Abstract
We consider ultrasound tomography of concrete building structures containing defects arranged at large angles to the antenna array (AA). In oblique sounding of such building units made of complex-structured concrete, the influence of pattern noise (PN) increases due to the effect of negative cross-correlation of PN signals on adjacent AA transducers. It has been shown that the optimum (providing the maximum signal–to–pattern-noise ratio) antenna-array pitch for oblique sounding should be (0.35–0.4)\(\lambda \). It is shown that, in the tomography of inside corners at the junction of two walls, it is advisable to use either two separate antenna arrays, designed for oblique sounding of building structures, located on different sides of a corner wall junction or a single antenna array consisting of two linear AAs combined into one antenna in order to more efficiently extract useful signals from PN and increase the angular resolution.
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REFERENCES
Shevaldykin, V.G., Kozlov, V.N., and Samokrutov, A.A., Inspection of concrete by ultrasonic pulse-echo tomograph with dry contact, in 7th Eur. Conf. Nondestr. Test., Copengagen, May 26–29, 1998.
Schickert, M., Towards SAFT-imaging in ultrasonic inspection of concrete, in Int. Symp. Nondestr. Test. Civ. Eng. (NDT-CE), September 26–28, 1995, pp. 411–418.
Kozlov, V.N., Samokrutov, A.A., and Shevaldykin, V.G., RF patent No. 2082163. Ultrasonic low-frequency transducer, Byull. Izobret., 1997, no. 17.
Kartashev, V.G. and Kachanov, V.K., Optimal isolation of signals against the background of structural noise in ultrasonic flaw detection, Defektoskopiya, 1992, no. 7, pp. 14–24.
Kachanov, V.K., Kartashev, V.G., Sokolov, I.V., and Turkin, M.V., Problems of extracting ultrasonic signals from structural noise during inspection of articles produced from materials with complex structures, Russ. J. Nondestr. Test., 2007, vol. 43, no. 9, pp. 619–630.
Kachanov, V.K., Kartashev, V.G., Sokolov, I.V., Voronkova, L.V., and Shalimova, E.V., Strukturnyi shum v ul’trazvukovoi defektoskopii (Structure-Borne Noise in Ultrasonic Flaw Detection), Moscow: Moscow Power Eng. Inst., 2016.
Kartashev, V.G., Kachanov, V.K., Sokolov, I.V., Voronkova, L.V., and Kontsov, R.V., Pattern-noise in ultrasonic inspection of articles made of complexly structured materials, Russ. J. Nondestr. Test., 2018, vol. 54, no. 1, pp. 17–30.
Kartashev, V.G., Kachanov, V.K., Sokolov, I.V., Kontsov, R.V., and Fadin, A.S., Choosing phased array pitch in ultrasonic tomography of materials with inhomogeneous structure, Russ. J. Nondestr. Test., 2018, vol. 54, no. 4, pp. 223–231.
Kartashev, V.G., Kachanov, V.K., Sokolov, I.V., et al., Selecting the pitch of a double crystal transducer in ultrasonic testing of products made of complex structured materials with a nonplanar surface, Russ. J. Nondestr. Test., 2019, vol. 55, no. 12, pp. 887–897.
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This work was supported by the Russian Foundation for Basic Research, project no. 19-38-90223.
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Translated by V. Potapchouck
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Kachanov, V.K., Kartashev, V.G., Sokolov, I.V. et al. Ultrasonic Tomograph of Concrete Building Structures with Lateral Signal Radiation. Russ J Nondestruct Test 56, 110–118 (2020). https://doi.org/10.1134/S1061830920020047
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DOI: https://doi.org/10.1134/S1061830920020047