Prof. Xincun Gao Profile

Prof. Xincun Gao

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Proceedings Article | 12 October 2010 Paper

Research of FBG sensor with low frequency characteristics

Xin-cun Gao, Pei-qi Han, Tian-shan Liu, Xi Han

Proceedings Volume 7656, 765646 (2010) https://doi.org/10.1117/12.865206

KEYWORDS: Fiber Bragg gratings, Sensors, Raster graphics, Epoxies, Error analysis, Precision measurement, Bridges, Buildings, Refractive index, Medium wave

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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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