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Frontiers of Optoelectronics

ISSN 2095-2759

ISSN 2095-2767(Online)

CN 10-1029/TN

Postal Subscription Code 80-976

Front Optoelec    2013, Vol. 6 Issue (2) : 210-215    https://doi.org/10.1007/s12200-013-0318-x
RESEARCH ARTICLE
Laser self-mixing interferometer for MEMS dynamic measurement
Zhaoyun ZHANG1(), Yang GAO1,2, Wei SU1
1. Institute of Electronic Engineering, China Academy of Engineering Physics, Mianyang 621900, China; 2. Key Laboratory of Optoelectronic Technology and System, Chongqing University, Chongqing 400030, China
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Abstract

Laser self-mixing interferometer has the advantages of simple architecture, compact size, naturally self-aligned optical characteristics, and low cost. It is promising to replace conventional interferometers for physical measurements, such as displacement, distance, velocity, vibration, and so on. In this paper, this interferometer was tried to be used for micro-electro-mechanical system (MEMS) dynamic measurement. Firstly, its measurement principle based on a three-mirror cavity model was presented, and then the laser self-mixing interferometer for MEMS dynamic measurement was designed, experiments were finally performed as target moves with different forms. Experimental results suggest that self-mixing interferometer is available for MEMS dynamic measurement, and may have wider applications in the future.

Keywords laser self-mixing interferometer      dynamic measurement      micro-electro-mechanical system (MEMS)     
Corresponding Author(s): ZHANG Zhaoyun,Email:zzy_caep@163.com   
Issue Date: 05 June 2013
 Cite this article:   
Zhaoyun ZHANG,Yang GAO,Wei SU. Laser self-mixing interferometer for MEMS dynamic measurement[J]. Front Optoelec, 2013, 6(2): 210-215.
 URL:  
https://academic.hep.com.cn/foe/EN/10.1007/s12200-013-0318-x
https://academic.hep.com.cn/foe/EN/Y2013/V6/I2/210
Fig.1  Schematic diagram of three-mirror cavity self-mixing interferer
Fig.2  Schematic diagram of MEMS structure
Fig.3  Signal waveform when the target moves in the way of sine wave
Fig.4  Schematic diagram of MEMS components resonance curve
Fig.5  Principle diagram of dynamic measurement system of laser self-mixing interferer
Fig.6  Light route of self-mixing interferer
Fig.7  Self-mixing interference with different movement form of PZT.
(a) Sine wave movement; (b) square movement; (c) saw tooth movement;
Fig.8  Self-mixing interference with high frequency vibration of PZT
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