Title:
ULTRASONIC FLOWMETER
Document Type and Number:
Japanese Patent JP2015132488
Kind Code:
A
Abstract:
PROBLEM TO BE SOLVED: To provide an ultrasonic flowmeter capable of detecting abnormality such as a measurement error, etc., with high accuracy, even when there is a change in a measurement fluid or temperature.SOLUTION: An ultrasonic flowmeter comprises: a characteristic value calculation unit 6 for calculating a value A by A=1/t1+1/t2 from a propagation time t1 of an ultrasonic wave from a first ultrasound transducer 1a to a second ultrasound transducer 1b and a propagation time t2 from the second ultrasound transducer 1b to the first ultrasound transducer 1a, and making the calculated value a characteristic value; a memory unit 9 having a signal intensity detection unit 7 for detecting the intensity of an ultrasonic wave signal and/or a temperature detection unit 8 for detecting a fluid temperature, and preserving the signal intensity detected by the signal intensity detection unit 7 and/or the fluid temperature detected by the temperature detection unit 8 and the characteristic value calculated by the characteristic value calculation unit 6; a determination condition generation unit 10 for generating an abnormality determination condition from the data stored in the memory unit 9; and an abnormality determination unit 11 for determining abnormality from the abnormality determination condition and the characteristic value stored in the memory unit 9.
Inventors:
NAGAHARA HIDETOMO
NAKABAYASHI YUJI
SHIRASAWA TADANORI
NAKABAYASHI YUJI
SHIRASAWA TADANORI
Application Number:
JP2014002895A
Publication Date:
July 23, 2015
Filing Date:
January 10, 2014
Export Citation:
Assignee:
PANASONIC IP MAN CORP
International Classes:
G01F1/66; G01F1/00
Domestic Patent References:
JP2007003131A | 2007-01-11 | |||
JP2005241581A | 2005-09-08 | |||
JP2013088322A | 2013-05-13 | |||
JP2008111696A | 2008-05-15 | |||
JP2010223855A | 2010-10-07 | |||
JPH11108720A | 1999-04-23 | |||
JP2008020187A | 2008-01-31 |
Foreign References:
US20150107370A1 | 2015-04-23 | |||
WO2013172029A1 | 2013-11-21 |
Attorney, Agent or Firm:
Kentaro Fujii
Kenji Kamada
Hiroo Maeda
Kenji Kamada
Hiroo Maeda