光纤光栅传感弱信号探测电路的设计与优化

Design and Optimization of Fiber Bragg Grating Sensing Weak Signal

光纤光栅信号的探测电路设计是实现物理量高精度检测的重要环节。针对高频、高灵敏度、高信噪比的检测需求,利用负向偏置的光电二极管和运算放大器设计了光电转换电路,滤波电路采用压控电压源二阶低通巴特沃斯型滤波器,频率响应范围为0~200 k Hz。实验结果表明,电路对静态和动态冲击信号都有较好的检测效果且保持较高的信噪比,为进一步信号的分析和处理提供了良好的前提。

Detection circuit design of FBG signal was the primary step to realize physical high precision detection.Aiming at detection request of high frequency, high sensitivity and high SNR, Negative biasphotodiode and operational amplifier were used to design the photovoltaic conversion circuit. Filter circuit adopted the voltage-eonrolled voltage source type second-order low-pass butterworth filter,whose frequency response range was 0 to 200 kHz.Experimental results show that circuit for static and dynamic impact signal has good detection efect. Besides, it has high signal to noise ratio.thus providing good premise for the signal furthera- nalysis and processing.