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

doi:10.1088/1674-1056/21/2/020701

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%.

Keywords: laser heterodyne Doppler effect Fourier analysis

Received: 19 July 2011
Revised: 15 August 2011
Accepted manuscript online:

PACS:	07.60.Ly	(Interferometers)
	42.25.Hz	(Interference)
	02.30.Nw	(Fourier analysis)

Fund: 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).

Corresponding Authors: Li Yan-Chao,ycl.hit1982@yahoo.com.cn
E-mail: ycl.hit1982@yahoo.com.cn

Cite this article:

Li Yan-Chao(李彦超) and Wang Chun-Hui(王春晖) A method of measuring micro-impulse with torsion pendulum based on multi-beam laser heterodyne 2012 Chin. Phys. B 21 020701

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

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