A scheme for demodulation of fiber grating sensors with high resolution

Abstract

报道了一种基于光纤激光器波长扫描寻址的高分辨率的光纤光栅传感解调方案。光纤激光器的扫描寻址过程由微机来控制。微机控制光纤激光器波长扫描的同时 ,同步采集、处理传感信号 ,并通过曲线拟合给出传感光栅的中心反射波长值。本解调方案的波长移动分辨率为0 .1pm,可实现高分辨率的温度及应变测量。 A novel approach for demodulation of fiber grating sensors with high resolution is proposed based on a tunable fiber laser interrogating the sensing fiber grating. The fiber laser scanning for interrogation is controlled by computer. The computer synchronously performs data gathering and data processing while it controls laser wavelength scanning. The Bragg wavelength of sensing grating is determined by using the Gaussian Newton curve fitting approach. The wavelength shift resolution of this scheme is 0.1 pm, which can be used in the measurement of temperature or strain with high resolution capability.