从激光二极管自混合干涉信号重建振动信号  

Reconstruction of Vibration Signal from Laser Diode Self-Mixing Interference Signal

作　　者：胡险峰[1] 

机构地区：[1]四川大学物理科学与技术学院,四川成都610064

出　　处：《中国激光》2009年第6期1498-1502,共5页Chinese Journal of Lasers

摘　　要：激光二极管(LD)自混合干涉用于振动测量的关键技术之一是从自混合干涉信号重建振动信号。用整形后的自混合干涉信号驱动模拟开关,开关电容做电荷转移来实现频率电压变换,用振动的激励信号驱动模拟开关让电容充电电源随振动的相位变化做倒相变换,从激光二极管自混合干涉信号中还原振动信号。还原出的信号的振幅与振动的振幅成正比,还原出的振动信号的波形与振动激励信号的波形一致。只要能从自混合干涉信号实时自动地提取外腔振动的周期及相位信号,该频率电压变换方法可以用于重建任意振动的信号。Reconstruction of vibration signal is one of the key technologies for laser diode （LD） self-mixing interference used in measurement of vibration. The vibration signal is retrieved by a frequency-voltage transform from self-mixing interference signal. The transform is realized by switched capacitor through charge transfer. There are two simulative switches in the transform： one driven by self-mixing interference signal making frequency of the switch equal to frequency of self-mixing interference signal, the other driven by stimulating signal of the vibration changing the pole of charging voltage of the capacitor with phase of the vibration. Output signal amplitude of the transform is proportional to vibration amplitude. The vibration waveform rebuilt by the transform is coincident with that of stimulating signal. The frequency-voltage transform can be use to rebuild signal of arbitrary vibration if period and phase of arbitrary vibration can be extracted from self-mixing interference signal.

关 键 词：光学测量 激光二极管 自混合干涉 信号重建 频率电压变换 

分 类 号：TN248.4[电子电信—物理电子学]