AGC Amplifier for ultrasonic measuring system
US4402231A · kind A · utility
Assignee
Inventor
Key dates
| Filing date | Apr 9, 1981 |
| Grant date | Sep 6, 1983 |
| Priority date | — |
| Expiry date | Apr 9, 2001 |
Classification
- Technology area (CPC Y)Emerging Cross-Sectional Technologies
- CPC primaryY10S73/90
- WIPO fieldMeasurement
- WIPO sectorInstruments
Abstract
An ultrasonic flow rate measuring system in which a pulse of ultrasonic energy is emitted by a transducer placed on a pipe conducting the fluid to be metered, the energy being propagated through the fluid and being picked up by a second transducer at a different pipe position. The received signal burst includes a first pulsatory swing whose amplitude differs from subsequent swings, the signal burst being applied to the input of an amplifier having automatic-gain control. A clamp circuit coupled to the amplifier input is rendered operative immediately after the first swing is yielded in the amplifier output, the clamp acting to ground the input whereby the operative control level and the resultant gain of the amplifier is determined solely by the first swing.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.