公开(公告)号：US20240003671A1

公开(公告)日：2024-01-04

申请号：US18202813

申请日：2023-05-26

Applicant: Apple Inc.

Inventor： Mingzhou Jin ,  Tong Chen ,  William Whitney

IPC: G01B9/02001 ,  G01B9/02

CPC classification number: G01B9/02001 ,  G01B9/02092 ,  G01B9/02094

Abstract: An electronic device including an SMI sensor may be operated to predict interference in an SMI signal caused by speckle provided by the SMI sensor and operate the SMI sensor based on predicted interference in the SMI signal caused by speckle. Predicting interference in the SMI signal caused by speckle and operating the SMI sensor accordingly may allow for accurate measurement of physical phenomena using the SMI sensor with reduced power consumption.

公开(公告)号：US20230070733A1

公开(公告)日：2023-03-09

申请号：US17471068

申请日：2021-09-09

Applicant: Apple Inc.

Inventor： William Whitney ,  Mengshu Huang

IPC: G01B9/02 ,  G01S7/4912 ,  G01S17/58

Abstract: A method of estimating a velocity of an object using an SMI sensor. The method includes driving a light emitter of the SMI sensor with a chirped waveform. The chirped waveform includes a first chirp and a second chirp separated by a first time interval, and a third chirp separated from the second chirp by a second time interval. The method also includes deriving a frequency-based velocity from an output of the SMI sensor; generating a first comb of possible velocities in response to analyzing an output of the SMI sensor generated in response to the first chirp and the second chirp; generating a second comb of possible velocities in response to analyzing an output of the SMI sensor generated in response to the second chirp and the third chirp; and determining a velocity of the object using the first comb, the second comb, and the frequency-based velocity.