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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。
The principle of DFB laser combined with FBG to measure vibration signal is introduced. Aiming at the common temperature disturbance of the system, the measures of using PID adjusting DFB wavelength method and double grating intensity complementarity to suppress temperature interference are put forward. The characteristics and effects of the two methods are verified and compared. The results show that both methods can restrain the temperature disturbance. The PID-controlled DFB laser wavelength method can restrain the large temperature fluctuation but the sensitivity is low, while the double grating complementary temperature The compensation method suppresses the small temperature fluctuation but the sensitivity is higher than the PID adjustment method. The combination of the two can keep the system maintain good performance over a wide temperature fluctuation range.