| 谷 行,白 清,王清琳,闫 伟,李靖升,王 宇,靳宝全.基于窗函数优化的布里渊光时域反射
仪测温精度提升研究[J].电子测量与仪器学报,2020,34(1):25-31 |
| 基于窗函数优化的布里渊光时域反射
仪测温精度提升研究 |
| Research on accuracy improvement of Brillouin optical time domain reflectometer temperature measurement based on window function optimization |
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| DOI： |
| 中文关键词: 布里渊光时域反射仪 短时傅里叶变换 频率泄漏 窗函数 运算点数 |
| 英文关键词:Brillouin optical time domain reflectometer short time Fourier transform frequency leakage window function operation point |
| 基金项目:国家自然科学基金面上项目(61975142)、山西省重点研发计划（一般）社会发展项目(201703D321034)、山西省煤层气联合研究基金(2015012005,2016012011)、山西省自然科学基金(201601D021068)资助项目 |
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| Author | Institution |
| Gu Hang | 1.Key Lab of Advanced Transducers and Intelligent Control System, Ministry of Education and Shanxi Province, Taiyuan University of Technology |
| Bai Qing | 1.Key Lab of Advanced Transducers and Intelligent Control System, Ministry of Education and Shanxi Province, Taiyuan University of Technology |
| Wang Qinglin | 1.Key Lab of Advanced Transducers and Intelligent Control System, Ministry of Education and Shanxi Province, Taiyuan University of Technology |
| Yan Wei | 1.Key Lab of Advanced Transducers and Intelligent Control System, Ministry of Education and Shanxi Province, Taiyuan University of Technology |
| Li Jinsheng | 1.Key Lab of Advanced Transducers and Intelligent Control System, Ministry of Education and Shanxi Province, Taiyuan University of Technology |
| Wang Yu | 1.Key Lab of Advanced Transducers and Intelligent Control System, Ministry of Education and Shanxi Province, Taiyuan University of Technology |
| Jin Baoquan | 1.Key Lab of Advanced Transducers and Intelligent Control System, Ministry of Education and Shanxi Province, Taiyuan University of Technology，2.Coal and Coal Methane Simultaneous Extraction
National Key Laboratory |
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| 中文摘要: |
| 基于短时傅里叶变换（short time Fourier transform, STFT）算法的布里渊光时域反射仪（Brillouin optical time domain reflectometer, BOTDR）可实现快速温度检测，但存在频率泄漏和栅栏效应，导致测温精度较差。针对上述问题，在搭建STFT BOTDR测温系统的基础上，通过窗函数和运算点数优化，抑制了STFT算法所引发的频率泄漏，实现了STFT BOTDR测温精度提升。实验中设置时域窗口长度为16 m，窗口滑动步进为05 m，对比了不同窗函数与运算点数下的测量精度。结果表明，当采用汉宁窗且运算点数为1 024时，可实现96 km光纤末端温度变化的准确检测与定位，误差为1012℃；测量精度为±25 MHz。而未采用窗函数时测量精度为±125 MHz，无法实现温度变化准确测量。研究结果为STFT BOTDR温度检测系统精度优化提供了借鉴。 |
| 英文摘要: |
| Brillouin optical time domain relectometer (BOTDR) based on short time Fourier transform (STFT) algorithm can achieve fast temperature detection. However, there are frequency leakage and fence effects, resulting in poor temperature measurement accuracy. In view of the above problems, this paper builds on the STFT BOTDR temperature measurement system. Through the optimization of window function and operation point number, the frequency leakage caused by STFT algorithm is suppressed, and the accuracy of STFT BOTDR temperature measurement is improved. In the experiment, the time domain window length is set to 16 m, and the window sliding step is 05 m, which compares the measurement accuracy under different window functions and operation points. The results show that when the Hanning window is used and the number of calculation points is 1 024, the accurate detection and positioning of the temperature change of the fiber end of 96 km can be realized with an error of 1012℃. The measurement accuracy is ±25 MHz. When the window function is not used, the measurement accuracy is ±125 MHz, and accurate measurement of temperature change cannot be achieved. The research results provide a reference for the optimization of the accuracy of the STFT BOTDR temperature detection system. |
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