US5175709A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Ultrasonic transducer with reduced acoustic cross coupling
Assignee: Acoustic Imaging Technologies Corp
•
Filing: 1990-10-11
•
Granted: 1992-12-29
•
Expires: 2010-10-11
Abstract
Abstract A continuous wave driven ultrasonic transducer for determining doppler frequency shift in reflected ultrasonic pressure waves in which the transmitter and receiver sections are constructed of a composite core having a plurality of segments of piezoelectric material separated by acoustic suppression material. Also disclosed is a method of reducing acoustic and mechanical cross coupling between piezoelectric transmitter and receiver sections of an ultrasonic transducer by arranging segments of piezoelectric material in a lateral array, and separating the piezoelectric segments with ultrasonic acoustic suppression material to produce a composite transducer core of reduced acoustic and mechanical cross coupling.
Inventors
- 👤 Michael H. Slayton
- 👤 Leroy A. Kopel
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 21:03
CPC Classifications
B; B06; B06B; B06B1/00; B06B1/02; B06B1/06; B06B1/0607; B06B1/0622; B06B1/0629; G; G10; G10K; G10K11/00; G10K11/002
Claims Analysis
Total Claims: 5
Claim 1
Independent Claim
75 words
A continuous wave Doppler transducer comprising: a transmitter having side-by-side segments of piezoelectric material, ultrasonic wave suppression material interposed between the segments, and means for connecting the segments in parallel; a receiver having side-by-side segments of piezoelectric material, ultrasonic wave suppression material interposed between the segments, and means for connecting the segments in parallel; and a non-conductive separation layer interposed between the transmitter and receiver to acoustically and electrically isolate the receiver from the transmitter.
Claim 2
Dependent Claim
75 words
A continuous wave Doppler transducer comprising: a transmitter having side-by-side segments of piezoelectric material, ultrasonic wave suppression material interposed between the segments, and means for connecting the segments in parallel; a receiver having side-by-side segments of piezoelectric material, ultrasonic wave suppression material interposed between the segments, and means for connecting the segments in parallel; and a non-conductive separation layer interposed between the transmitter and receiver to acoustically and electrically isolate the receiver from the transmitter.
Claim 3
Dependent Claim
16 words
The transducer of claim 1, in which the separation layer is thicker than the suppression material.
Claim 4
Independent Claim
142 words
A method of reducing cross coupling in a continuous wave ultrasound Doppler system having a continuous wave ultrasonic oscillator and an ultrasonic wave receiver for detecting Doppler shift comprising the steps of: arranging a first plurality of segments of piezoelectric material in spaced apart side-by-side relationship; interposing ultrasonic wave suppression material between the first plurality of segments; connecting the first plurality of segments in parallel; arranging a second plurality of segments of piezoelectric material in spaced apart side-by-side relationship; interposing ultrasonic wave suppression material between the second plurality of segments; connecting the second plurality of segments in parallel; interposing a non-conductive separation layer between the transmitter and the receiver to acoustically and electrically isolate the receiver from the transmitter; connecting the oscillator to the first plurality of segments in parallel; and connecting the second plurality of segments in parallel to the receiver.
Claim 5
Independent Claim
142 words
A method of reducing cross coupling in a continuous wave ultrasound Doppler system having a continuous wave ultrasonic oscillator and an ultrasonic wave receiver for detecting Doppler shift comprising the steps of: arranging a first plurality of segments of piezoelectric material in spaced apart side-by-side relationship; interposing ultrasonic wave suppression material between the first plurality of segments; connecting the first plurality of segments in parallel; arranging a second plurality of segments of piezoelectric material in spaced apart side-by-side relationship; interposing ultrasonic wave suppression material between the second plurality of segments; connecting the second plurality of segments in parallel; interposing a non-conductive separation layer between the transmitter and the receiver to acoustically and electrically isolate the receiver from the transmitter; connecting the oscillator to the first plurality of segments in parallel; and connecting the second plurality of segments in parallel to the receiver.
References Cited (Backward Citations)
US4672591A
Cited
US4890268A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1995-12-29 | 1996-06-29 | 1996-12-29 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1999-12-29 | 2000-06-29 | 2000-12-29 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2003-12-29 | 2004-06-29 | 2004-12-29 | $7700.00 | Window Closed / Lapsed |