motion estimation and correction method for IRT imaging in brain surgery Quant. InfraRed Thermogr. J. (IF 1.231) Pub Date : 2020-07-22 Yahya Moshaei-Nezhad; Juliane Müller; Christian Schnabel; Matthias Kirsch; Ronald Tetzlaff
In brain surgery, respiration motion, outliers, and occlusions create artefacts in Infrared Thermography (IRT) imaging. In this paper, we propose a robust method to handle multiple motion, outliers, and occlusions in IRT images which consists of two phases: preprocessing and image motion estimation. In the preprocessing phase, the Region of Interest (RoI) segmentation is employed to extract the brain
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Methodology to evaluate temperature changes in multiple sclerosis patients by calculating texture features from infrared thermography images Quant. InfraRed Thermogr. J. (IF 1.231) Pub Date : 2020-07-13 Sandra Pérez-Buitrago; Sara Tobón-Pareja; Yeraldín Gómez-Gaviria; Adriana Guerrero-Peña; Gloria Díaz-Londoño
Multiple sclerosis (MS) is a progressive and degenerative disease that causes nerve conduction blocks due to demyelination in the central nervous system. Most MS patients experience a worsening of clinical signs and neurological symptoms when they are exposed to heat due to a thermoregulatory dysfunction. This paper proposes a novel methodology to understand temperature changes in MS patients by obtaining
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Thermal resistance field estimations from IR thermography using multiscale Bayesian inference Quant. InfraRed Thermogr. J. (IF 1.231) Pub Date : 2020-07-06 C. Pradere; M.M. Groz; A. Sommier; E. Abisset; S. Chevalier; J.L. Battaglia; J.C. Batsale
The main goal of this paper is the estimation of thermal resistive fields in multilayer samples using the classical front face flash method as excitation and InfRared Thermography (IRT) as a monitoring sensor. The complete inverse processing of a multilayer analytical model can be difficult due to a lack of sensitivity to certain parameters (layer thickness, depth of thermal resistance, etc.) or processing
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A novel algorithm for infrared image contrast enhancement based on neutrosophic sets Quant. InfraRed Thermogr. J. (IF 1.231) Pub Date : 2020-07-01 Tong Zhang; Xuxu Zhang
Due to the narrow thermal window of infrared (IR) image sensor array, the represented image becomes dim and its details become blurred. Different contrast and detail enhancement technologies were deployed to improve image quality. An enhancement algorithm with bilateral filter is a state of art method, which first transforms an infrared image into a base part and a detail part, and then expands the
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Detection of breast cancer tumours based on feature reduction and classification of thermograms Quant. InfraRed Thermogr. J. (IF 1.231) Pub Date : 2020-06-15 Vartika Mishra; Santanu Kumar Rath
The patients having malignant breast tumours if detected in early stage have a better chance of survival. It is observed that the analysis of the texture features of the breast thermograms helps in providing the right information for diagnosis to a greater extent. In this study, the breast thermograms of 56 subjects having temperature recordings available at Database Mastology Research (DMR), visual
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Vibro-thermography of calibrated defects in hybrid plates focusing on viscoelastic heat generation Quant. InfraRed Thermogr. J. (IF 1.231) Pub Date : 2020-06-12 Xingwang Guo; Liang Zhu
Ultrasound excited vibro-thermography is based on the local heat generation due to the friction between the opposite surfaces of the defect, the plastic deformation around the defect, and/or the viscoelastic loss. This paper presents vibro-thermography applied to hybrid plates containing viscoelastic material when the viscoelastic heat generation mechanism alone is considered. The debonding-like calibrated
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Effect of micro climatic indices on the accuracy of thermographic plant water status monitoring, case study of a semi-arid area Quant. InfraRed Thermogr. J. (IF 1.231) Pub Date : 2020-05-20 Pedram Shoa; Abbas Hemmat; Mahdi Gheysari; Rassoul Amirfattahi
Plant water stress can be remotely monitored by means of thermography due to its increasing effect on plant temperature. For a more accurate estimation of plant water status, its temperature should be normalised against environmental conditions. In this paper, the aim was to investigate a recently proposed method of normalisation using artificial reference surfaces, different measurement times in a
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Thermoelastic effect in compacted steel wire ropes under uniaxial loading Quant. InfraRed Thermogr. J. (IF 1.231) Pub Date : 2020-05-19 Piotr Szade; Mariusz Szot; Bogusław Kubiś
