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

被引：7

作者：

Li Yan-Chao ^{[1
]}

Wang Chun-Hui ^{[1
]}

Qu Yang ^{[1
]}

Gao Long ^{[1
]}

Cong Hai-Fang ^{[1
]}

Yang Yan-Ling ^{[1
]}

Gao Jie ^{[1
]}

Wang Ao-You ^{[1
]}

机构：

[1] Harbin Inst Technol, Natl Key Lab Tunable Laser Technol, Harbin 150001, Peoples R China

来源：

CHINESE PHYSICS B | 2011年 / 20卷 / 01期

基金：

中国国家自然科学基金;

关键词：

linear expansion coefficient; multi-beam laser heterodyne; laser Doppler technique; contactless measurement; DEPTH;

D O I：

10.1088/1674-1056/20/1/014208

中图分类号：

O4 [物理学];

学科分类号：

0702 ;

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%.

引用

页数：7

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