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Proceedings Paper

A laser self-mixing interference vibrometer based on current modulation and DSP demodulation
Author(s): Wei Xia; Ming Wang; Wenhua Guo
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Paper 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.

Paper Details

Date Published: 11 November 2010
PDF: 6 pages
Proc. SPIE 7855, Optical Metrology and Inspection for Industrial Applications, 78551U (11 November 2010); doi: 10.1117/12.870264
Show Author Affiliations
Wei Xia, Nanjing Normal Univ. (China)
Ming Wang, Nanjing Normal Univ. (China)
Wenhua Guo, Nanjing Normal Univ. (China)


Published in SPIE Proceedings Vol. 7855:
Optical Metrology and Inspection for Industrial Applications
Kevin Harding; Peisen S. Huang; Toru Yoshizawa, Editor(s)

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