Anti-parallel tag flow measurement system
US6826965B1 · kind B1 · utility
Assignee
Inventor
Key dates
| Filing date | Oct 30, 2000 |
| Grant date | Dec 7, 2004 |
| Priority date | — |
| Expiry date | Dec 7, 2020 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG01F25/13
- WIPO fieldMeasurement
- WIPO sectorInstruments
Abstract
A tag flow measurement system wherein a first and a second measurement path are provided across a flowing fluid, and a receiver in each path receives signals modulated by scatters in the fluid. The direction of signal propagation in one path faces in an opposite sense to, e.g., is anti-parallel to, the direction of propagation in the other path, and the two receiver outputs are correlated to determine a time interval representative of flow velocity. In one embodiment each path is defined by a transmitter on one side of the conduit and a receiver on the other side of the conduit, and the positions or orientations of transmitter and receiver are reversed in the second pair. Thus, the first transmitter may lie on the same side of the conduit as the second receiver, and the second transmitter may lie on the same side of the conduit as the first receiver. Diametral or chordal paths may be used. A prototype clamp on system detects flowing air at atmospheric pressure in a schedule 40 one inch steel pipe over an extended range, at flow rates as low as several meters per second. The coherent crosstalk between one transmitter and the receiver of the other pair is greatly reduced, and travels…
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.