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Performance of transmitted optical fiber hydrogen sensing system based on orthogonal demodulation method
Optics Communications ( IF 2.4 ) Pub Date : 2021-08-24 , DOI: 10.1016/j.optcom.2021.127401
Shuangjiao Wei 1 , Zhenglan Bian 1 , Xingquan Wang 1 , Guilin Zhang 2 , Liang Xue 1 , Anduo Hu 1 , Fenghong Chu 1
Affiliation  

A transmitted optical fiber sensing system based on orthogonal demodulation algorithm is used for hydrogen detection in this paper. WO3/Pt fabricated by sol–gel method was used as sensing material. WO3 film reacts with hydrogen by the catalysis of Pt and refractive index of the sensing film changed, by measuring the transmitted optical power the concentration of hydrogen can be detected. Orthogonal demodulation algorithm was used to demodulate the weak transmitted optical intensity signals. Compared with the traditional ratio-type transmitted optical fiber hydrogen sensing system, the noise reduced by 28 times. The limit of detection is 495ppm and with good repeatability and stability. In order to improve the sensitivity of the system, three pieces of sensing film were used to increase the interaction length of the sensing material with hydrogen and the sensitivity increased by 2.592 times. With the orthogonal demodulated technique and multi pieces of sensing film, high sensitivity, fast response and low cost hydrogen sensing system was implemented and is very promising for the monitoring of hydrogen leakage in the field of hydrogen production, transportation, and storage.



中文翻译:

基于正交解调法的传输光纤氢传感系统性能

本文采用基于正交解调算法的传输光纤传感系统进行氢气检测。通过溶胶-凝胶法制备的WO 3 /Pt用作传感材料。WO 3薄膜在铂的催化作用下与氢发生反应,传感薄膜的折射率发生变化,通过测量透射光功率可以检测氢的浓度。采用正交解调算法对弱传输光强信号进行解调。与传统的比率式传输光纤氢传感系统相比,噪声降低了28倍。检测限为495ppm,具有良好的重复性和稳定性。为了提高系统的灵敏度,采用了三片传感膜,增加了传感材料与氢的相互作用长度,灵敏度提高了2.592倍。采用正交解调技术和多片传感膜,灵敏度高,

更新日期:2021-09-15
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