Pulse doppler flow speed meter
US4955386A · kind A · utility
10Cited by
3References
9Claims
0Family size
Assignee
Inventors
Key dates
| Filing date | Dec 27, 1989 |
| Grant date | Sep 11, 1990 |
| Priority date | — |
| Expiry date | Dec 27, 2009 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG01S15/584
- WIPO fieldMeasurement
- WIPO sectorInstruments
Abstract
A pulse doppler apparatus transmits a ultrasonic sound wave at transmission intervals T and T+Ts alternately and iteratively, detects the phase difference attributable to the doppler shift in the reflected sound wave signal at the interval T and the phase difference in the reflected signal at the interval T+Ts sequentially, detects the difference between both phase differences, and transforms the difference into a doppler frequency. The apparatus includes an MTI filter which exerts the same filtering characteristics on the reflected sound signals at both intervals T and T+Ts.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.