DFB激光器振动解调系统温度补偿的设计

Temperature Compensation in DFB Laser Vibration Interrogating System

介绍了DFB激光器结合光纤光栅测量振动信号的原理,并针对系统常见的温度干扰问题提出了采用PID调节DFB波长法和双光栅光强互补进行温度干扰抑制的措施。通过实验验证和比较了这两种方法的特点和效果,结果证明两种方法均对温度干扰有抑制作用,PID调节DFB激光器波长法可抑制较大的温度波动但灵敏度低,而双光栅互补温度补偿法抑制较小的温度波动但灵敏度比PID调节方法高,两者联合使用可使系统在较宽的温度波动范围内仍保持良好的性能。

One method to interrogate vibration based on DFB laser and fiber grating is introduced,and one method called dual gratings compensation to alleviate the interference caused by temperature is also proposed.Dual gratings compensation and PID adjustment are compared and verified by experiment.The results show that PID adjustment have good effect for bigger disturbance but have lower sensitivity,while the dual gratings compensation can depress the smaller temperature disturbance but have bigger sensitivity.Combining the two methods in the system can achieve good effect within wide range of temperature.