11 October 2010 Research of FBG sensor with low frequency characteristics
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Abstract
The Fiber Bragg gating (FBG) can induce the changes of minute stress outside with the movements of Bragg refected wavelength. In addition, FBG is good at resisting interference, easy to pick off and transport and even liable to produce. In this paper, we analyzed the response processing of strain waves in different medium such as flexible stuff, agglutinate layers, sensors and especially Fiber Bragg gating strain sensors, learned the dynamic characteristics of strain sensors in low frequency, and explored the application of FBG strain sensor in low frequency vibration measurement. By analyzing the error caused by the amplitude (average value ) of FBG which is about sine wave and which is lower than the true amplitude, we gained the reference formula for design and application of the FBG strain sensor with error range 1.6%~0.4%. Furthermore, we got the spread time and speed from the strain wave to bare fiber in theory. Because of the time delay, we used beton materials for example to calculate the measurable frequency of strain sensor for step strain wave. As a result, we know that the FBG strain sensors have advantages in the structure of stress and strain for high precision, quasi-distributed digital measure, and the research results also show a guiding meaning in engineering practice.
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Xin-cun Gao, Xin-cun Gao, Pei-qi Han, Pei-qi Han, Tian-shan Liu, Tian-shan Liu, Xi Han, Xi Han, } "Research of FBG sensor with low frequency characteristics", Proc. SPIE 7656, 5th International Symposium on Advanced Optical Manufacturing and Testing Technologies: Optical Test and Measurement Technology and Equipment, 765646 (11 October 2010); doi: 10.1117/12.865206; https://doi.org/10.1117/12.865206
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