Magnetic sensing for a polygon mirror using a hall sensor for LiDAR system
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United States of America
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Apr 1, 2025
Grant Date -
Oct 27, 2022
app pub date -
Apr 22, 2021
filing date -
Apr 22, 2021
priority date (Note) -
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status (Latency Note)
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Abstract
Embodiments of the disclosure provide magnetic sensing systems and methods for a polygon scanner. An exemplary magnetic sensing system includes a disc permanent magnet configured to provide a magnetic field. The magnetic sensing system further includes a Hall sensor configured to generate a voltage proportional to the strength of the magnetic field as the Hall sensor and the disc permanent magnet move relatively to each other when the polygon mirror rotates. One of the disc permanent magnet and the Hall sensor locates on and rotates with the polygon mirror and the other locates off the polygon mirror. The magnetic sensing system also includes at least one controller configured to determine a rotation angle of the polygon mirror based on the generated voltage by the Hall Sensor.
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