干涉型光纤传感器PGC解调算法的研究

相位生成载波解调（PGC）技术是一种广泛应用于干涉型光纤传感器的零差解调法。简要概述了PGC的定义以及调制原理,分析了几种解调算法,研究发现干涉信号幅度、调制深度会对解调结果产生影响。通过消除干涉信号幅度和调制深度的影响,可以减小解调信号的失真;并且,采用低阶次的混频载波可以减小采样频率。文中的结论对于干涉型光纤传感器的解调技术具有重要的理论参考价值。

Research on PGC Demodulation Algorithm of Interference Fiber Sensor

Phase generated carrier（PGC） demodulation technology is a kind of homodyne demodulation algo rithm widely used in interference fiber sensor systems. The definition and modulation principle of PGC are intro duced briefly. Different kinds of demodulation algorithms are analyzed and the results show that the demodulation signal is affected by the amplitude of interference signals and modulation depth. The distortion of demodulation sig nals is greatly decreased by eliminating these impacts. Moreover, the sampling frequency can be reduced by using the mixing carrier with lower orders. The results have significant theoretical reference value on the demodulation technology of interference fiber sensors.