Method of and apparatus for measuring flow velocity by using ultrasonic waves
US4930358A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Mar 21, 1988 |
| Grant date | Jun 5, 1990 |
| Priority date | — |
| Expiry date | Mar 21, 2008 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG01H5/00
- WIPO fieldMeasurement
- WIPO sectorInstruments
Abstract
The present invention relates to a method of and an apparatus for measuring flow velocity by using ultrasonic waves. Sound velocities of wedge portions constituting ultrasonic transducers provided at the upstream and the downstream sides of a piping, respectively, are measured, and the ultrasonic wave is oscillated from the upstream side to the downstream side and from the downstream side to the upstream side, respectively, and propagated in a fluid in the piping and respective times from the oscillating to receiving are measured. These measured values are substituted into a predetermined function and calculated, to thereby search the flow velocity of the fluid in the piping. Each of the ultrasonic transducers is connected thereto with a transmission-reception changeover section, a timer device for measuring a propagation time, during which the ultrasonic wave is propagated in the fluid in the piping and received, and an operational device for processing output data, which is delivered from the timer device in a predetermined manner. An opening length of the ultrasonic transducer in contact with the piping is about 15 wave lengths or more of a center frequency used, whereby the ult…
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.