US4640292A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Extending sample volume in pulsed Doppler systems
Assignee: HP Inc
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Filing: 1986-02-10
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Granted: 1987-02-03
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Expires: 2006-02-10
Abstract
Abstract The sampling volume of a pulsed Doppler system is increased to a length greater than that corresponding to one pulse by sampling the reflections of each launched pulse a plurality of successive times and accumulating the samples.
Inventors
- 👤 Alexander Tykulsky
- 👤 Karl E. Thiele
- 👤 Leslie I. Halberg
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-05 22:55
CPC Classifications
A; A61; A61B; A61B8/00; A61B8/06; G; G01; G01P; G01P5/00; G01P5/24; G01P5/241; G01P5/244
Claims Analysis
Total Claims: 6
Claim 1
Independent Claim
155 words
A method for operating an ultrasonic pulsed Doppler system in such manner as to obtain the velocity distribution of scatterers along the path of the Doppler pulse and within a volume having a length along the line of propagation of the pulse that is greater than the length of the sample volume, defined by the length of said Doppler pulse, along the line of propagation, comprising the steps of: launching pulses of alternating waves at a given rate into a medium containing the scatterers, obtaining a plurality of samples of the reflections of each launched pulse at respectively successive times so that each sample is of the reflections of scatterers contained in a different sample volume, accumulating said samples so as to derive an accumulated sample to which all samples contribute, and coupling the accumulated sample to processing means therefor to provide a signal representative of Doppler shift encompassed by all said different sample volumes.
Claim 2
Independent Claim
155 words
A method for operating an ultrasonic pulsed Doppler system in such manner as to obtain the velocity distribution of scatterers along the path of the Doppler pulse and within a volume having a length along the line of propagation of the pulse that is greater than the length of the sample volume, defined by the length of said Doppler pulse, along the line of propagation, comprising the steps of: launching pulses of alternating waves at a given rate into a medium containing the scatterers, obtaining a plurality of samples of the reflections of each launched pulse at respectively successive times so that each sample is of the reflections of scatterers contained in a different sample volume, accumulating said samples so as to derive an accumulated sample to which all samples contribute, and coupling the accumulated sample to processing means therefor to provide a signal representative of Doppler shift encompassed by all said different sample volumes.
Claim 3
Dependent Claim
19 words
A method such as set forth in claim 1 in which the samples are weighted before they are accumulated.
Claim 4
Dependent Claim
145 words
In an ultrasonic pulsed Doppler system, apparatus for deriving the velocity distribution of scatterers along the path of the Doppler pulse and with a volume having a dimension along the path of propagation of the pulses that is greater than the corresponding dimension of the sample volume, defined by the length of said Doppler pulse, comprising means for launching pulses of alternating waves at a given rate into a medium containing scatterers, means for obtaining a plurality of samples of the reflections of each launched pulse at respectively successive times so that each sample is of the reflection of scatterers contained in a different sample volume, means for accumulating said samples so as to derive an accumulated sample to which all samples contribute, and means for processing the accumulated sample to provide a signal representative of Doppler shift encompassed by all said different sample volumes.
Claim 5
Dependent Claim
145 words
In an ultrasonic pulsed Doppler system, apparatus for deriving the velocity distribution of scatterers along the path of the Doppler pulse and with a volume having a dimension along the path of propagation of the pulses that is greater than the corresponding dimension of the sample volume, defined by the length of said Doppler pulse, comprising means for launching pulses of alternating waves at a given rate into a medium containing scatterers, means for obtaining a plurality of samples of the reflections of each launched pulse at respectively successive times so that each sample is of the reflection of scatterers contained in a different sample volume, means for accumulating said samples so as to derive an accumulated sample to which all samples contribute, and means for processing the accumulated sample to provide a signal representative of Doppler shift encompassed by all said different sample volumes.
Claim 6
Dependent Claim
23 words
Apparatus as set forth in claim 3 wherein means are provided for weighting the samples before they are applied to the accumulating means.
References Cited (Backward Citations)
DE133040C
Cited
US4104912A
Cited
US4067236A
Cited
US4413630A
Cited
US4413630B1
Cited
US4103679A
Cited
US4217909A
Cited
US4476874A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1990-02-02 | 1990-08-04 | 1991-02-03 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1994-02-02 | 1994-08-04 | 1995-02-03 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1998-02-02 | 1998-08-04 | 1999-02-03 | $7700.00 | Window Closed / Lapsed |