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

中国物理B ›› 2011, Vol. 20 ›› Issue (1): 14208-014208.doi: 10.1088/1674-1056/20/1/014208

• CLASSICAL AREAS OF PHENOMENOLOGY • 上一篇下一篇

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

李彦超, 王春晖, 曲杨, 高龙, 丛海芳, 杨彦玲, 高洁, 王遨游

National Key Laboratory of Tunable Laser Technology, Harbin Institute of Technology, Harbin 150001, China

收稿日期:2010-05-04 修回日期:2010-08-23 出版日期:2011-01-15 发布日期:2011-01-15
基金资助:
Project supported by the National Natural Science Foundation of China (Grant No. 60577032).

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

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)

National Key Laboratory of Tunable Laser Technology, Harbin Institute of Technology, Harbin 150001, China

Received:2010-05-04 Revised:2010-08-23 Online:2011-01-15 Published:2011-01-15
Supported by:
Project supported by the National Natural Science Foundation of China (Grant No. 60577032).

摘要/Abstract

摘要： 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%.

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%.

Key words: linear expansion coefficient, multi-beam laser heterodyne, laser Doppler technique, contactless measurement

中图分类号: (Optical testing techniques)

42.87.-d

07.60.Ly (Interferometers) 42.25.Hz (Interference) 06.20.Jr (Determination of fundamental constants)

李彦超, 王春晖, 曲杨, 高龙, 丛海芳, 杨彦玲, 高洁, 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[J]. 中国物理B, 2011, 20(1): 14208-014208.

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[J]. Chin. Phys. B, 2011, 20(1): 14208-014208.

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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

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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