Flow meter
US6644128B1 · kind B1 · utility
6Cited by
2References
9Claims
0Family size
Assignee
Inventors
Key dates
| Filing date | Mar 15, 2001 |
| Grant date | Nov 11, 2003 |
| Priority date | — |
| Expiry date | Mar 15, 2021 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG01N21/171
- WIPO fieldMeasurement
- WIPO sectorInstruments
Abstract
A photoacoustic effect is used in order to measure a flow rate of a flowing medium (M), in particular of natural gas. A light emitter (1) is used to produce in the medium (M) a sound wave (S) which is transmitted by the medium (M) and detected by a sound detector (2). The light emitter (1) is less exposed to the medium (M) than a diaphragm such as used in the ultrasonic method.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.