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研制了一种基于光纤FBG光栅和PID控制技术的超声光纤检测系统。该系统通过锁定可调激光器波长和FBG光栅反射波长的相对位置来滤除低频信号,被测物体激发的超声波引起FBG光栅波长反射输出功率的变化,光电探测器探测到该变化并显示,同时通过PID控制电路反馈调节可调激光器的波长输出用于保持FBG光栅的反射波长。实验表明,该系统可实时检测被测物体受激发产生的超声信号。
A kind of ultrasonic fiber detection system based on fiber FBG grating and PID control technology was developed. The system filters out the low frequency signal by locking the relative positions of the tunable laser wavelength and the FBG grating reflection wavelength. The ultrasonic wave excited by the measured object causes the change of the output power of the FBG grating wavelength reflection. The photodetector detects this change and displays the same while passing PID Control Circuit Feedback Adjustable The wavelength output of the tunable laser is used to maintain the reflected wavelength of the FBG grating. Experiments show that this system can detect the ultrasonic signal generated by the excited object in real time.