US 12,585,013 B2Granted

Displacement detection device and method

AssigneeMurata Manufacturing Co., Ltd.

InventorsYuuma Watabe, Takaaki Asada, Shinichi Sasaki

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Abstract

A displacement detection device includes a transmitter, a receiver, and a controller configured or programmed to output a first transmission signal to the transmitter to transmit a modulated wave and acquire a responsive first reception signal in a first measurement period, extract first phase information indicating a phase defined in a correlation between a first transmission signal and a reception signal, output a second transmission signal to the transmitter and acquire a responsive second reception signal in a second measurement period after the first measurement period, extract second phase information indicating a phase defined in a correlation between the second transmission signal and reception signal, and detect a displacement of an object between the first and second measurement periods, depending on a difference between the first and second phase information.

Claims17

Dependent claims

A displacement detection device comprising:

a transmitter to transmit, to an object, a modulated wave including a plurality of frequencies;
a receiver to receive a reflection wave from the object and generate a reception signal indicating a reception result;
and
a controller configured or programmed to control transmission of the modulated wave by the transmitter and acquire the reception signal from the receiver;
wherein
the controller is configured or programmed to:
output a first transmission signal to the transmitter to transmit the modulated wave and acquire a responsive first reception signal in a first measurement period;
extract, based on the first transmission signal and the first reception signal, first phase information indicating a phase defined in a correlation between the first transmission signal and the first reception signal;
output a second transmission signal to the transmitter to transmit the modulated wave and acquire a responsive second reception signal in a second measurement period after the first measurement period;
extract, based on the second transmission signal and the second reception signal, second phase information indicating a phase defined in a correlation between the second transmission signal and the second reception signal;
and
detect a displacement of the object between the first and second measurement periods, depending on a difference between the first phase information and the second phase information.

9 more elements

A displacement detection method comprising, by a controller to control a transmitter to transmit, to an object, a modulated wave including a plurality of frequencies and acquire, from a receiver to receive a reflection wave from the object, a reception signal indicating a reception result:

outputting a first transmission signal to the transmitter to transmit the modulated wave and acquiring a responsive first reception signal in a first measurement period;
extracting, based on the first transmission signal and the first reception signal, first phase information indicating a phase defined in a correlation between the first transmission signal and the first reception signal;
outputting a second transmission signal to the transmitter to transmit the modulated wave and acquiring a responsive second reception signal in a second measurement period after the first measurement period;
extracting, based on the second transmission signal and the second reception signal, second phase information indicating a phase defined in a correlation between the second transmission signal and the second reception signal;
and
detecting a displacement of the object between the first and second measurement periods, depending on a difference between the first phase information and the second phase information.

3 more elements

Dependencies are inferred from the claim text.

Facts

Application: 18/536,530Filed 12 Dec 2023 · continuation
Priority: JP 2021-1471079 Sep 2021
Published: US 2024/0118415 A111 Apr 2024
Granted: 24 Mar 2026
Term ends: Not estimatedThe source records don’t support an estimate.

Classification11 codes

G01S 15/104
Using transmission of pulses having some particular characteristics: wherein the transmitted pulses use a frequency- or phase-modulated carrier wave
G01S 15/62
Velocity or trajectory determination systems; Sense-of-movement determination systems: sense-of-movement determination
A61B 8/08
Diagnosis using ultrasonic, sonic or infrasonic waves: clinical applications
G01S 7/521
Of systems according to group G01S15/00: constructional features