Laser & Optoelectronics Progress, Volume. 47, Issue 4, 41201(2010)
Laser Self-Mixing Interference Vibrometer Based on Current Modulation and DSP Demodulation
The modulation and demodulation technology of semiconductor laser self-mixing interference vibrometer is researched. With triangular wave modulation and DSP demodulation technology of self-mixing interference,a new type vibrometer is designed to achieve non-contact vibration measurement of a target. The theoretical model of the laser self-mixing interference vibrometer is analyzed and simulation and measurement error analysis are done using matlab. The modulation and demodulation technology of the vibrometer system and DSP-based data acquisition and processing system are researched. The vibrometer is small-sized,low-cost and easy to collimate,and can measure the object whose vibration frequency range arrives 5 kHz,and the vibration scope measuring accuracy may achieve 0.325 μm. The instrument can measure the vibration frequency and amplitude data of the vibration object and restore the vibration wave.
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[in Chinese], [in Chinese], [in Chinese], [in Chinese], [in Chinese]. Laser Self-Mixing Interference Vibrometer Based on Current Modulation and DSP Demodulation[J]. Laser & Optoelectronics Progress, 2010, 47(4): 41201
Category: Instrumentation, Measurement and Metrology
Received: Jun. 27, 2009
Accepted: --
Published Online: Mar. 30, 2010
The Author Email: (marksman_sz@163.com)