Measurement of metal linear expansion coefficient by micro-displacement with 
double
&nbsp; differential Hall method

ZHANG Wen-zhao, TANG Xin-ling, LIU Zhi-zhuang, WANG Fei, ZHOU Wang, LI Xiang-min

doi:10.16854 / j.cnki.1000-0712.190540

College Physics >

2021 , Vol. 40 >Issue 5: 24

DOI: https://doi.org/10.16854 / j.cnki.1000-0712.190540

Measurement of metal linear expansion coefficient by micro-displacement with double differential Hall method

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School of Electronics and Information Engineering，Hunan University of Science and Engineering，Yongzhou，Hunan 425199，China

Received date: 2019-11-22

Revised date: 2020-09-06

Online published: 2021-05-17

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Abstract

The linear expansion coefficient is an important property of metal.Precise measurement of

this coeffi- cient is of great significance in mechanical manufacturing.In this paper，four linear

Hall elements and three instru- mentation amplifiers are used to form a double differential

micro-displacement sensor，which is used to measure the linear expansion coefficient of metal.The

experimental results show that the sensor has high sensitivity，good linearity and a measurement

error of 0.4%.

Key words： linear expansion coefficient; Hall method; double difference; micro-displacement

Cite this article

ZHANG Wen-zhao, TANG Xin-ling, LIU Zhi-zhuang, WANG Fei, ZHOU Wang, LI Xiang-min . Measurement of metal linear expansion coefficient by micro-displacement with double differential Hall method[J]. College Physics, 2021 , 40(5) : 24 . DOI: 10.16854 / j.cnki.1000-0712.190540

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