反射式光纤电流传感的锁相检测法与近似误差  

Signal detection and approximate error of reflecting fiber-optic current sensing

作　　者：李建中[1] 李泽仁[1] 邓向阳[1] 王荣波[1] 张登洪[1] 田建华[1] 

机构地区：[1]中国工程物理研究院流体物理研究所,四川绵阳621900

出　　处：《传感器与微系统》2010年第1期87-90,共4页Transducer and Microsystem Technologies

摘　　要：对反射式Sagnac型全光纤电流传感器中光信号的检测方法进行了深入的分析,并对固有的小角近似误差进行了充分的理论分析和数值模拟。针对反射式光纤电流传感器中极其特殊的信号检测要求,采用了锁相检测法来处理传感信号。商用化的光纤电流传感器的误差一般要求小于0.2%,而在各类检测方法的信号处理中,一个必须的步骤是sinθ≈θ,该步骤造成的小角近似误差极大地影响了整个系统的测量精度。通过对这2个问题进行深入的分析与模拟,对解决光纤电流传感器的检测方法设计、测量精度、灵敏度等问题提供了较大的参考价值。The optical signal detection of fiber-optic current transducer （ FOCT）, based on the in-line Sagnac interferometer,is analyzed in detail. The theoretical analysis and digital simulation of approximate error are also developed sufficiently. The phase-locked detection method used in the special system is described. The error of commercial FOCT should be less than 0.2 % , sin θ≈θ, which is usefull and necessary for signal processing. It is one of the bad factors that lower the measurement precision. The detailed analysis and simulation of the two subjects are valuable for solving a great deal of problems, such as signal detection, measurement precision, measurement sensitivity,et al.

关 键 词：光纤电流传感器 信号检测 测量精度 近似误差 

分 类 号：TP212.14[自动化与计算机技术—检测技术与自动化装置] TN911.7[自动化与计算机技术—控制科学与工程]