The aim of the research presented in this work was to verify the occurrence of the thermoelastic effect in compacted steel wire ropes for future research applications and TSA methods. It was examined using a Testo 890 thermal camera during tests consisting of 10 cycles of loading of rope samples to levels under the yield stress, performed on a tensile strength machine. Average measured changes of temperature
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Theoretical basics of radiant heat transfer – practical examples of calculation for the infrared (IR) used in infrared thermography measurements Quant. InfraRed Thermogr. J. (IF 1.231) Pub Date : 2020-04-11 Waldemar Minkina
The article presents the theoretical basics and definitions of radiant heat transfer with practical examples of calculation for the infrared (IR) used in infrared thermography measurements. In order to illustrate the practical possibilities of using the theoretical basics described for radiant heat transfer, the article presents some original, useful and practical examples including author’s methods
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Effect of unidirectional freezing using a thermal camera on polyvinyl (alcohol) for aligned porous cryogels Quant. InfraRed Thermogr. J. (IF 1.231) Pub Date : 2020-03-18 Gabriel Goetten de Lima; Rêydila Rayenne Caminhas Barbosa; Mayara Pazin de Andrade Santos; Bor Shin Chee; Washington Luiz Esteves Magalhães; Declan M. Devine; Michael J. D. Nugent
Unidirectional freeze casting for polymers and ceramics has been performed extensively; however, the mechanisms involved in unidirectional freezing are not thoroughly understood and therefore, in this study, polyvinyl (alcohol) hydrogels were freeze-thawed by unidirectional freezing and the resultant freezing profile was investigated using thermal imagery to comprehend the physical mechanism involved
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Non-contact temperature measurement at the Physikalisch-Technische Bundesanstalt (PTB) Quant. InfraRed Thermogr. J. (IF 1.231) Pub Date : 2020-03-13 I. Müller; A. Adibekyan; K. Anhalt; C. Baltruschat; B. Gutschwager; S. König; E. Kononogova; C. Monte; M. Reiniger; S. Schiller; D. R. Taubert; D. Urban; J. Hollandt
At the Physikalisch-Technische Bundesanstalt, the National Metrology Institute of the Federal Republic of Germany, the traceability of non-contact temperature measurement to the International Temperature Scale (ITS-90) is realised without gaps over a temperature range from −170°C to 3000°C. In this paper the main calibration facilities for the calibration of radiation thermometers at temperatures above
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Effectiveness of active dynamic and passive thermography in the detection of maxillary sinusitis Quant. InfraRed Thermogr. J. (IF 1.231) Pub Date : 2020-03-02 Jaspreet Singh; Ajat Shatru Arora
This paper presents a novel approach for sinusitis detection by means of thermography. So far, the role of passive static thermography (PST) for diagnosing the sinusitis has been remarked by many studies. But, it has not been proved as an effective approach for sinusitis detection. With this aim, the automatic and active dynamic thermography (ADT) based approach has been proposed. The study has four
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Deep learning based thermal image segmentation for laboratory animals tracking Quant. InfraRed Thermogr. J. (IF 1.231) Pub Date : 2020-02-06 Magdalena Mazur-Milecka; Jacek Ruminski
Automated systems for behaviour classification of laboratory animals are an attractive alternative to manual scoring. However, the proper animals separation and tracking, especially when they are in close contact, is the bottleneck of the behaviour analysis systems. In this paper, we propose a method for the segmentation of thermal images of laboratory rats that are in close contact during social behaviour
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Use of laser spot thermography for the non-destructive imaging of thermal fatigue microcracking of a coated ceramic matrix composite Quant. InfraRed Thermogr. J. (IF 1.231) Pub Date : 2019-12-25 Thibaut Archer; Pierre Beauchêne; Bruno Passilly; Jean-Michel Roche
In this paper, an environmental barrier coating (EBC), which has undergone thermal cycling under spatiotemporal gradients, is inspected using active thermography. The technique considered herein is known as laser spot thermography. This study deals with the detection of a very thin crack network of unknown orientation. A numerical analysis is presented to investigate the sensitivity of experimental
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Inter and intraexaminer reliability of a new method of infrared thermography analysis of patellar tendon Quant. InfraRed Thermogr. J. (IF 1.231) Pub Date : 2019-12-17 Javier Molina-Payá; José Ríos-Díaz; Jacinto Martínez-Payá
