Acta Photonica Sinica, Volume. 44, Issue 11, 1106004(2015)
Simultaneous Measurement of Curvature and Temperature Based on Optical Fiber Sensor
An optical fiber sensor based on a fiber Bragg grating and Mach-Zehnder interferometer was proposed and experimentally demonstrated for the measurement of curvature and temperature simultaneously. The sensor head is formed by combining a fiber Bragg grating with an all-fiber Mach-Zehnder interferometer which consists of two cascaded peanut-shape structures. Experimental results show that the interference peaks of the Mach-Zehnder interferometer transmission spectrum and the resonance peaks of the fiber Bragg grating transmission spectrum have a different sensitivity to curvature and temperature change,so that a matrix can be used to realize the simultaneous measurement of the curvature and temperature. Curvature sensitivity of the Mach-Zehnder interferometer is -27.58 nm/m-1 while fiber Bragg grating is not sensitive to the curvature change. Temperature sensitivity of the Mach-Zehnder interferometer and fiber Bragg grating in the experiment is 0.038 69 nm/℃ and 0.012 17 nm/℃,respectively. This proposed sensor employs all-fiber structure and the fiber Bragg grating is inserted between two cascaded peanut-shape structures,so it is compact and easy to make.
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WANG Dong-yuan, SUN Ming-ming, JIN Yong-xing, WANG Jian-feng, DONG Xin-yong. Simultaneous Measurement of Curvature and Temperature Based on Optical Fiber Sensor[J]. Acta Photonica Sinica, 2015, 44(11): 1106004
Received: Jul. 2, 2015
Accepted: --
Published Online: Dec. 18, 2015
The Author Email: Dong-yuan WANG (jzjswq@126.com)