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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。
Laser diode (LD) self-mixing interference One of the key techniques for vibration measurement is to reconstruct the vibration signal from a self-mixing interference signal. The self-mixing interference signal is used to drive the analog switch, and the switched capacitor is used for charge transfer to realize the frequency voltage conversion. The analog switch is driven by the vibration excitation signal to make the phase change of the capacitor charging power vary with the vibration. Interferometry signal to restore the vibration signal. The amplitude of the restored signal is proportional to the amplitude of the vibration, and the waveform of the recovered vibration signal is consistent with the waveform of the vibration excitation signal. As long as the periodic and phase signals of the external cavity vibration can be automatically extracted in real time from the self-mixing interference signal, the frequency-voltage transformation method can be used to reconstruct any vibration signal.