Thermography is an imaging technique that records the infrared radiation of the skin with a potential to detect asymmetries in body temperature and relating them to pathologies or risk of injury. However, the location of landmarks and region of interest (ROI) can influence the recording process. In this study we describe the reliability of a method to select the ROI without modifying the original thermogram
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Characterisation of the heat transfer in displaced enhancement devices by means of inverse problem approach applied to IR images Quant. InfraRed Thermogr. J. (IF 1.231) Pub Date : 2019-12-17 F. Bozzoli; L. Cattani; A. Mocerino; S. Rainieri; I. Tougri; M.J. Colaço
Displaced enhancement devices are inserts positioned inside pipes that increase the heat transfer rate. This study presents an original application of an inverse analysis technique to experimental infrared temperature data to estimate the local convective heat flux for forced convection flow in a pipe in which this kind of device is present. Butterfly-shaped inserts have been investigated to determine
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Proposal for a protocol using an infrared microbolometer camera and wavelet analysis to study foot thermoregulation Quant. InfraRed Thermogr. J. (IF 1.231) Pub Date : 2019-12-09 Vincent Serantoni; Franck Jourdan; Hervé Louche; Ariane Sultan
Here we propose a protocol to (i) generate skin temperature (SkT) oscillations on glabrous tissues (plantar foot) in healthy subjects under controlled clinical environment conditions; (ii) measure quantitative temperature fields with an inexpensive microbolometer (MB) infrared camera in a clinical environment; and (iii) quantify the characteristics of skin temperature (SkT) oscillations through spectral
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Thermographic inspection of water ingress in composite honeycomb sandwich structure: a quantitative comparison among Lock-in thermography algorithms Quant. InfraRed Thermogr. J. (IF 1.231) Pub Date : 2019-12-06 Ranjit Shrestha; Manyong Choi; Wontae Kim
The increasing use of honeycomb structures in the aircraft industry has demonstrated the need for the development of more effective evaluation methodologies. In recent years, thermography has received vast and growing attention as a reliable technique for non-destructive testing and evaluation of composite materials due to its remarkable advantages of non-contact, full area coverage, high speed, safe
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Active thermography for quality assurance of 3D-printed polymer structures Quant. InfraRed Thermogr. J. (IF 1.231) Pub Date : 2019-11-19 Christian Metz; Philipp Franz; Christian Fischer; Volker Wachtendorf; Christiane Maierhofer
Additively manufactured test specimens made of polyamide 12 (PA 12) by Laser Sintering as well as of acrylonitrile butadiene styrene (ABS) by Fused Layer Modelling, were characterised with active thermography directly after manufacturing and after artificial weathering. For this, two different excitation methods (flash and pulse heating) were used and compared, regarding their suitability for the detection
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Experimental validation of the diffusion function model for accuracy-enhanced thermoreflectometry Quant. InfraRed Thermogr. J. (IF 1.231) Pub Date : 2019-10-30 Benjamin Javaudin; Rémi Gilblas; Thierry Sentenac; Yannick Le Maoult
In the field of thermography, the main problem in measuring true temperature lies in determining the emissivity. Thermoreflectometry overcomes this problem by an in-situ emissivity determination method based on bidirectional reflectivity measurement. This method introduces a diffusion function model which links the bidirectional reflectivity measured to the emissivity. The true temperature and the
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Non-destructive inspection system for MAG welding processes by combining multimodal data Quant. InfraRed Thermogr. J. (IF 1.231) Pub Date : 2019-10-24 Katharina Simmen; Benjamin Buch; Andreas Breitbarth; Gunther Notni
Welding processes are influenced by many parameters. By merging data to multimodal information from multichannel images and signals of various welding parameters, the correlation of these and their influence on weld seam imperfections are investigated. The application of a multispectral area camera array enables a new approach on non-destructive testing particularly supported by the passive thermography
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Suitability of lock-in infrared thermography for luminescent glass development Quant. InfraRed Thermogr. J. (IF 1.231) Pub Date : 2019-10-14 Peter W. Nolte; Nils Ziegeler; A. Charlotte Rimbach; Stefan Schweizer
ABSTRACT The purpose of this work is to evaluate the suitability of lock-in infrared thermography for luminescent glass development. Lithium borate glass of different composition is fabricated and studied to detect changes in the thermal diffusivity as the composition changes and property modifiers are introduced. In addition, the effect of terbium doping on the thermal diffusivity of the glass is
