Title:
超音波流量計
Document Type and Number:
Japanese Patent JP4075526
Kind Code:
B2
Abstract:
To provide a precise flow meter.
A transmission-side ultrasonic converter 23 (or 24) is driven at a plurality of frequencies to transmit ultrasonic waves. A plurality of zero-cross points of received waveforms received at a reception-side ultrasonic converter 24 (or 23) are detected while a trigger level is sequentially updated to determine a true ultrasonic wave propagation time Ts. The quantity of flow of a fluid is computed through the use of the determined time to accurately measure the flow velocity of the fluid and implement the precise flow meter.
COPYRIGHT: (C)2004,JPO
Inventors:
Kenzo Huangji
Yuji Nakabayashi
Yuji Nakabayashi
Application Number:
JP2002248248A
Publication Date:
April 16, 2008
Filing Date:
August 28, 2002
Export Citation:
Assignee:
Matsushita Electric Industrial Co., Ltd
International Classes:
G01F1/66
Domestic Patent References:
| JP5034193A | ||||
| JP2000298048A |
Other References:
液体用超音波微小流量計のセンサ配置と流量特性,計測自動制御学会論文集 第36巻 第12号,日本,社団法人計測自動制御学会,2000年12月31日,第36巻 第12号,p.1071~1078
Attorney, Agent or Firm:
Fumio Iwahashi
Hiroki Naito
Daisuke Nagano
Hiroki Naito
Daisuke Nagano