22 October 2010 Theoretical study on the cross sensitivity of fiber Bragg grating sensor affected by multi-external fields
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The applications of Fiber Bragg grating (FBG) sensors have been concerned considerably for many years. However, it is usually difficult to obtain an accurate result by single FBG in practical applications, since the phenomenon of cross sensitivity caused by the multi-external fields always exists. In the past, most of researchers presented their studies only on the cross sensitivity of two parameters including temperature and axial strain, temperature and transverse pressure, and so on. Actually, FBG sensors might be affected by temperature field, axial strain field and transverse pressure field simultaneously in some applications, but no previous analysis has been presented on the cross sensitivity caused by these three parameters. This work extends the previous works on the cross sensitivity of two parameters to that of three parameters in a FBG sensor. The sensing model of FBG in three external fields is deduced and analyzed theoretically from the perspective of its physical mechanism, through which the expression of the cross sensitivity function is obtained. Meanwhile, examples of different external physical factors and fiber parameters are considered for illustration purposes, and the cross sensitivity term is discussed by the numerical simulation. The simulated results show that the properties of cross sensitivity would change in a certain regulation with the changes of external effects and fiber parameters. Compared to the two-parameter analyzing method, this work makes a more comprehensive analysis to the research object. Some valuable suggestions about how to reduce the systematic error and improve the measurement accuracy are put forward as well.
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Binbin Luo, Binbin Luo, Mingfu Zhao, Mingfu Zhao, Saofei Wang, Saofei Wang, Xiaojun Zhou, Xiaojun Zhou, Nianbing Zhong, Nianbing Zhong, } "Theoretical study on the cross sensitivity of fiber Bragg grating sensor affected by multi-external fields", Proc. SPIE 7658, 5th International Symposium on Advanced Optical Manufacturing and Testing Technologies: Optoelectronic Materials and Devices for Detector, Imager, Display, and Energy Conversion Technology, 76581F (22 October 2010); doi: 10.1117/12.864114; https://doi.org/10.1117/12.864114

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