High-Precision Temperature Compensation for TMR Sensors
Author Information
Author(s): Wu Jie, Zhou Ke, Jin Qingren, Lu Baihua, Jin Zhenhu, Chen Jiamin
Primary Institution: State Key Laboratory of Transducer Technology, Aerospace Information Research Institute, Chinese Academy of Sciences
Hypothesis
Can a software-based temperature compensation method improve the accuracy of TMR weak current sensors?
Conclusion
The proposed method significantly enhances the temperature stability of TMR sensors, improving measurement accuracy in varying temperatures.
Supporting Evidence
- The sensitivity temperature drift coefficient was reduced from 1010 ppm/°C to 37 ppm/°C, a 96.34% improvement.
- The maximum measurement error decreased from 1.399 mA to 0.056 mA, improving accuracy by 95.99%.
- Zero-output temperature drift was significantly reduced, improving zero-drift stability by 82.85%.
- The method is effective over a wider temperature range of −40 °C to 120 °C.
Takeaway
This study shows how to make sensors that measure weak currents work better in different temperatures by using a smart computer program.
Methodology
The study used a combination of cubic spline interpolation and polynomial regression for temperature compensation, implemented via an FPGA.
Limitations
The study may not address all potential environmental factors affecting sensor performance.
Digital Object Identifier (DOI)
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