【作者】 甄胜来； 俞本立； 朱军； 曹志刚； 吴许强；

【Author】 ZHEN Shenglai, YU Benli, ZHU Jun, CAO Zhigang, WU Xuqiang Physics Department, Anhui University 230039

【机构】 安徽大学物理系；

【摘要】 在传统的激光多普勒测振方法中,频移信号的检测通常需要比较复杂的频率或相位解调系统。本文从激光多普勒频移和干涉理论出发,提出一种适于测量振幅小于纳米量级的振动信号的简便方法――直接强度解调法,并分析了直接强度解调法所适用的范围。在实验中利用迈克尔逊干涉仪结构、采用直接强度解调的方法,对振幅约1nm的振动信号,实验检测结果具有23dB的信噪比,证实了可以利用直接强度解调的方法对振幅小于纳米量级的振动信号进行检测。更多还原

【Abstract】 Conventional Doppler vibration measurement methods generally involve complicated frequency or phase demodulation system. In this paper, we set forth a simple method to measure micro vibration according to laser Doppler frequency shifts and interference theory. Applicability of this method, which is direct intensity demodulation method, is analyzed in this paper. In experiments, we use Michelson interferometer and direct intensity demodulation method. The experiment results including a SNR of 23dB when the vibration amplitude is about 1nm, which means we can use direct intensity demodulation method measure vibration signal with amplitude less than 1nm.更多还原