Title:
ULTRASONIC DISTANCE MEASUREMENT DEVICE AND ULTRASONIC DISTANCE MEASUREMENT METHOD
Document Type and Number:
WIPO Patent Application WO/2019/188661
Kind Code:
A1
Abstract:
The present invention is capable of highly accurate distance measurement. The present invention transmits ultrasound on the basis of a transmission signal in which the frequency becomes zero after a square wave having a fixed period and a first number of cycles from approximately 10 to 15, and receives ultrasound reflected by an object. The present invention measures the distance between a sensor and the object on the basis of the correlation between an ultrasound reception waveform received by the sensor and a template that is either a first waveform in which a second number of cycles less than the first number of cycles from the start of a base waveform that is a reception waveform under prescribed conditions are extracted or a second waveform resulting from multiplying the amplitude of the first waveform by a prescribed factor.
Inventors:
YONEZAWA MAKOTO (JP)
Application Number:
PCT/JP2019/011701
Publication Date:
October 03, 2019
Filing Date:
March 20, 2019
Export Citation:
Assignee:
V TECH CO LTD (JP)
International Classes:
G01B17/00; G01S15/08
Foreign References:
| JP2014232068A | 2014-12-11 | |||
| JP2009222445A | 2009-10-01 | |||
| US20030112705A1 | 2003-06-19 |
Attorney, Agent or Firm:
SAKATA Yukari (JP)
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