Ultrasonic measurement system with chordal path
US6463808B1 · kind B1 · utility
Inventor
Key dates
| Filing date | Oct 4, 1999 |
| Grant date | Oct 15, 2002 |
| Priority date | — |
| Expiry date | Oct 4, 2019 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG01F1/667
- WIPO fieldMeasurement
- WIPO sectorInstruments
Abstract
Flow is described by first variables related to a coordinate system, and by at least one second flow-related variable such as friction factor or Reynolds number unrelated to the coordinate system, wherein the first variables are separable or substantially separable from the second variables. The method includes determining average velocities of the fluid on two paths, or taking a first path measurement and at least one point measurement, selected such that combining the first path measurement and the second measurement forms an expression independent of the second variable. In one embodiment, first and second path measurements are combined in accordance with the velocity relationships given by the Pao equation to produce a flow measurement which is independent of the friction factor. A single calibration then allows the meter to be used on diverse conduits with different wall roughness or friction factor. The system also yields a non-invasive measure of the friction factor. A conventional flow meter may be set up by solving for flow profile and analytically determining a meter factor or appropriate measurement path. The measurements may be combined to eliminate the second variable,…
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.