边缘检测技术在分布式光纤传感中的应用

万生鹏; 何赛灵; 胡建东; 高益庆

中国激光, 2005, 32 (5): 673, 网络出版: 2006-06-01

边缘检测技术在分布式光纤传感中的应用

Application of Edge Detection Technique to Distributed Fiber Sensor

论文大纲

万生鹏 ^1,2,*何赛灵 ²胡建东 ²高益庆 ¹

作者单位

¹ 南昌航空工业学院,江西南昌 330034

² 浙江大学光学仪器国家重点实验室光及电磁波研究中心,浙江杭州 310027

光纤光学分布式光纤传感布里渊频移双边缘技术相干检测 fiber optics distributed fiber sensor Brillouin frequency shift double-edge technique coherent detection

摘要

提出了采用双边缘技术测量光纤传感中的布里渊频移。利用边上信号对频率变化敏感的特点,提出了边缘检测技术,并通过设置最佳的工作点,使系统工作在最敏感的点上。理论分析表明,为实现0.5 MHz的布里渊频移测量精度,通过测量最大信号的常规检测所需的信噪比为65.1127 dB,单边缘检测所需的信噪比为37 dB,双边缘检测所需的信噪比为31 dB。所以,在相同信噪比下,与常规检测技术相比,边缘检测技术可以大大提高布里渊频移测量精度。

Abstract

Measurement of Brillouin frequency shift distribution in fiber sensor based on double-edge technique is proposed. Utilizing the characteristic that the edge signal is sensitive to the change of frequency, edge detection technique is proposed, and the system is operated on the best sensitive point by setting the optimum point. From the theoretical analysis, in order to achieve Brillouin frequency shift accuracy of 0.5 MHz, the signal to noise ratio (SNR) required are 65.1127 dB, 37 dB and 31 dB for conventional detection by measuring the maximum signal, single-edge technique, and double-edge technique, respectively. So, for the same SNR, edge techniques can improve the measurement accuracy of Brillouin frequency shift greatly comparing with the conventional detection techniques.

参考文献

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万生鹏, 何赛灵, 胡建东, 高益庆. 边缘检测技术在分布式光纤传感中的应用[J]. 中国激光, 2005, 32(5): 673. 万生鹏, 何赛灵, 胡建东, 高益庆. Application of Edge Detection Technique to Distributed Fiber Sensor[J]. Chinese Journal of Lasers, 2005, 32(5): 673.

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