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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。
A new type of vertical cavity surface emitting laser (VCSEL) was used as the laser light source in the laser self-mixing vibration measurement system. The laser driving signals with different driving signal frequency (1 kHz, 2 kHz) and driving signal amplitude (880 mV, 1.66 V) Self-mixing vibration measurement signal system for experimental study, and with laser steady-state equation obtained by laser self-mixing vibration signal simulation were compared. The results show that the self-mixing vibration signal generated by the 2 kHz relative 1 kHz drive signal has twice the wave number in the same time period, while the oscillation frequency of the vibration object drives the signal amplitude of 0.88 mV. The wave number is just about 1/2 of the laser self-mixing vibration signal generated by the driving signal amplitude of 1.66 V. Therefore, the measurement of the vibration information of the vibration object to be measured can be obtained by laser self-mixing signal measurement.