使用微波作为副载波的光纤应力传感器

Fiber tension sensor using microwave as subcarrier

光纤应力传感器是以光纤传感技术为基础的应变、应力测量系统,具有重要的民用、军用价值。其中有一种能用于大型建筑物形变监测的传统的光纤应力传感器又叫SOFO。它使用迈克尔逊干涉仪作为信号解调器,因为需要扫描,所以响应时间较长。为了解决这一问题,出现了以微波作为副载波的应力传感器。但是其中使用的光环行器又引入了较大误差,使得系统性能不理想。本文分析了误差原因,并使用耦合器、相位比较器分别替代了环形器、乘法器,取得了良好的实验结果。

Fiber tension sensor is a fiber sensing system for measuring strain and stress,and it has significant commer-cial and military value.One of the traditional fiber tension sensors can be used to monitor the deformation of build-ings,and is also known as SOFO.It uses Michelson interferometer as signal demodulator.Its response time is long as scanning is needed.In order to solve this problem,fiber tension sensors using microwave as subcarrier is presented.However,the optical circulator used in it brings large error,which makes the performance unsatisfacto-ry.The error sources was analyzed,and optical coupler and phase comparator were used to replace the optical circula-tor and the multiplier.Good experiment result has been gotten.