High-precision micro-displacement sensor based on tunnel magneto-resistance effect.

High-precision micro-displacement sensor based on tunnel magneto-resistance effect.
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DOI:
10.1038/s41598-022-06965-3
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发表时间:
2022-02-22
期刊:
影响因子:
4.6
通讯作者:
Li M
Li M
中科院分区:
综合性期刊3区
文献类型:
--
作者:
Wang X;Li W;Jin L;Gong M;Wang J;Zhong Y;Ruan Y;Guo C;Xin C;Li M

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A high-precision micro-displacement sensor based on tunnel magneto-resistance effect is reported.We designed and simulated magnetic characteristics of the sensor, and employed chip-level Au-In bonding to implement low-temperature assembly of the TMR devices. We employed the subdivision interpolation technique to enhance the resolution by translating the sine-cosine outputs of a TMR sensor into an output that varies linearly with the displacement. Simultaneously, using the multi-bridge circuit method to suppress external magnetic and geomagnetic interference. Experimental result shows that the micro-displacement sensor has a resolution of 800 nm, accuracy of 0.14 and a full-scale range of up to millimeter level. This work enables a high-performance displacement sensor, and provides a significant guide for the design of a micro-displacement sensor in practical applications.
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