Mode suppression in fluid flow measurement
US5493916A · kind A · utility
Assignee
Inventor
Key dates
| Filing date | Feb 2, 1994 |
| Grant date | Feb 27, 1996 |
| Priority date | — |
| Expiry date | Feb 2, 2014 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG01S15/582
- WIPO fieldMeasurement
- WIPO sectorInstruments
Abstract
Disclosed is a method and apparatus with which errors caused by the propagation of high order accoustic modes in ultrsonic flow measurement are reduced. Accoustic wave packets are transmitted between two transducers (1,2) arranged in a duct (3). A ringaround transmission technique is used and implemented by a control device (4) in which every fourth wave packet is inverted with respect to the preceding packets in order to annul the propagation effects of high order modes in the duct (3). This permits increased accuracy in the detection of reception of the wave packets by the transducers (1,2) enabling increased accuracy in flow velocity measurment.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.