Ultrasonic fluid meter with improved resistance to parasitic ultrasound waves
US6526838B1 · kind B1 · utility
Assignee
Inventors
Key dates
| Filing date | Apr 27, 1999 |
| Grant date | Mar 4, 2003 |
| Priority date | — |
| Expiry date | Apr 27, 2019 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG01F1/662
- WIPO fieldMeasurement
- WIPO sectorInstruments
Abstract
The invention provides a fluid meter comprising ultrasound transducers, attenuation means for attenuating parasitic ultrasound waves of wavelength &lgr;, and constituted by at least one passage in which said waves propagate along a main direction corresponding to a longitudinal dimension a of said passage, said passage having a transverse dimension b perpendicular to a and much smaller than the wavelength &lgr; of the parasitic waves in the propagation medium, said passage comprising a plurality of consecutive passage portions each having a part presenting a reduction in transverse propagation section along the dimension b of the passage, the longitudinal dimension of each passage portion being substantially equal to &lgr;/2.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.