| COTDR散射信号相关特性的研究 |
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| 引用本文： | 杨莉,杨志,刘玮,李永倩.COTDR散射信号相关特性的研究[J].光通信研究,2012,38(4):7-9. |
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| 作者姓名： | 杨莉 杨志 刘玮 李永倩 |
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| 作者单位： | 华北电力大学,河北保定,071003 |
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| 基金项目： | 华北电力大学校内科研基金资助项目，河北省自然科学基金资助项目 |
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| 摘 要： | 在基于相干光时域反射计的分布式光纤温度与应变传感原理的基础上,对不同频率入射光的后向瑞利散射信号在频域上的相关特性进行了分析。用后向瑞利散射的离散模型来说明后向瑞利散射信号在传感光纤中传播的原理,用MATLAB软件对COTDR(相干光时域反射)过程进行了仿真和分析,对不同脉冲宽度的入射信号的功率及相关特性进行了分析研究。结果表明,输入脉冲宽度与频域相关带宽成反比,即传感位置精度与温度或应变精度成反比。
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| 关 键 词： | 分布式光纤传感 相干光时域反射 瑞利散射 |
| 收稿时间： | 2012/3/13 |
Research on the correlation characteristics of COTDR scattering signals |
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| Yang Li
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Yang Zhi
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Liu Wei
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Li Yongqian.Research on the correlation characteristics of COTDR scattering signals[J].Study on Optical Communications,2012,38(4):7-9. |
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| Authors: | Yang Li Yang Zhi Liu Wei Li Yongqian |
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| Affiliation: | (North China Electric Power University,Baoding 071003,China) |
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| Abstract: | In this paper, we analyze the correlation characteristics of Rayleigh backscattering signals of incident light with different frequencies in the frequency domain on the basis of the distributed fiber temperature and the strain sensing principle of the Coherent Optical Time-Domain Reflectometer (COTDR). Then, we explain the transmission principle of the Rayleigh backscattering signals in sensing fibers with a discrete Rayleigh backscattering model, simulate and analyze the COTDR process and analyze the power and correlation characteristics of incident signals with different pulse widths by using MATLAB software. The results show that the input pulse width is inversely proportional to the correlation width in frequency domain, i.e. the precision of the sensing position is inversely proportional to temperature or strain precision. |
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| Keywords: | distributed optical fiber sensing COTDR Rayleigh backscattering |
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