【摘要】 采用新型垂直腔面发射激光器(VCSEL)作为激光自混合振动测量系统的激光光源,针对不同驱动信号频率(1 kHz,2 kHz)、驱动信号幅度(880 mV,1.66 V)的振动驱动信号对激光自混合振动测量信号系统进行实验研究,并与通过激光稳态方程所获得的激光自混合振动信号仿真进行了比较分析。结果表明,2 kHz相对1 kHz驱动信号产生的自混合振动信号在相同时间周期内具有2倍的波数,而振动物体的振动频率驱动信号幅度为0.88 mV时激光自混合振动信号单振动周期内的波数约恰为驱动信号幅度为1.66 V所产生激光自混合振动信号的1/2,因此可以通过激光自混合信号测量获得待测振动物体振动信息的测量。更多还原

【Abstract】 The laser interferometry based on self-mixing effect is well-established technique,and widely used to measure displacement,velocity,vibration and distance due to its ompactness,robustness,as well as low cost.We experimentally investigated the self-mixing interference produced by the feedback of light from a vibrated target into vertical-cavity surface-emitting lasers(VCSELs) for sensing applications,and a theoretical analysis by rate equation was proposed.In this paper,the self-mixing vibrometer employing driven signals with different frequencies(1 kHz,2 kHz) and amplitudes(880 mV,1.66 V) was also discussed.Results indicate that the wave number of self-mixing signal with 2 kHz driven signal is two times of that with 1 kHz driven signal during one period,while the wave number of self-mixing signal with 880 mV driven signal is half of that with 1.66 V driven signal during one period,so frequency and amplitude of the driven signal can be obtained by self-mixing signal measurement.更多还原