14 February 2005 A low-cost multimode fiber Bragg grating sensor system
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Proceedings Volume 5634, Advanced Sensor Systems and Applications II; (2005); doi: 10.1117/12.576055
Event: Photonics Asia, 2004, Beijing, China
Abstract
A low-cost fiber optic sensor system based on multimode fiber and an LED light source is presented. A multimode fiber Bragg grating (MMFBG) element is used as a strain sensor. In a matched grating scheme, a MMFBG similar to the sensing one was used as a reference in the receiving unit. For detection of large wavelength shift we demonstrated the feasibility of MMFBG wavelength detection using a single mode fiber fused coupler edge filter. The high cost normally associated with wavelength interrogators for single mode fiber FBG sensors was overcome by the utilization of a low cost multimode fiber pigtailed LED light source. The multimode fiber sensing system has the potential of maintaining much of the advantages of its single mode FBG sensor system counterparts. The MMFBG sensing schemes could be used for short distance, high sensitivity, high speed, strain, temperature and acoustic sensing applications
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Tongyu Liu, Daorui Wang, Rasool Raenaei, Xianfeng Chen, Lin Zhang, Ian Bennion, "A low-cost multimode fiber Bragg grating sensor system", Proc. SPIE 5634, Advanced Sensor Systems and Applications II, (14 February 2005); doi: 10.1117/12.576055; https://doi.org/10.1117/12.576055
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KEYWORDS
Sensors

Fiber Bragg gratings

Multimode fibers

Light emitting diodes

Single mode fibers

Optical filters

Light sources

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