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NDT inspection of aeronautical components by projected thermal diffusivity analysis Quant. InfraRed Thermogr. J. (IF 1.231) Pub Date : 2019-09-17 P. Venegas; J. Perán; R. Usamentiaga; I. Sáez De Ocáriz
This paper analyzes the application of an innovative method for thermographic NDT data processing to inspections on real aeronautical components. The results provided by this method are related to thermal diffusivity values obtained by projecting the characteristics of a 3D thermal diffusion model onto one of the coordinate planes. In previous studies, laboratory experiments demonstrated that this
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Lock-in thermography on moving samples: amazing mismatch between amplitude and phase Quant. InfraRed Thermogr. J. (IF 1.231) Pub Date : 2019-09-12 A. Salazar; L. Zamanillo; M. Colom; A. Mendioroz; U. Galietti; A. Sommier; J.C. Batsale; C. Pradere
ABSTRACT We have obtained an analytical expression for the surface temperature of a sample that is moving at constant velocity when it is illuminated by a modulated and focused laser beam, which remains at rest. From this expression it is found that while the temperature amplitude thermogram shows the expected elongated shape in the direction of the sample movement, the phase thermogram surprisingly
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Blind structured illumination as excitation for super-resolution photothermal radiometry Quant. InfraRed Thermogr. J. (IF 1.231) Pub Date : 2019-08-29 Peter Burgholzer; Thomas Berer; Mathias Ziegler; Erik Thiel; Samim Ahmadi; Jürgen Gruber; Günther Mayr; Günther Hendorfer
ABSTRACT Photothermal radiometry with an infrared camera allows the contactless temperature measurement of multiple surface pixels simultaneously. A short light pulse heats the sample. The heat propagates through the sample by diffusion and the corresponding temperature evolution is measured at the surface of the sample by an infrared camera. The main drawback in radiometric imaging is the loss of
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Correction Quant. InfraRed Thermogr. J. (IF 1.231) Pub Date : 2019-08-12
(2020). Correction. Quantitative InfraRed Thermography Journal: Vol. 17, No. 4, pp. 287-287.
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Quality inspection of natural leather using non-destructive testing technique Quant. InfraRed Thermogr. J. (IF 1.231) Pub Date : 2019-08-07 S. Chudzik
ABSTRACT Results of a novel method of testing natural, tanned hides, in particular full grains, for both internal and external structural defects are presented. Such defects may occur while the animal is still alive or during the hide tanning and finishing processes. The method, still under development, uses a specially designed lamp to produce a thermal excitation impulse and an infrared camera to
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Thermal effusivity determination of carbon fibre-reinforced polymers by means of active thermography Quant. InfraRed Thermogr. J. (IF 1.231) Pub Date : 2019-08-07 J. Suchan; G. Hendorfer
We present a new imaging approach to determine porosity in carbon fibre-reinforced polymers by active thermography in the reflection mode. The infrared radiation is excited with help of a semiconductor laser. We use rectangular pulses for the excitation light – either single pulses or a sequence of a couple of pulses – and measure the succeeding temperature transients. These signals are transferred
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Predicting body fat mass by IR thermographic measurement of skin temperature: a novel multivariate model Quant. InfraRed Thermogr. J. (IF 1.231) Pub Date : 2019-08-07 G. Laffaye; V.V. Epishev; I.A. Tetin; Y.B. Korableva; K.A. Naumova; E.V. Antonenko; V.P. Vavilov
The purpose of this study has been to develop a multivariate model for predicting body fat mass in women by using the technique of infrared (IR) thermography. Sixty-nine healthy women, aged from 16 to 29, were investigated by using a body composition analyser and IR thermographic temperature measurement. The correlation analysis was performed to reveal the problem of multicollinearity. The technique
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Comparative study of active infrared thermography, ultrasonic laser vibrometry and laser ultrasonics in application to the inspection of graphite/epoxy composite parts Quant. InfraRed Thermogr. J. (IF 1.231) Pub Date : 2019-07-31 V.P. Vavilov; A.A. Karabutov; A.O. Chulkov; D.A. Derusova; A.I. Moskovchenko; E.B. Cherepetskaya; E.A. Mironova
ABSTRACT Three nondestructive testing techniques, namely, optically- and ultrasonically stimulated infrared thermography, ultrasonic laser vibrometry and laser ultrasonics, have been comparatively investigated in the inspection of a graphite-epoxy sample characterized by a complicated geometry to demonstrate advantages and drawbacks of each technique in the detection of different types of defects.
