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研究一种融合双波长干涉及单波长干涉的大跨距高精度光纤位移传感系统。两种波长不同的光波同时作用于光纤干涉仪中,基于波分复用技术,利用光纤光栅分离双波长干涉信号和单波长干涉信号。利用双波长干涉信号决定被测位移的幅值,使最大测量跨距扩大至毫米量级。在本系统选定的两个激光波长(分别为1 557.32nm和1 558.52nm)下,最大测距为0.5mm,通过恰当地选用传感系统中的两个激光波长,可获得更大的测距范围;利用单波长干涉信号高精度地测量位移,使系统保持单波长干涉测量精度高的优点。
A large-span and high-precision optical fiber displacement sensor system with dual-wavelength interference and single-wavelength interference is studied. Two kinds of light waves with different wavelengths are simultaneously applied to the optical fiber interferometer. Based on the wavelength division multiplexing technology, the optical fiber grating is used to separate the dual-wavelength interference signals and the single-wavelength interference signals. The use of dual-wavelength interference signals determine the amplitude of the measured displacement, extending the maximum measurement span to the order of millimeters. In the system selected two laser wavelengths (respectively 1 557.32nm and 1 558.52nm), the maximum distance of 0.5mm, by the appropriate choice of the two laser wavelengths in the sensing system, you can get a larger measurement Distance range; the use of single-wavelength interference signal measurement of displacement with high accuracy, the system to maintain single-wavelength interference measurement accuracy advantages.