光谱学与光谱分析 |
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Granary Temperature Measurement Network Based on Chirped FBG |
LIU Zhi-chao1, YANG Jin-hua1, ZHANG Liu2*, WANG Gao3 |
1. School of Optoelectronic Information, Changchun University of Science and Technology, Changchun 130000, China 2. Jilin University, Instrumentation and Electrical Engineering, Changchun 130000, China 3. National Key Laboratory for Electronic Measurement Technology, North University of China, Taiyuan 030051, China |
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Abstract In conventional optical fiber grating temperature measuring system, it can be loaded into a small number of fibers grating probe. At the same time, the intensity of back waves is relatively weak, and its multiplexing capability is poor. In order to solve these problems, temperature measurement system was designed based on chirped Fiber Bragg Grating. Its purpose is to obtain large-scale, multi-point temperature measurement data. The bandwidth of back waves was improved by chirp modulation techniques, so that available processing power of signal was increased, and the number of the chirped FBG probe in one fiber was greatly increased. Grating period expression was derived in chirp modulation, and modulation method and the wavelength range was provided. In the experiment, LPT-102 broadband light source and the FP optical fiber demodulator were used, and the modulation bandwidth of the system was from 1 535.0 to 1 555.0 nm. It used the WR-201 type temperature sensor as calibrated detector. Experimental results show that when the temperature changed by 1 ℃ from 20~60 ℃, the test temperature error would be closed with traditional Fiber Bragg Grating probe and chirped Fiber Bragg Grating probe, and they both meet the design requirements. In contrast, the wavelength shift data of chirped FBG was more monotone linear than the characteristic FBG, so its data was more stable. Meanwhile, in one fiber, the number of probes in the chirped FBG system was greatly more than the Uniform FBG system. In the original FBG system, without increasing the number of optical fiber or reduced the temperature measurement accuracy, design requirements for increase with the number of probe points in the system was achieved.
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Received: 2015-08-03
Accepted: 2015-12-21
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Corresponding Authors:
ZHANG Liu
E-mail: s20070384@163.com
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[1] Chong S S, Chong W Y. Optics & Laser Technology,2012, 44(2):821. [2] YANG Shu-lian, SHEN Jin, LI Tian-ze(杨淑连, 申 晋, 李田泽). High Power Laser and Particle Beams(强激光与粒子束),2015, 27(6): 061014-1. [3] ZHANG Fei, WANG Su-mei, LIU Da(张 飞,王素梅,刘 达). Optical Technique(光学技术), 2015, 41(1): 3. [4] Wada D, Murayama H, Igawa H. Smart Materials and Structures,2011, 20(8): 085028. [5] Kenneth Hill, Gerald Meltz. Journal of Lightwave Technology, 1997, 15(8): 1263. [6] XIAO Jin-liang, PU Tao, CHEN Da-lei(肖进良, 蒲 涛, 陈大雷). Journal of Optoelectronics·Laser(光电子·激光), 2015, 26(3): 480. [7] LIANG Li-li, LIU Ming-sheng, LI Yan(梁丽丽, 刘明生, 李 燕). Infrared and Laser Engineering(红外与激光工程), 2015, 44(3): 1020. [8] WANG Gui-na, CENG Jie, MU Hao(王桂娜, 曾 捷, 穆 昊). Lsaer & Infrared,2015, 45(1): 66. [9] CAO Jing-jing, HU Liao-lin, ZHAO Rui(曹京京, 胡辽林, 赵 瑞). Chinese Journal of Sensors and Actuators(传感技术学报), 2015, 28(4): 521. [10] YANG Gang, XU Guo-liang, TU Guo-jie(杨 刚, 许国良, 涂郭结). Chinese Journal of Lasers(中国激光), 2015, 42(4): 0405110-1. [11] LI Zhi-zhong, XU Zhong-liang, LI Hai-tao(李智忠, 许忠良, 李海涛). Acta Photonica Sinica(光子学报), 2014, 43(6): 0606004-1. [12] LIU Zhi-chao, YANG Jin-hua, WANG Gao(刘智超, 杨进华,王 高). Spectroscopy and Spectral Analysis(光谱学与光谱分析), 2014,34(7): 1793. |
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