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Comparison between multi-frequency and multi-speed laser lock-in thermography methods for the evaluation of crack depths in metal Quant. InfraRed Thermogr. J. (IF 1.231) Pub Date : 2019-07-21 Christine Boué; Stéphane Holé
ABSTRACT Two original methods using lock-in thermography with a laser excitation are proposed for the estimation without contact of open crack depths in metal. The first uses a modulated punctual thermal source and is well suited for the study of complicated structures. In the second, a continuous moving thermal source allows to scan homogeneous structures. Each method relies on the heat diffusion
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Defect detection mechanisms with induction and conduction thermography: current flow and defect-specific warming Quant. InfraRed Thermogr. J. (IF 1.231) Pub Date : 2019-07-12 Johannes Vrana; Matthias Goldammer
Active thermography with electromagnetic excitation, is a reliable non-destructive evaluation method with a wide range of applications. It allows detecting inhomogeneities, like cracks, at or close to the surface of conductive components fast and reliable utilizing infrared imaging. Electric current can be used in two ways for thermography: In induction thermography a current is coupled to the component
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Process-integrated steel ladle monitoring, based on infrared imaging – a robust approach to avoid ladle breakout Quant. InfraRed Thermogr. J. (IF 1.231) Pub Date : 2019-07-12 Biswajit Chakraborty; Billol Kumar Sinha
Ladle breakout is a risky affair which is always present in steel making. The ladle breakout involves equipment damage and loss of production and sometimes loss of life. The present article describes the method of automatic detection of hotspot on the cold side of a ladle shell with the help of a group of infrared camera and subsequent processing of the infrared images in the LabVIEW platform. The
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Exploring deep learning networks for tumour segmentation in infrared images Quant. InfraRed Thermogr. J. (IF 1.231) Pub Date : 2019-06-11 Siva Teja Kakileti; Aman Dalmia; Geetha Manjunath
Infrared imaging has been used for detecting early-stage breast abnormalities. However, manual interpretation of these images is subjective and error prone. Automated analysis of thermal images using artificial intelligence increases the accuracy of detecting breast cancer and enables use in breast cancer screening programmes. A crucial step in automated analysis is tumour segmentation, which is the
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Numerical modelling and experimental evaluation of the composites using active infrared thermography with forced cooling Quant. InfraRed Thermogr. J. (IF 1.231) Pub Date : 2019-06-11 B. Szymanik; T. Chady; K. Gorący
Active infrared thermography is one of the methods of non-destructive testing widely used in modern industry. One of the basic advantages of this particular method is its versatility – it can be used for most of the materials regardless of their physical properties. Therefore, this technique is used for non-destructive testing of the composite structures, which lately became extremely important in
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Transient infrared thermography to characterise thermal properties of millimetre-sized hemp shiv Quant. InfraRed Thermogr. J. (IF 1.231) Pub Date : 2019-06-11 Thomas Pierre; Muriel Carin; Mickaël Courtois; Patrick Carré
This work deals with the thermal characterisation of a low conductivity material of millimetre-sized used mainly in building insulation, the hemp shiv. Experimentally, the samples are positioned in a stainless steel chamber, in which it is possible to control the environment. They are heated during a few seconds on one side, and an infrared camera measures the temperature field of the sample surface
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Thermal imaging as a tool for process modelling: application to a flight rotary kiln Quant. InfraRed Thermogr. J. (IF 1.231) Pub Date : 2019-05-16 L. Le Guen; F. Huchet
The rotary kiln is widely used for the thermal treatment of granular materials in various industries. A better understanding of the heat transfer phenomena, both inside and outside of the industrial rotary kiln, will lead to developing sustainable production techniques, such as materials recycling and heat waste recovery. The present paper summarises two complementary works based on infrared measurements
