中国物理B ›› 2012, Vol. 21 ›› Issue (2): 20701-020701.doi: 10.1088/1674-1056/21/2/020701

• GENERAL • 上一篇    下一篇

李彦超,王春晖   

  • 收稿日期:2011-07-19 修回日期:2011-08-15 出版日期:2012-01-30 发布日期:2012-01-30
  • 通讯作者: 李彦超,ycl.hit1982@yahoo.com.cn E-mail:ycl.hit1982@yahoo.com.cn

A method of measuring micro-impulse with torsion pendulum based on multi-beam laser heterodyne

Li Yan-Chao(李彦超) and Wang Chun-Hui(王春晖)   

  1. National Key Laboratory of Tunable Laser Technology, Harbin Institute of Technology, Harbin 150001, China
  • Received:2011-07-19 Revised:2011-08-15 Online:2012-01-30 Published:2012-01-30
  • Contact: Li Yan-Chao,ycl.hit1982@yahoo.com.cn E-mail:ycl.hit1982@yahoo.com.cn
  • Supported by:
    Project supported by the National Natural Science Foundation of China (Grant No. 61078063) and the Harbin Institute of Technology Incubation Program of Major International Science and Technology Cooperation, China (Grant No. HIT.ICRST2010024).

Abstract: In this paper, we propose a novel method of multi-beam laser heterodyne measurement for micro-impulse. The measurement of the micro-impulse, which is converted into the measurement of the small tuning angle of the torsion pendulum, is realized by considering the interaction between pulse laser and working medium. Based on Doppler effect and heterodyne technology, the information regarding the small tuning angle is loaded to the frequency difference of the multi-beam laser heterodyne signal by the frequency modulation of the oscillating mirror, thereby obtaining many values of the small tuning angle after the multi-beam laser heterodyne signal demodulation simultaneously. Processing these values by weighted-average, the small tuning angle can be obtained accurately and the value of the micro-impulse can eventually be calculated. Using Polyvinylchlorid+2%C as a working medium, this novel method is used to simulate the value of the micro-impulse by MATLAB which is generated by considering the interaction between the pulse laser and the working medium, the obtained result shows that the relative error of this method is just 0.5%.

Key words: laser heterodyne, Doppler effect, Fourier analysis

中图分类号:  (Interferometers)

  • 07.60.Ly
42.25.Hz (Interference) 02.30.Nw (Fourier analysis)