US 12,007,233 B2 · Magnetic sensing for a scanning mirror in LiDAR system

Abstract

Embodiments of the disclosure provide magnetic sensing systems and methods for a scanning mirror. An exemplary magnetic sensing system includes a permanent magnet configured to provide a magnetic field. The magnetic sensing system further includes a wire coil configured to rotate relative to the permanent magnet when the scanning mirror rotates, causing an induced voltage in the wire coil. 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. The magnetic sensing system also includes at least one controller configured to determine a rotation angle of the scanning mirror based on the induced voltage in the wire coil.

Claims20

Dependent claims

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.

1 more element

A magnetic sensing method for a scanning mirror, comprising:

rotating a permanent magnet and a wire coil relative to each other as the scanning mirror rotates, 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;
measuring an induced voltage in the wire coil caused by the relative rotation;
and
determining, by at least one controller, a rotation angle of the scanning mirror based on the induced voltage in the wire coil.

1 more element

Dependencies are inferred from the claim text.

Facts

Application

17/192,697Filed 4 Mar 2021

Published

US 2022/0282965 A18 Sep 2022

Granted

11 Jun 2024

Term ends

Not estimatedThe source records don’t support an estimate.

Classification12 codes

G01B 7/30
Measuring arrangements characterised by the use of electric or magnetic techniques: for measuring angles or tapers; for testing the alignment of axes
G01D 5/2013
By influencing the self-induction of one or more coils: by a movable ferromagnetic element, e.g. a core
G01S 7/4817
Constructional features, e.g. arrangements of optical elements: relating to scanning
G01S 17/08
Systems determining position data of a target: for measuring distance only

Magnetic sensing for a scanning mirror in LiDAR system

Life of this patent

Magnetic sensing for a scanning mirror in LiDAR system

Life of this patent

Abstract

Claims20