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研究一种能够进行远程及绝对测量的光纤低相干干涉传感系统。该系统包含两个光纤干涉仪,其中一个光纤干涉仪置于被测场中感应被测量的变化,可实现远程测量;另一个光纤干涉仪解调被测量的值。运用波分复用技术,使用于解调的光纤干涉仪同时工作于低相干干涉和高相干干涉状态。用低相干干涉信号决定被测量的幅值,对被测量实现绝对测量,并使测量量程不受波长限制;同时,用高相干干涉信号对被测量进行高精度的测量。系统的测量量程为6mm,测量分辨率小于1nm,位移实验结果的线性相关系数R为0.99。
A low-coherence fiber optic interferometric sensing system capable of remote and absolute measurement is studied. The system consists of two fiber-optic interferometers. One of the fiber-optic interferometers is placed in the field to be measured and sensed for changes in the field, enabling remote measurements; the other fiber-optic interferometer demodulates the measured value. The use of wavelength division multiplexing technology, used in the demodulation of optical interferometer at the same time working in low coherent interference and high coherent interference state. With low coherence interference signal to determine the measured amplitude, to be measured to achieve absolute measurement, and the measurement range is not limited by the wavelength; the same time, high coherence interference signals measured with high precision measurements. The measurement range of the system is 6mm, the measurement resolution is less than 1nm, and the linear correlation coefficient R of the displacement experiment is 0.99.