J4 ›› 2010, Vol. 27 ›› Issue (5): 602-606.

• Laser Applications • Previous Articles     Next Articles

Study of self-mixing velocimeter using a edge emitting laser

LU Liang, DAI Jijun, ZHU Jun, ZHEN Shenglai, HAO Wenliang, YU Benli   

  1. Key Laboratory of Opto-Electronic Information Acquisition and Manipulation of Ministry of Education, Anhui University,  Heifei 230039, China
  • Received:2010-01-04 Revised:2010-03-08 Published:2010-09-28 Online:2010-08-31

Abstract:

Self-mixing interference produced by the feedback of light from a moved target into an Edge Emitting Laser (EEL) was experimentally investigated for sensing applications.  The self-mixing velocimeter with different types of surface,values of sample time and injection current, signal process system were also discussed. Results indicate that high precision requirement can be reached with different types of surface,values of sample time (0.1S,1S). Combined the experimental results of the self-mixing velocity measurement system, selecting proper injection current(above 1.1 times of threshold current) of EEL and null control technique can enhance Signal to Noise Ratio(SNR) of self-mixing signal. This conclusion can help us to improve the mechanism study and optimize the self-mixing vibration measurement system.

Key words: optical measurement, edge emitting laser, self-mixing, velocimeter