College Physics ›› 2021, Vol. 40 ›› Issue (5): 24-.doi: 10.16854 / j.cnki.1000-0712.190540
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ZHANG Wen-zhao，TANG Xin-ling，LIU Zhi-zhuang，WANG Fei，ZHOU Wang， LI Xiang-min
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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
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-.
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URL: https://dxwl.bnu.edu.cn/EN/10.16854 / j.cnki.1000-0712.190540
https://dxwl.bnu.edu.cn/EN/Y2021/V40/I5/24
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