基于AWG的多通道光纤光栅传感解调系统

摘要

A multi-channel fiber Bragg grating (FBG) sensor demodulation system based on arrayed waveguide grating (AWG) is designed, which includes light sources, isolator, coupler, optical loop device, FBG, AWG, photo-electric detector, the amplifying circuit, low pass filter circuit and the ARM control circuit. The temperature of FBG can be demodulated accurately with the technology of light intensity demodulation. The experimental re-sults show that the measured demodulation error of the demodulation system is not more than ±0.1℃, the de-modulation range of FBG center wavelength is 1 545.30-1 560.50 nm. This multi-channel FBG sensor demodula-tion system can calculate 32 FBG temperature sensors in 4-channel simultaneously.%设计开发了一种基于陈列波导光栅（AWG）的多通道光纤光栅解调系统.该系统由宽带光源、隔离器、耦合器、光环路器、光纤布拉格光栅（FBG）传感器、AWG、光电探测电路、调理放大电路、低通滤波电路和ARM控制电路等组成，采用光强法解调技术，对FBG传感器的温度进行精确测量.实验结果表明：该解调系统测量误差不大于±0.1℃，FBG中心波长解调范围为1545.30~1560.50 nm，可实现对4通道的32个FBG传感器同时测量.