干涉型光纤法布里-珀罗传感系统抗噪方法的实验研究

Experimental Investigation on Antinoise Technique of Interferometric Fiber Fabry-Perot Sensor System

对于干涉型光纤法布里-珀罗(FFP)传感系统,外界环境对解调干涉仪的扰动是其主要噪声源之一。在光纤布拉格光栅构成的FFP传感系统中,对比分析了采用参考传感器和参考光源两种抗噪方法。实验结果表明,对于单频和宽带干扰,两种方法均可提高信噪比到40dB。而且由于采用窄线宽光纤激光器作为参考光源的噪声水平较低,其差分探测结果具有更好的抗噪效果。

In interferometric fiber Fabry-Perot （FFP） sensor systems, environmental disturbances in interrogation interferometers are a dominant source of noise. In a fiber Bragg grating defined FFP sensor system, the antinoise techniques utilizing reference sensor and reference wavelength are compared with each other. Signal-to-noise ratio improvements of 40 dB have been achieved experimentally for both single-frequency and broadband disturbances. Moreover, because of the lower noise level of the reference fiber laser with a narrow linewidth, the differential result of the reference wavelength approach exhibits a better antinoise effect.