红外与激光工程, 2015, 44 (9): 2800, 网络出版: 2016-01-26   

φ-OTDR振动传感系统中的相位模糊问题

Phase ambiguity in φ-OTDR vibration sensing system
作者单位
华北电力大学 电子与通信工程系,河北 保定 071003
摘要
针对φ-OTDR振动传感系统中的相位模糊问题,推导了背向瑞利散射光功率与干涉光场相位差、干涉光场相位差与光纤应变的关系式,分析了相位模糊现象的发生原因及表现形式,研究了相位模糊对传感系统性能的影响及系统最大可检测应变与空间分辨率的关系,并进行了仿真验证。结果表明:相位模糊是限制系统应变测量范围的主要因素,它会引起振动频率的误判和振动幅度的测量错误,还可能导致大应变信息的漏报;系统空间分辨率越高,应变测量范围越大,说明φ-OTDR振动传感系统适用于高空间分辨率振动的测量。研究结果为φ-OTDR振动传感系统参数设计和系统优化提供了理论参考。
Abstract
Aimed at the phase ambiguity phenomenon existing in the φ-OTDR based vibration sensing system, the expression to describe the relationship between the Rayleigh backscattering power and the phase difference of optical interference fields, and the expression to describe the relationship between the phase difference of optical interference fields and the strain of optical fiber induced by vibration were derived. The cause and manifestation of the phase ambiguity phenomenon and the influence of the phase ambiguity phenomenon on system performance as well as the relationship between the maximum detectable strain and the spatial resolution of the sensing system were studied theoretically, and demonstrated by Matlab simulation. The results show that the phase ambiguity phenomenon is the main factor that limits the strain measurement range of the φ-OTDR based vibration sensing system, and it may cause mistakes in the measurement of vibration frequency and amplitude, and a failure in reporting large strain information. And the higher the spatial resolution, the larger the detectable strain range, which indicates that the φ-OTDR based vibration sensing system is very suitable for applications in the measurement with high spatial resolution. This study provides a theoretical support for the parameter design and optimization of the sensing system.

李永倩, 马立. φ-OTDR振动传感系统中的相位模糊问题[J]. 红外与激光工程, 2015, 44(9): 2800. Li Yongqian, Ma Li. Phase ambiguity in φ-OTDR vibration sensing system[J]. Infrared and Laser Engineering, 2015, 44(9): 2800.

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