| 分布式光纤拉曼温度传感器的对称解调 |
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| 引用本文： | 张利勋,廖云,欧中华,刘永智,代志勇,彭增寿,王大文.分布式光纤拉曼温度传感器的对称解调[J].光学学报,2007,27(3):400-403. |
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| 作者姓名： | 张利勋 廖云 欧中华 刘永智 代志勇 彭增寿 王大文 |
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| 作者单位： | 1. 电子科技大学光电信息学院,成都,610054
2. 中国电子科技集团第八研究所,淮南,230001 |
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| 摘 要： | 提出了一种用于分布式光纤拉曼温度传感器的对称解调新方案,采用瑞利散射光时域反射仪(OTDR)曲线解调光纤的反斯托克斯散射光时域反射仪曲线。首先将测量温度范围分成数段,用传统解调方法获取待测温度,然后判断该温度属于哪段内,最后用该对称的数段边界标定温度解调得到偶数个温度测量值,取平均值作为测量值。该方法提高了系统的测温精度和稳定性,系统的测温误差在±0．05℃内,空间分辨力1 m。实验结果与理论分析一致。
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| 关 键 词： | 光纤光学 拉曼背散射光 瑞利背散射光 分布式光纤 温度 |
| 文章编号： | 0253-2239（2007）03-0400-4 |
| 收稿时间： | 2006/1/17 |
| 修稿时间： | 2006-01-17 |
Symmetrical Demodulation of Distributed Fiber Raman Temperature Sensor |
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| Zhang Lixun,Liao Yun,Ou Zhonghua,Liu Yongzhi,Dai Zhiyong,Peng Zengshou,Wang Dawen.Symmetrical Demodulation of Distributed Fiber Raman Temperature Sensor[J].Acta Optica Sinica,2007,27(3):400-403. |
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| Authors: | Zhang Lixun Liao Yun Ou Zhonghua Liu Yongzhi Dai Zhiyong Peng Zengshou Wang Dawen |
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| Institution: | 1. School of Optoelectronic Information, University of Electronic Science and Technology of China, Chengdu 610054;2 The 8 th Institute, China Electronic Technology Group Corporation, Huainan 230001 |
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| Abstract: | A new type of symmetrical demodulation method is proposed for the distributed fiber Raman temperature sensor. The anti-Stokes scattering optical time domain reflectometer (OTDR) curves are demodulated by Rayleigh optical time domain reflectometer curves. Firstly, the measured temperature scope is divided into several regions; secondly, when the temperature is obtained by the traditional demodulation method, it will be located on the relative region; then the temperature is demodulated by the region's demarcated temperature, even-number values of temperature are obtained, and the average value is taken as the measured value. The temperature precision and stability of the sensor is improved, with temperature precision error in ±0.05 ℃ and spatial resolution of 1 m. The experimental results agree well with the theoretical ones. |
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| Keywords: | fiber optics Raman back scattering Rayleigh back scattering distributed optical fiber temperature |
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