Title:
ULTRASONIC FLOW RATE MEASUREMENT DEVICE
Document Type and Number:
WIPO Patent Application WO/2011/161873
Kind Code:
A1
Abstract:
Disclosed is an ultrasonic flow rate meter that can detect and correct temperature, without the use of a thermistor or other special temperature measurement sensor. The ultrasonic flow rate meter comprises a first ultrasonic oscillator (12) and a second ultrasonic oscillator (13) that are positioned on a flow rate measurement unit (11) such that ultrasonic waves are transmitted by one oscillator and received by the other; a counter (17) for measuring the propagation time transferred between the first and second ultrasonic oscillators (12, 13); a flow rate calculation unit (19) that calculates the flow rate based on the measurement value of the counter (17); an oscillation circuit (16) used as a time counter when calculating the propagation time with the counter (17); and a temperature detection unit (20) that detects temperature by using frequency variation caused by the temperature of the oscillation circuit (16).
Inventors:
SATOU, Masato (())
佐藤 真人 (())
FUJII, Yuji (())
佐藤 真人 (())
FUJII, Yuji (())
Application Number:
JP2011/002820
Publication Date:
December 29, 2011
Filing Date:
May 20, 2011
Export Citation:
Assignee:
Panasonic Corporation (1006, Oaza Kadoma Kadoma-sh, Osaka 01, 〒5718501, JP)
パナソニック株式会社 (〒01 大阪府門真市大字門真１００６番地 Osaka, 〒5718501, JP)
SATOU, Masato (())
佐藤 真人 (())
パナソニック株式会社 (〒01 大阪府門真市大字門真１００６番地 Osaka, 〒5718501, JP)
SATOU, Masato (())
佐藤 真人 (())
International Classes:
G01F1/66; G01F15/04
Attorney, Agent or Firm:
OGURI, Shohei et al. (Eikoh Patent Firm, Toranomon East Bldg. 10F 7-13, Nishi-Shimbashi 1-chome, Minato-k, Tokyo 03, 〒1050003, JP)
Claims:
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