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Hall-Effect Sensor Technique for No Induced Voltage in AC Magnetic Field Measurements Without Current Spinning
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  • Anand Lalwani ,
  • Ananth Saran Yalamarthy ,
  • Debbie Senesky ,
  • Maximillian Holliday ,
  • Hannah Alpert
Anand Lalwani
Stanford University

Corresponding Author:[email protected]

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Ananth Saran Yalamarthy
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Debbie Senesky
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Maximillian Holliday
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Hannah Alpert
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Accurately sensing AC magnetic field signatures poses a series of challenges to commonly used Hall-effect sensors. In particular, induced voltage and lack of high-frequency spinning methods are bottlenecks in the measurement of AC magnetic fields. We describe a magnetic field measurement technique that can be implemented in two ways: 1) the current driving the Hall-effect sensor is oscillating at the same frequency as the magnetic field, and the signal is measured at the second harmonic of the magnetic field frequency, and 2) the frequency of the driving current is preset, and the measured frequency is the magnetic field frequency plus the frequency of the current. This method has potential advantages over traditional means of measuring AC magnetic fields used in power systems (e.g., motors, inverters), as it can reduce the components needed (subsequently reducing the overall cost and size) and is not frequency bandwidth limited by current spinning. The sensing technique produces no induced voltage and results in a low offset, thus preserving accuracy and precision in measurements. Experimentally, we have shown offset voltage values between 8 and 27 μT at frequencies ranging from 100 Hz to 1 kHz, validating the potential of this technique in both cases
15 Jan 2022Published in IEEE Sensors Journal volume 22 issue 2 on pages 1245-1251. 10.1109/JSEN.2021.3130527