Ultrasonic measuring device
US4424715A · kind A · utility
Assignee
Inventor
Key dates
| Filing date | Jun 22, 1981 |
| Grant date | Jan 10, 1984 |
| Priority date | — |
| Expiry date | Jun 22, 2001 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG01N2291/02836
- WIPO fieldMeasurement
- WIPO sectorInstruments
Abstract
The apparatus herein relates to an ultrasonic measuring device having a quadrupole circuit unit. Two ultrasonic converter circuits are alternately and complementary operable as transmitter and receiver circuits and have terminals on opposite sides of the quadrupole circuit unit. The quadrupole circuit unit has a transmission signal generator on the input side thereof and a receiver amplifier on the output side thereof. This kind have a zero point displacement which becomes noticeable by the fact that during a measurement in static liquid the measured signal has different values depending on the direction. As only one transmission signal generator and only one receiver amplifier are used, these values cannot be eliminated as is possible in the case of known constructions with two transmitters. This problem is dealt with by forming substantially equal terminating impedances of the quadrupole formed by both ultrasonic conveyor circuits and by providing the transmission signal generator in the form of a current generator.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.