A Laser Self-mixing Interference Vibrometer Based On Current Modulation and DSP Demodulation

作者：Xia Wei^*; Wang Ming; Guo Wenhua

来源：Conference on Optical Metrology and Inspection for Industrial Applications, 2010-10-18 to 2010-10-20.

DOI：10.1117/12.870264

• self-mixing interference
• vibrometer
• DSP technique

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.

• 出版日期2010
• 单位南京师范大学