Wavelength-Division Multiplexing Fiber Bragg Grating Vibration Sensing Demodulation System

Fang Dong Zhu; Dong Sheng Zhang; Yong Xing Guo; Li Tong Li

doi:10.4028/www.scientific.net/AMR.718-720.636

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HomeAdvanced Materials ResearchAdvanced Materials Research Vols. 718-720Wavelength-Division Multiplexing Fiber Bragg...

Wavelength-Division Multiplexing Fiber Bragg Grating Vibration Sensing Demodulation System

Abstract:

A fiber Bragg grating (FBG) sensing network for vibration measurement is proposed and demonstrated in this paper. The light source of the described sensing technique is an erbium-doped fiber laser applying a 980-nm laser diode and a fiber Fabry-Perot tunable filter. The fiber laser has a 40nm tuning range, allowing many vibration sensors to be multiplexed on the same fiber. Reflected light wavelength shift of the FBG sensor caused by strain variation is converted to intensity deviation, which avoids a complex demodulation process. This sensing scheme can effectively increase the demodulation speed of sensing system up to 20 KHz. At least 20 FBGs can be multiplexed alone a fiber.

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Periodical:

Advanced Materials Research (Volumes 718-720)

Pages:

636-640

DOI:

https://doi.org/10.4028/www.scientific.net/AMR.718-720.636

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Online since:

July 2013

Authors:

Fang Dong Zhu, Dong Sheng Zhang, Yong Xing Guo, Li Tong Li

Keywords:

Demodulation Technique, Fiber Bragg Grating Sensor, Tunable Fiber Laser, Vibration Measurement, Wavelength Mutiplexing

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