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Comparison of optimisation strategies for the improvement of depth detection capability of Pulse-Compression Thermography Quant. InfraRed Thermogr. J. (IF 1.231) Pub Date : 2019-05-16 H. Malekmohammadi; S. Laureti; P. Burrascano; M. Ricci
In Pulse-Compression Thermography, the impulse response of the Sample Under Test is retrieved pixelwise by applying a proper matched filter on the set of acquired thermal images obtained by stimulating the system with a heat source amplitude – modulated by a proper coded signal. Linear frequency-modulated chirp signals and binary codes are the most employed coded excitations, and to improve the detection
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3D temperature mapping of a ceramic shell mould in investment casting process via infrared thermography Quant. InfraRed Thermogr. J. (IF 1.231) Pub Date : 2019-05-07 Carlo Salvatore Greco; Gerardo Paolillo; Mattia Contino; Ciro Caramiello; Michele Di Foggia; Gennaro Cardone
Investment casting is a leading technique to manufacture very reliable components. The design and the optimization of this process are usually performed by simulation software and/or by means of simplified models based on heat transfer coefficients obtained by solving the inverse heat conduction problem (IHCP). Both methods require experimental tests, that involve temperature measurements, aiming at
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Quality management of laser cladding processes for additive manufacturing by new methods of visualisation and evaluation of thermographic data Quant. InfraRed Thermogr. J. (IF 1.231) Pub Date : 2019-05-07 Dan Ralf Wargulski; Torsten Nowak; Magnus Thiele; Henrik Dobbelstein; David Dillkötter; Johann Stoppok; Ralph Schacht; Mohamad Abo Ras
Additive manufacturing by laser cladding is a promising tool for rapid prototyping, construction of bionic structures and replacement part production. To ensure a constant quality of manufactured components and to shorten the development process between CAD model and suitable produced components quality management and process monitoring system is inevitable. Therefore, a system has been developed to
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Making long-wave infrared face recognition robust against image quality degradations Quant. InfraRed Thermogr. J. (IF 1.231) Pub Date : 2019-04-30 Camilo Gerardo Rodríguez-Pulecio, Hernán Darío Benítez-Restrepo, Alan Conrad Bovik
Face identification systems that operate on long wave infrared (LWIR) images are able to overcome some of the limitations of approaches based on visible images, such as dealing effectively with illumination variations. Nonetheless, distortions of perceptual image quality can impair the performance of thermal face recognition systems. Although the interaction between perceptual image quality and tasks
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Applicability analysis of IR thermography and discrete wavelet transform for technical conditions assessment of bridge elements Quant. InfraRed Thermogr. J. (IF 1.231) Pub Date : 2019-04-29 Leszek Różański, Krzysztof Ziopaja
Standard procedures for carrying out the inspection of the bridge or the assessment of its technical condition and suitability for use, rely on visual assessment made by the inspector and are in a certain part subjective. The main objective of the article is to analyze the applicability of IR as a tool to support the inspections of the structure and equipment elements of bridges. We are looking for
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Multi-view breast thermogram analysis by fusing texture features Quant. InfraRed Thermogr. J. (IF 1.231) Pub Date : 2019-04-29 Vijaya Madhavi, Christy Bobby Thomas
Breast cancer is the prevalent cancer type in women and thermography aids in premature detection by utilising ultra-sensitive infrared cameras. In this work, normal and abnormal thermograms are differentiated by extracting and fusing texture features from frontal and lateral views. Multi-view thermograms are pre-processed using anisotropic diffusion. The Region of Interest from axilla to lower breast
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Infrared micro-thermography of high-power AlInGaN LEDs using high emissivity (black) in IR and transparent in the visible spectral region coating Quant. InfraRed Thermogr. J. (IF 1.231) Pub Date : 2019-04-23 A. Aladov, A. Chernyakov, A. Zakgeim
For modern high-power LEDs, self-heating becomes a critical factor determining their functional characteristics and lifetime. For large-area LEDs with a complex structure, it is important to know not only the thermal resistance but also the detailed temperature distribution (temperature map) over the active area. We report a technique which can simplify and improve the Infrared (IR) micro-thermography
