Method and apparatus for ultrasonic measurements of a medium
US4630482A · kind A · utility
Inventor
Key dates
| Filing date | Jun 17, 1985 |
| Grant date | Dec 23, 1986 |
| Priority date | — |
| Expiry date | Jun 17, 2005 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG01N2291/02881
- WIPO fieldMeasurement
- WIPO sectorInstruments
Abstract
A method and apparatus for measurement of time required for an ultrasonic tone burst to traverse a medium from a transmitter to a receiver is disclosed. Two transducers separated by a distance through which a medium flows alternatively act as a transmitter and then a receiver of ultrasonic signals. After a signal has been emitted from the first ultrasonic transducer, the second transducer is electronically checked for receipt of the ultrasonic signal. That checking is done at certain time intervals, preferably 4 microseconds, over a selected period of time. Samples are taken over each time interval. For each sample time slot the presence and strength of an output signal is measured. An address in a memory is selected which corresponds to each sampling time slot. Each input sample is stored in memory at an address which corresponds to the time slot at which the input sample was taken. This procedure is repeated for several time intervals of the same length using subsequent ultrasonic signals from the transducer. On each subsequent transmission the input samples are combined to the input samples stored in the memory thereby producing a corresponding new process sample at each address…
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.