Login| Sign Up| Help| Contact|

Patent Searching and Data


Title:
ULTRASONIC WAVE TRANSMITTER, PROPAGATION TIME MEASUREMENT DEVICE, GAS CONCENTRATION MEASUREMENT DEVICE, PROPAGATION TIME MEASUREMENT PROGRAM, AND PROPAGATION TIME MEASUREMENT METHOD
Document Type and Number:
WIPO Patent Application WO/2019/069803
Kind Code:
A1
Abstract:
The purpose of the present invention is to improve the precision of measuring the propagation time of ultrasonic waves. A gas concentration measurement device comprises: a transmission circuit 38 and a transmission oscillator 16 for transmitting first ultrasonic waves in a concentration measurement space and also transmitting second ultrasonic waves, which continue temporally from the first ultrasonic waves in the concentration measurement space; a reception oscillator 18 and a reception circuit 40 for receiving the ultrasonic waves that have propagated through the concentration measurement space; and a propagation time measurement unit 32 for determining, on the basis of the timings at which the first ultrasonic waves and the second ultrasonic waves were transmitted and the timings at which the first ultrasonic waves and the second ultrasonic waves were received, the time in which ultrasonic waves propagate through the concentration measurement space. The second ultrasonic waves have an opposite phase with respect to that of the first ultrasonic waves, and the amplitude of the second ultrasonic waves is greater than that of the first ultrasonic waves.

Inventors:
TSUJIYA KOUICHI (JP)
SHINFUKU YOSHIFUMI (JP)
TORIYAMA YASUHIRO (JP)
Application Number:
PCT/JP2018/036245
Publication Date:
April 11, 2019
Filing Date:
September 28, 2018
Export Citation:
Click for automatic bibliography generation   Help
Assignee:
JAPAN RADIO UEDA CO LTD (JP)
JAPAN RADIO CO LTD (JP)
NISSHINBO HOLDINGS INC (JP)
International Classes:
G01N29/024; G01M3/24; G01N29/44
Foreign References:
JP2000249691A2000-09-14
JP2002131427A2002-05-09
JPH0961523A1997-03-07
JP2002214203A2002-07-31
JPH03223669A1991-10-02
JPH08254454A1996-10-01
JPH09127244A1997-05-16
JPH09184716A1997-07-15
JP2007187506A2007-07-26
Other References:
See also references of EP 3693729A4
Attorney, Agent or Firm:
YKI INTELLECTUAL PROPERTY ATTORNEYS (JP)
Download PDF:
View/Download PDF      PDF Help



 
Previous Patent: POLYURETHANE RESIN, MOLDED ARTICLE, AND METHOD FOR PRODUCING POLYURETHANE RESIN

Next Patent: PROPAGATION TIME MEASUREMENT MACHINE, GAS CONCENTRATION MEASUREMENT DEVICE, PROPAGATION TIME MEASURE...