Title:
ULTRASONIC FLOWMETER
Document Type and Number:
Japanese Patent JP3821571
Kind Code:
B2
Abstract:
PROBLEM TO BE SOLVED: To improve the S/N of the detecting signal of an ultrasonic flowmeter by suppressing ghost signal components directly received by means of receivers from transmitters with a simple constitution.
SOLUTION: Detector attaching sections 2 and 2 are respectively welded to the upstream and downstream sides of a flow tube 1 at a prescribed inclined angle and detectors 4 and 4 are respectively put in the attaching sections 2 and 2. An ultrasonic pulse is propagated between the detectors 4 and 4 by a reflecting method and the time required for propagating the pulse is alternately measured by alternately using the detectors 4 and 4 as transmitters and receivers. An ultrasonic flowmeter measures the flow rate of a fluid from the difference in propagating time. When the pulse is propagated, ghost signals are directly received by the receivers from the transmitters without passing through normal routes produced by the reflection. In order to improve the S/N of the detecting signal of the flowmeter by suppressing the generation of the ghost signals, the upstream detector 4 facing the flow passage is installed in such a position that the detecting end 6 of the detector 4 is separated from the flow passage.
Inventors:
Tetsuya Kawada
Daiichi Kitami
Daiichi Kitami
Application Number:
JP7068998A
Publication Date:
September 13, 2006
Filing Date:
March 19, 1998
Export Citation:
Assignee:
Oval Co., Ltd.
International Classes:
G01F1/66; (IPC1-7): G01F1/66
Domestic Patent References:
| JP63265117A | ||||
| JP54053476U | ||||
| JP9287989A | ||||
| JP63019216U |
Attorney, Agent or Firm:
Akinaka Takano
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