正弦相位调制双法布里－珀罗干涉术的实验研究

Experimental Research on Sinusodial Phase Modulating Double F-P Interferometry

讨论了光纤传光、正弦相位调制的双法布里－珀罗（Ｆａｂｒｙ－Ｐｅｒｏｔ）干涉术实验结果．通过光强信号的傅里叶分析，证实基频幅值和相位均含谐振腔长度或程函变化信息，从而提出实现基频相位或幅值测量的时间间隔测量法或幅值整流基频幅值测量法．在已研制的实验装置上，测试两种方法的灵敏度阈，结果表明：作者提出的平行双通道结构和光纤传光的测试方法能补偿谐振腔温漂影响，简化信号处理过程，更适合实时测量．

Experiment on multi-mode fibre used for light transmiting,sinusodial phase modulating F-P interferometry has been performed.It has been proved by using Fourier analysis of intensity signal that either fundermental frequence amplitude or phase of intensity imply some information about the change of cavity length (or optical path difference).Therefore a method of time duration measurement for measuring phase or fundermental frequence amplitude has been suggested.Analyses of the sensitivity thresholds measured with the present set-up show that the method and the set-up could be free of temperature drift and simplify the signal processing, hence be more suitable for the on-line measurement.