提高光纤传感测量精度的方法研究

Method or improving measurement precision for optical fiber sensor

采用激光干涉原理实现了微位移光纤传感测量。通过对光学系统和光电检测系统的研究，总结出提高光纤传感测量精度的方法，文中对微弱光信号的相位调制，数字解理过程，给出了低噪声设计的理论依据，电路参数的选取原则和预放级设计的一般方法。系统微位移测试精度约０．０５ｎｍ。

Improvement on measuring precision of a optical fiber sensor, based on principle of laser interference, was proposed through the investigation of both the optical system and the opticalelectron measuring system. The theoretical foundation, the selecting principle of circuit parameters and the designing method of preamplifier were given and analyzed in detail for the phase modulation of low noise of weak signal and the demodulation procedure of telephone digits. A precision of 0. 05nm for micro-displacement measurement has been obtained by this new method.