A laser self-mixing interference vibrometer based on current modulation and DSP demodulation

Wei Xia; Ming Wang; Wenhua Guo

doi:10.1117/12.870264

11 November 2010 A laser self-mixing interference vibrometer based on current modulation and DSP demodulation

Wei Xia, Ming Wang, Wenhua Guo

Proceedings Volume 7855, Optical Metrology and Inspection for Industrial Applications; 78551U (2010) https://doi.org/10.1117/12.870264
Event: Photonics Asia 2010, 2010, Beijing, China

Abstract

The modulation and demodulation technique of laser self-mixing interference vibrometer is researched in this paper. Combining with triangular current modulation and DSP demodulation technique, a new-type laser self-mixing interference vibrometer is designed to achieve non-contact vibration measurement of a target. Theoretical analysis, simulation results and error evaluation are presented in this paper. The vibration waveform is reconstructed with an accuracy of 0.325 micron in a wide dynamic range. Experiments results show a good agreement with the simulative results. The vibrometer is compact, inexpensive, self-aligning and can be applied to various vibration measurements for its simplicity.

Citation Download Citation

Wei Xia, Ming Wang, and Wenhua Guo "A laser self-mixing interference vibrometer based on current modulation and DSP demodulation", Proc. SPIE 7855, Optical Metrology and Inspection for Industrial Applications, 78551U (11 November 2010); https://doi.org/10.1117/12.870264

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