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Quantitative evaluation of eggs freshness using flash thermography Quant. InfraRed Thermogr. J. (IF 1.231) Pub Date : 2019-04-09 F. Freni; A. Quattrocchi; S. A. Piccolo; R. Montanini
The paper examines the topic of identifying eggs freshness through an original approach based on pulsed thermography. The proposed method relies on a short thermal stimulation performed by means of a xenon flash, which rises up the temperature of the egg of less than 1°C. The entire process requires about 1 s, thus providing an effective quality control tool for assessing the freshness of eggs intended
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Lock-in inductive thermography for surface crack detection in different metals Quant. InfraRed Thermogr. J. (IF 1.231) Pub Date : 2019-03-28 B. Oswald-Tranta
Inductive thermography is a non-destructive technique for detecting surface cracks in electrically conductive materials. The induced eddy currents and the heat diffusion are disturbed by surface cracks, which makes the defects visible in infrared images. In non-magnetic materials, with high electrical and thermal conductivity, a short heating pulse is necessary, otherwise the thermal signal diminishes
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Optimized dynamic line scanning thermography for aircraft structures Quant. InfraRed Thermogr. J. (IF 1.231) Pub Date : 2019-03-26 Jeroen Peeters, S. Verspeek, S. Sels, B. Bogaerts, G. Steenackers
In-line inspection of advanced components, remains a challenging task in industry. A methodology is discussed which uses numerical simulations to automatically determine the best set of experimental parameters to inspect the structure on defects using active thermography. The inspection is performed using an industrial conveyor belt or a robotic arm optimized using a numerical model of the defected
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Method of classification of global machine conditions based on spectral features of infrared images and classifiers fusion Quant. InfraRed Thermogr. J. (IF 1.231) Pub Date : 2019-03-19 Marek Fidali, Wojciech Jamrozik
This paper describes an original method of global machine condition assessment for infrared condition monitoring and diagnostics systems. This method integrates two approaches: the first is processing and analysis of infrared images in the frequency domain by the use of 2D Fourier transform and a set of F-image features, the second uses fusion of classification results obtained independently for F-image
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Study on methods to extract high contrast image in active dynamic thermography Quant. InfraRed Thermogr. J. (IF 1.231) Pub Date : 2019-03-19 Ashish Saxena, Vignesh Raman, E. Y. K. Ng
In the present study, image reconstruction methods are applied in active dynamic thermography (ADT) to visualize the superficial blood vessel with high contrast. ADT is performed on the left forearm of a human subject by applying cooling based external thermal stimulation. Both non-parametrized, viz. sequence image, sequentially subtracted image, Discrete Fourier Transformation (phase and amplitude
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Lock-in thermography for analyzing solar cells and failure analysis in other electronic components Quant. InfraRed Thermogr. J. (IF 1.231) Pub Date : 2019-02-22 Otwin Breitenstein, Steffen Sturm
Lock-in thermography (LIT) is a dynamic variant of infrared thermography, where local heat sources are periodically pulsed and amplitude and phase images of the surface temperature modulation are obtained. If used in electronic device testing, this method enables the localization of very weak local heat sources below the surface. This contribution reviews the basics and application of LIT for local
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Thermal Chladni plate experiments to reveal and estimate spatially dependent vibrothermal source Quant. InfraRed Thermogr. J. (IF 1.231) Pub Date : 2018-12-26 Samuel Rodriguez, Anissa Meziane, Christophe Pradère
In viscoelastic media, mechanical energy is partially converted to thermal energy. Thus, the vibration of a structure implies that there are thermal heat sources due to mechanical dissipation induced by acoustical vibration. The heat sources are directly linked to the stress and strain tensors. In the present work, a rectangular plate made of viscoelastic material is studied from both mechanical and