US 12,007,233 B2
Magnetic sensing for a scanning mirror in LiDAR system
Youmin Wang, Berkeley, CA (US); and Yufeng Wang, Mountain View, CA (US)
Assigned to BEIJING VOYAGER TECHNOLOGY CO., LTD., Beijing (CN)
Filed by BEIJING VOYAGER TECHNOLOGY CO., LTD., Beijing (CN)
Filed on Mar. 4, 2021, as Appl. No. 17/192,697.
Prior Publication US 2022/0282965 A1, Sep. 8, 2022
Int. Cl. G02B 26/08 (2006.01); G01B 7/30 (2006.01); G01S 7/481 (2006.01); G01S 17/08 (2006.01); G02B 26/10 (2006.01)
CPC G01B 7/30 (2013.01) [G01S 7/4817 (2013.01); G01S 17/08 (2013.01); G02B 26/0833 (2013.01); G02B 26/105 (2013.01)] 20 Claims
OG exemplary drawing
 
1. A magnetic sensing system for a scanning mirror, comprising:
a permanent magnet configured to provide a magnetic field;
a wire coil configured to rotate relative to the permanent magnet when the scanning mirror rotates, causing an induced voltage in the wire coil, wherein one of the permanent magnet and the wire coil locates on and rotates with the scanning mirror and the other locates off the scanning mirror; and
at least one controller configured to determine a rotation angle of the scanning mirror based on the induced voltage in the wire coil.