公开(公告)号：US20240019318A1

公开(公告)日：2024-01-18

申请号：US18304197

申请日：2023-04-20

Applicant: Apple Inc.

Inventor： Krishna Prasad Vummidi Murali ,  Patrick R. Gill ,  Chaitanya Mudivarthi ,  Roberto M Ribeiro ,  Mohammad Waleed Shinwari ,  Flavius Pop ,  Michael A Lehr

IPC: G01K11/24

CPC classification number: G01K11/24 ,  H10N30/302

Abstract: An electronic device may include one or more ultrasonic temperature sensors. The ultrasonic temperature sensors may be formed in openings or cavities in a housing of the electronic device. The ultrasonic temperature sensors may include ultrasonic transmitters that transmit signals at different ultrasonic frequencies and ultrasonic receivers that receive the transmitted signals. Phase differences between the received ultrasonic signals may be used to determine the speed of sound of ambient air and therefore calculate the temperature of the ambient air. The ultrasonic transmitters and receivers may include piezoelectric micromachined ultrasound transducers (PMUTs). Each transmitter and receiver may be a dedicated transmitter or receiver, or may transmit and receive ultrasonic signals. Each receiver may include an array of PMUTs that receive ultrasonic signals of different frequencies. The PMUTS may be formed on complementary metal-oxide semiconductors (CMOS).