Title:
ULTRASONIC FLOWMETER AND ULTRASONIC FLOWMETERING METHOD
Document Type and Number:
WIPO Patent Application WO/2003/100357
Kind Code:
A1
Abstract:
An ultrasonic flowmeter (10) comprises a trigger oscillating apparatus (14); a pulser receiver (16); a transducer (20) responsive to an electric signal from the pulser receiver (16) for emitting ultrasonic pulses toward a measurement line (ML) within a fluid pipe (22); signal processing means (27) for processing an ultrasonic echo signal that is a reflected wave from the transducer (20); flow velocity distribution calculating means (28) for analyzing the processed ultrasonic echo signal to determine the position and velocity of the ultrasonic reflecting body along the measurement line (ML); and flow rate calculating means (29). The signal processing means (27) comprises a filtering part (21) for filtering the ultrasonic echo signal, and an AD converter (17) for performing AD conversion. The trigger oscillating apparatus (14) is adapted to control the timings of signal transmission/reception between the pulser receiver (16) and the AD converter (17), and also adapted to have a predetermined wait time after causing the ultrasonic pulse oscillation and ultrasonic echo signal reception to successively occur a plurality of times. This structure can precisely flowmeter not only fluids that could be conventionally flowmetered but also fluids that are relatively clean and hence conventionally difficult to flowmeter.
Inventors:
HISHIDA KOICHI (JP)
TAKEDA YASUSHI (JP)
MORI MICHITSUGU (JP)
TAKEDA YASUSHI (JP)
MORI MICHITSUGU (JP)
Application Number:
PCT/JP2003/006421
Publication Date:
December 04, 2003
Filing Date:
May 22, 2003
Export Citation:
Assignee:
TOKYO ELECTRIC POWER CO (JP)
HISHIDA KOICHI (JP)
TAKEDA YASUSHI (JP)
MORI MICHITSUGU (JP)
HISHIDA KOICHI (JP)
TAKEDA YASUSHI (JP)
MORI MICHITSUGU (JP)
International Classes:
G01F1/66; G01F1/712; G01P5/00; G01P5/24; G01S15/58; (IPC1-7): G01F1/66; G01P5/00
Foreign References:
| JP2000097742A | 2000-04-07 | |||
| JPH0587608A | 1993-04-06 |
Other References:
See also references of EP 1500910A4
None
None
Attorney, Agent or Firm:
Hatano, Hisashi (2nd Floor Miyata Building, 17-16,
Nishi-Shimbashi 1-Chom, Minato-Ku Tokyo, JP)
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