Laser & Optoelectronics Progress, Volume. 55, Issue 1, 10601(2018)
Real-Time Monitoring and Demodulation System of Fiber Bragg Grating Displacement Sensor
In order to establish a stable fiber grating sensor wavelength demodulation system, we use narrow band filter characteristic of tunable Fabry-Perot filter to make a linear scan of broadband light source, and use a high-precision reference grating placed in a thermostat to calibrate Fabry-Perot etalon, and to provide multiple wavelength reference points with the same interval and stable amplitude. The original data sequence is modified by the improved wavelet threshold denoising algorithm(using a new threshold function and a new threshold). We gain raw peak sequence by the core idea of the Gaussian fitting algorithm, and then do the secondary treatment, remove some invalid peaks, modify location of part peaks, and build a fiber grating displacement sensor real-time monitoring and demodulation system. Compared with spiral micrometer, accuracy of this system is about 0.25 mm.
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Yin Jianjing, Xu Xuemei, Ding Yipeng. Real-Time Monitoring and Demodulation System of Fiber Bragg Grating Displacement Sensor[J]. Laser & Optoelectronics Progress, 2018, 55(1): 10601
Category: Fiber Optics and Optical Communications
Received: Jul. 6, 2017
Accepted: --
Published Online: Sep. 10, 2018
The Author Email: Xuemei Xu (xuxuemei999@126.com)