Numerical investigation of multi-beam laser heterodyne measurement with ultra-precision for linear expansion coefficient of metal based on oscillating mirror modulation

doi:10.1088/1674-1056/20/1/014208

Abstract This paper proposes a novel method of multi-beam laser heterodyne measurement for metal linear expansion coefficient. Based on the Doppler effect and heterodyne technology, the information is loaded of length variation to the frequency difference of the multi-beam laser heterodyne signal by the frequency modulation of the oscillating mirror, this method can obtain many values of length variation caused by temperature variation after the multi-beam laser heterodyne signal demodulation simultaneously. Processing these values by weighted-average, it can obtain length variation accurately, and eventually obtain the value of linear expansion coefficient of metal by the calculation. This novel method is used to simulate measurement for linear expansion coefficient of metal rod under different temperatures by MATLAB, the obtained result shows that the relative measurement error of this method is just 0.4%.

Keywords: linear expansion coefficient multi-beam laser heterodyne laser Doppler technique contactless measurement

Received: 04 May 2010
Revised: 23 August 2010
Accepted manuscript online:

PACS:	42.87.-d	(Optical testing techniques)
	07.60.Ly	(Interferometers)
	42.25.Hz	(Interference)
	06.20.Jr	(Determination of fundamental constants)

Fund: Project supported by the National Natural Science Foundation of China (Grant No. 60577032).

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Li Yan-Chao(李彦超), Wang Chun-Hui(王春晖), Qu Yang(曲杨), Gao Long(高龙), Cong Hai-Fang(丛海芳), Yang Yan-Ling(杨彦玲), Gao Jie(高洁), and Wang Ao-You(王遨游) Numerical investigation of multi-beam laser heterodyne measurement with ultra-precision for linear expansion coefficient of metal based on oscillating mirror modulation 2011 Chin. Phys. B 20 014208

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Numerical investigation of multi-beam laser heterodyne measurement with ultra-precision for linear expansion coefficient of metal based on oscillating mirror modulation

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