一种具有迈克耳逊结构的新型光时域反射仪  

A Novel Optical Time Domain Reflectometer with Michelson Structure

作　　者：范登华[1] 刘永智[1] 张利勋[1] 

机构地区：[1]电子科技大学光电信息学院,四川成都610054

出　　处：《红外》2009年第6期35-38,共4页Infrared

摘　　要：利用传输光纤中后向瑞利散射光携带有光纤位置、外界振动等信息的特点,采用光纤迈克耳逊结构构成干涉型光时域反射仪,有望以分布方式传感沿光纤的微小振动信号。文中设计了一种新型结构的分布式光纤振动传感器,该传感器用3dB耦合器将波长为1310nm的红外激光分为两路相干光:参考光和传感光,它们中的后向瑞利散射光在耦合器处发生干涉,干涉信号的变化点对应于振动点所在的位置。将没有振动信号、加微小振动信号和加损耗干扰三种情况分别作用于传感光纤并进行了试验对比。结果表明,在微小振动的情况下,光强变化微弱;加损耗时,光强变化显著,定位准确。An Optical Time Domain Reflectometer （OTDR） with an optical fiber Michelson structure is designed according to the features that the Rayleigh backscattering light in optical fibers contain the information about dispersion and vibration. This reflectometer is expected to sense the tiny vibration along optical fibers distributively. In this paper, a novel distributed optical fiber vibration sensor is proposed. In this sensor, a 3dB coupler is used to divide the infrared laser beam at the wavelength of 1310nm into two beams： a reference beam and a sensing beam. The Rayleigh backscattering light in two optical fibers interfere with each other in the coupler and the point at which the interfere signal is changed corresponds to the position at which the vibration occurs. The sensing optical fiber is tested in three cases of no vibration, tiny vibration and light loss respectively. The result shows that the light intensity is changed slightly in the case of tiny vibration and is changed remarkably when light loss exist.

关 键 词：干涉型光时域反射仪 瑞利散射 振动传感 迈克耳逊干涉仪 

分 类 号：TP216[自动化与计算机技术—检测技术与自动化装置]