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长周期光纤光栅(LPFG)传感器具有非常广泛的应用价值,低成本、高精度解调技术是实用化的关键。利用全反射特性的光纤环形镜和2根LPFG构成干涉仪,采用法布里-珀罗(F-P)可调滤波器对某级干涉小峰进行波长扫描,借助探测器和示波器对信号光波在驱动信号周期内所形成的两负脉冲间隔进行测量,实现信号解调。利用此系统对质量浓度从0到饱和的蔗糖溶液进行测量,测得系统传感灵敏度的实验值为0.04 ms.L/g。
Long-period fiber grating (LPFG) sensor has a very wide range of applications, low-cost, high-precision demodulation technology is the key to practical. The interferometer is composed of a fiber ring mirror with total reflection characteristics and two LPFGs. A Fabry-Perot (FP) tunable filter is used to perform wavelength scanning on a small interference peak. With the help of a detector and an oscilloscope, Periods formed by the two negative pulse interval measurement, to achieve signal demodulation. The system was used to measure the mass concentration from 0 to saturated sucrose solution. The measured sensitivity of the system was 0.04 ms.L / g.