中文摘要：

为了提高干涉型光纤传感器的信号检测能力,开发了基于LabVIEW平台的锁相放大器,并用于Sagnac干涉型光纤管道泄漏检测系统。以解调干涉信号相位,分析了锁相放大器的信号解调原理及泄漏源定位方法,并在泄漏位置为5.0 km处进行了有无泄漏及泄漏定位的实验研究,结果表明.该锁相放大器可以解调出泄漏信号,并能实现泄漏点精确定位.

英文摘要：

A Lock-in Amplifier based on LabVIEW platform is developed to improve the signal detection level of optical fiber sensor and is applied to demodulate interference signal phase from optical fiber pipeline leakage detecting system based on Sagnac interferometer. The demodulation principle of Lock-in Amplifier and the method of leaking source location for the detection system are analyzed, and an experiment is designed to detect leaking source and locate leaking source when the leakage occurs at 5.0 km. The results verify thai the developed Lock-in Amplifier can demodulate leakage signal, and the leaking point can be located accurately;