Ultrasonic flowmeter
US4603589A · kind A · utility
Assignee
Inventor
Key dates
| Filing date | Dec 27, 1984 |
| Grant date | Aug 5, 1986 |
| Priority date | — |
| Expiry date | Dec 27, 2004 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG01F1/667
- WIPO fieldMeasurement
- WIPO sectorInstruments
Abstract
An ultrasonic flowmeter for ultrasonically measuring physical parameters of a media flowing in a measuring path between two ultrasonic transducer circuits each including transmitting and receiving circuits, each including respective transducers. The measuring path has at least one component in the direction of flow and over which ultrasonic signals are sent alternately upstream and downstream. A detector connected to the receiving circuit operates to detect an envelope curve of the received ultrasonic signal. After detecting the envelope curve of the ultrasonic signal, the zero-crossing point of the envelope curve is determined electrically or arithmetically. The propagation period of ultrasonic waves is developed by defining the zero-crossing point as the beginning of receiving of the ultrasonic signal. Then, the velocity of flow and the volume of flow are calculated based on the propagation periods obtained from the envelope curve of the received ultrasonic signal.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.