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In a distributed fiber optic temperature sensing system, the intensity of Raman Stokes backscattering light serving as reference light increases with the increase of temperature, leading to measurement errors in the system. A novel method of dynamically calibrating Raman Stokes backscattering light intensity is proposed to improve temperature accuracy for distributed fiber optic temperature sensors. According to the real-time Stokes intensity distribution in the reference fiber, Stokes intensity curve of the whole fiber at a reference temperature is simulated, and the temperature response of Stokes light is corrected. The ratio of Raman anti-Stokes light intensity to the calculated Stokes light intensity is used to demodulate temperature along the fiber. The experimental results indicate that the temperature accuracy of the distributed optical fiber temperature sensor system after making the Stokes optical dynamic calibration is increased up to 4.3 ℃ compared with that from the conventional method. And the accuracy of temperature measurement is improved by 8.9 ℃ when combined with Rayleigh noise suppression method. This study provides a new solution for a distributed fiber optic temperature sensor system to monitor high temperature environment temperature.
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Keywords:
- distributed fiber optic temperature sensor /
- Raman Stokes backscattering light /
- calibration /
- temperature accuracy
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图 1 DTS系统的实验装置图
Figure 1. The experimental setup of the DTS system.
图 2 (a) 光纤中的背向散射光分布; (b) 不同温度下归一化的散射光强度图
Figure 2. (a) Backscattered lights distribution along the fiber; (b) variation of normalized Raman signals with temperature.
图 3 原始的斯托克斯光信号和指数拟合的斯托克斯光信号
Figure 3. Original Stokes signals and exponential fits.
图 4 不同被测温度对应的测量结果 (a) 温度测量值; (b) 温度测量误差
Figure 4. Demodulated temperature versus different measured temperature: (a) Measured temperature; (b) temperature error.
图 5 DTS系统的测温结果 (a) 斯托克斯光动态校准前后消除瑞利噪声的测量温度; (b)斯托克斯光校准前后消除瑞利噪声的测温误差
Figure 5. Temperature measurement results in DTS system: (a) Measurement temperature results without Rayleigh noise before and after Stokes light dynamic calibration; (b) temperature error without Rayleigh noise before and after Stokes light dynamic calibration.
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[1] Ren L, Jiang T, Jia Z G, Li D S, Yuan C L, Li H N 2018 Measurement 122 57
Google Scholar
[2] Francesca D D, Girard S, Planes I, et al. 2017 IEEE Trans. Nucl. Sci. 64 54
Google Scholar
[3] Liu Y P, Yin J Y, Fan X Z, Wang B W 2019 Appl. Opt. 58 7962
Google Scholar
[4] Yan B Q, Li J, Zhang M J, Zhang J Z, Qiao L J, Wang T 2019 Sensors 19 2320
Google Scholar
[5] Yilmaz G, Karlik S E 2006 Sensor Actuat A-Phys. 125 148
Google Scholar
[6] 饶云江 2017 66 074207
Google Scholar
Rao Y J 2017 Acta Phys. Sin. 66 074207
Google Scholar
[7] 刘铁根, 于哲, 江俊峰, 刘琨, 张学智, 丁振扬, 王双, 胡浩丰, 韩群, 张红霞, 李志宏 2017 66 070705
Google Scholar
Liu T G, Yu Z, Jiang J F, Liu K, Zhang X Z, Ding Z Y, Wang S, Hu H F, Han Q, Zhang H X, Li H Z 2017 Acta Phys. Sin. 66 070705
Google Scholar
[8] 张明江, 李健, 刘毅, 张建忠, 李云亭, 黄琦, 刘瑞霞, 杨帅军 2017 中国激光 44 0306002
Google Scholar
Zhang M J, Li J, Liu Y, Zhang J Z, Li Y T, Huang Q, Liu R X, Yang S J 2017 Chin. Laser 44 0306002
Google Scholar
[9] Wang W J, Chang J, Lv G P, Wang Z L, Liu Z, Luo S, Jiang S, Liu X Z, Liu X H, Liu Y N 2013 Photonic Sens. 3 256
Google Scholar
[10] 杨睿, 李小彦, 高翔 2015 光子学报 44 1006006
Google Scholar
Yang R, Li X Y, Gao X 2015 Acta Photon. Sin. 44 1006006
Google Scholar
[11] Sun B N, Chang J, Lian J, Wang Z L, Lv G P, Liu X Z, Wang W J, Zhou S, Wei W, Jiang S, Liu Y N, Luo S, Lu X H, Liu Z, Zhang S S 2013 Opt. Commun. 306 117
Google Scholar
[12] Yan B Q, Li J, Zhang M J, Xu Y, Yu T, Zhang J Z, Qiao L J, Wang T 2020 Appl. Opt. 59 22
Google Scholar
[13] Wang Z L, Chang J, Zhang S S, Luo S, Jia C W, Jiang S, Sun B N, Liu Y N, Wei W, Liu X H, Lv G P 2015 Optik 126 270
Google Scholar
[14] Wang Z L, Chang J, Zhang S S, Sun B N, Jiang S, Luo S, Jia C W, Liu Y N, Liu X H, Lv G P, Liu X Z 2014 Opt. Quant. Electron. 46 821
Google Scholar
[15] Li J, Li Y T, Zhang M J, Liu Y, Zhang J J, Yan B Q, Wang D, Jin B Q 2017 Photonic Sens. 8 103
Google Scholar
[16] 李云亭, 张明江, 刘毅, 张建忠 2017 光电工程 34 20
Google Scholar
Li Y T, Zhang M J, Liu Y, Zhang J Z 2017 Optoelectron. Eng. 34 20
Google Scholar
[17] 汤玉泉, 孙苗, 李俊, 杨爽, Brian Culshaw, 董凤忠 2015 光子学报 44 112
Google Scholar
Tang Y Q, Sun M, Li J, Yang S, Brian C, Dong F Z 2015 Acta Photon. Sin. 44 112
Google Scholar
[18] Wang Z L, Chang J, Zhang S S, Luo S, Jia C W, Jiang S, Sun B N, Liu Y N, Liu X H, Lv G P 2015 IEEE Sens. J. 15 1061
Google Scholar
[19] Suh K, Lee C 2008 Opt. Lett. 33 1845
Google Scholar
[20] Wang Z L, Zhang S S, Chang J, Lv G P, Wang W J, Jiang S, Liu X Z, Liu X H, Luo S, Sun B N, Liu Y N 2013 Opt. Quant. Electron. 45 1087
Google Scholar
[21] 孙苗, 汤玉泉, 杨爽, 李俊, Brian Culshaw, 董凤忠 2015 光电子·激光 26 2070
Google Scholar
Sun M, Tang Y Q, Yang S, Li J, Brain C, Dong F Z 2015 J. Optoelectron. Laser 26 2070
Google Scholar
[22] Wang Z, Sun X H, Xue Q, Wang Y L, Qi Y L, Wang X S 2017 Opt. Laser Technol. 93 224
Google Scholar
[23] 马天兵, 訾保威, 郭永存, 凌六一, 黄友锐, 贾晓芬 2020 69 030701
Google Scholar
Ma T B, Zi B W, Guo Y C, Ling L Y, Huang Y R, Jia X F 2020 Acta Phys. Sin. 69 030701
Google Scholar
[24] Chakraborty A L, Sharma R K, Saxena M K, Kher S 2007 Opt. Commun. 274 396
Google Scholar
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