Mr. Chong Liu Profile

Chong Liu

at Huazhong Univ. of Science and Technology

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Proceedings Article | 23 February 2009 Paper

Study on strain properties for fiber Bragg grating sensor

Chong Liu, Shaomin Li

Proceedings Volume 7278, 72780F (2009) https://doi.org/10.1117/12.820783

KEYWORDS: Fiber Bragg gratings, Sensors, Demodulation, Light sources, Fiber optics sensors, Fiber optics, Signal processing, Sensing systems, Fiber optic communications, Refractive index

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As a new-type sensing element, fiber grating has gained abroad attention from its appearance and achieved high-speed development in the last 20 years. With the development of fiber grating technology, study on the application of Fiber Bragg Grating (FBG) sensor has got more recognition. In this paper the fiber grating sensing system consists of four parts: light-source, fiber grating sensor, demodulation circuit and signal process circuit. The properties of FBG, the demodulation technology of the sensor, and the network technology are studied experimentally and theoretically. The following are the main contents: (1) The sensing characteristics of FBG are analyzed, with the result of a linear relationship between the central wavelength of FBG and the temperature strain. Meanwhile, the temperature and strain sensing experiment results agree with the theoretical analysis. (2) The demodulation method of fiber grating is the key technology of fiber grating sensor. The main demodulation method includes: filtering method, interference method, tunable light source scanning method. We can use anyone of them to detect FBG's central wavelength. (3) The demodulation method based on tunable light source is used, and a fiber grating sensor system based on this method is developed. Tuning the light source until its output matches the central wavelength of FBG, the peak value will display, and then the temperature or strain could be known according to this wavelength.

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