Volume 44 Issue 3
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Liang Lili, Liu Mingsheng, Li Yan, Li Guoyu, Yang Kang. Solutions of strain and temperature cross-sensitivity of long period fiber grating temperature sensing[J]. Infrared and Laser Engineering, 2015, 44(3): 1020-1023.
Citation: Liang Lili, Liu Mingsheng, Li Yan, Li Guoyu, Yang Kang. Solutions of strain and temperature cross-sensitivity of long period fiber grating temperature sensing[J]. Infrared and Laser Engineering, 2015, 44(3): 1020-1023.

Solutions of strain and temperature cross-sensitivity of long period fiber grating temperature sensing

  • Received Date: 2014-07-05
  • Rev Recd Date: 2014-08-15
  • Long period fiber grating is transmission spectrum grating,which is fiber core basic model coupling with cladding modes, and resonance wavelength and amplitude of long period fiber grating is very sensitive to the change of external environment, long period fiber grating has better sensing properties than traditional FBG in temperature, stress, bending, distortion, lateral load, refractive index, and so on. Because the long period fiber grating was sensitive to two or more parameters, when optical fiber grating for sensing measurement, it was difficult to distinguish the change of the measured caused by the various parameters respectively, and cross-sensitivity problem of long period fiber grating was more serious than that of the fiber Bragg grating. The cross-sensitivity was the key problem of fiber grating sensors. Based on analysis of the current typical ideas and solutions, one idea and solution of relation was proposed in this paper, and solves cross-sensitivity between stress and temperature in the long period fiber grating temperature sensing measurement. This idea makes full use of the cross-sensitivity phenomenon of the temperature and strain of LPFG and turns the negative interference of the strain on the temperature to positive sensitization.
  • [1] Xu M G, Archambault J L, Reekie L, et al. Discrimination between strain and temperature effects using dual wavelength fiber grating sensors[J]. Electron Lett, 1994, 30(13): 1085-1087.
    [2]
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    [4] Patrick H J, Williams G M, Kersey A D, et al. Hybrid fiber Bragg grating P long period fiber grating sensor for strain P temperature discrimination[J]. IEEE Photo Tech Lett, 1996, 8(9):1223-1225.
    [5]
    [6] James S W, Dockney M L, Tatam R P. Simultaneous independent temperature and strain measurement using in fiber grating sensors [J]. Electron Lett, 1996, 32(12): 1133-1134.
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    [8] Liu Xingchen, Rao Yunjiang, Ran Zengling, et al. Temperature and strain characteristic of Long Period Fiber Grating(LPFG) induced by high frequency CO2 laser pulses[J]. Journal of Henan Normal University(Natural Science Edition), 2011, 39(3): 43-46. (in Chinese) 刘兴晨, 饶云江, 冉增令, 等. 高频CO2激光脉冲写入的掺硼LPFG温度应变特性[J].河南师范大学学报(自然科学版), 2011, 39(3): 43-46.
    [9] Rao Yunjiang, Wang Yiping, Ran Zengling, et al. Simultaneous measurement of transverse load and temperature using a single long-period fiber grating element[J]. Chinese Jouranal of Lasers, 2003, 30(12): 1116-1120. (in Chinese) 饶云江, 王义平, 冉曾令, 等. 单个长周期光纤光栅实现横向负载和温度的同时测量[J]. 中国激光, 2003, 30(12): 1116-1120.
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    [11] Huang Yonglin, Li Jie, Kai Guiyun, et al. Temperature compensation package for fiber Bragg gratings[J]. Microwave and Optical Technology Letters, 2003, 39(1): 70-72.
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    [13] Zhou Bing, Liang Dakai, Wang Yan. A method of temperature compensation for long-period fiber grating[J].Piezoelectric Acoustooptics, 2008, 30(2): 159-160. (in Chinese) 周兵, 梁大开, 王彦. 长周期光纤光栅的一种温度补偿方法[J]. 压电与声光, 2008, 30(2): 159-160.
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    [15] Liang Lili, Liu Mingsheng, Li Yan, et al. The method of one-time writing LPFG using high frequency CO2 laser[J]. Laser Optoelectronics Progress, 2013, 50(9): 090503. (in Chinese) 梁丽丽, 刘明生, 李燕, 等. 使用高频CO2激光器一次写入长周期光纤光栅的方法[J].激光与光电子学进展, 2013, 50(9): 090503.
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Solutions of strain and temperature cross-sensitivity of long period fiber grating temperature sensing

  • 1. School of Information Engineering,Hebei University of Technology,Tianjin 300401,China;
  • 2. Shijiazhuang Railway Vocational and Technical College,Shijiazhuang 050041,China;
  • 3. Institute of Information Technology,Handan Colloge,Handan 056005,China

Abstract: Long period fiber grating is transmission spectrum grating,which is fiber core basic model coupling with cladding modes, and resonance wavelength and amplitude of long period fiber grating is very sensitive to the change of external environment, long period fiber grating has better sensing properties than traditional FBG in temperature, stress, bending, distortion, lateral load, refractive index, and so on. Because the long period fiber grating was sensitive to two or more parameters, when optical fiber grating for sensing measurement, it was difficult to distinguish the change of the measured caused by the various parameters respectively, and cross-sensitivity problem of long period fiber grating was more serious than that of the fiber Bragg grating. The cross-sensitivity was the key problem of fiber grating sensors. Based on analysis of the current typical ideas and solutions, one idea and solution of relation was proposed in this paper, and solves cross-sensitivity between stress and temperature in the long period fiber grating temperature sensing measurement. This idea makes full use of the cross-sensitivity phenomenon of the temperature and strain of LPFG and turns the negative interference of the strain on the temperature to positive sensitization.

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