US4596007A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Interferometric sonar in non-linear acoustics
Assignee: Thales SA
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Filing: 1983-10-12
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Granted: 1986-06-17
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Expires: 2003-10-12
Abstract
Abstract An interferometric sonar in non-linear acoustics for high-resolution observations of objects located in the vicinity of the sea floor includes two end transducers for simultaneous transmission at two high frequencies F 1 and F 2 of the order of 200 kHz. Reception is performed by hydrophones placed between the sending transducers at the low frequency F 2 -F 1 of the order of 20 kHz. Angular channels are formed during two transmission sequences. Transmission takes place in phase at the frequency F 2 -F 1 in one sequence and in phase opposition in the other sequence in the case of the two sources generated by non-linear effects.
Inventors
- 👤 Georges Grall
- 👤 Francois Peynaud
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-30 23:39
CPC Classifications
G; G01; G01S; G01S15/00; G01S15/87; G01S15/02; G01S15/88; G01S15/89; G01S15/8906; G01S15/8909; G01S7/00; G01S7/52; G01S7/52003; G10; G10K; G10K11/00; G10K11/18; G10K11/26; G10K11/34; G10K11/341; G10K11/343; G01N; G01N2291/00; G01N2291/02; G01N2291/024; G01N2291/02491
Claims Analysis
Total Claims: 8
Claim 1
Independent Claim
117 words
An interferometric sonar in non-linear acoustics comprising: a sending transducer array including two transducers spaced at a distance L; means for supplying said two transducers with a first high frequency F 1 in phase and with a second high frequency F 2 alternately in phase and in phase opposition in which case said transducer array has an interferometric pattern which exhibits a set of peak values; a receiving transducer array having an array of transducers uniformly spaced between the sending transducers; and means for detecting the signals at a difference low-frequency F 1 -F 2 which are received by the receiving transducer array, and for forming low-frequency channels centered on said peak values of the interferometric pattern.
Claim 2
Dependent Claim
117 words
An interferometric sonar in non-linear acoustics comprising: a sending transducer array including two transducers spaced at a distance L; means for supplying said two transducers with a first high frequency F 1 in phase and with a second high frequency F 2 alternately in phase and in phase opposition in which case said transducer array has an interferometric pattern which exhibits a set of peak values; a receiving transducer array having an array of transducers uniformly spaced between the sending transducers; and means for detecting the signals at a difference low-frequency F 1 -F 2 which are received by the receiving transducer array, and for forming low-frequency channels centered on said peak values of the interferometric pattern.
Claim 3
Dependent Claim
25 words
A sonar according to claim 1, wherein the sending transducers have a length l and the distance L is substantially greater than said length l.
Claim 4
Dependent Claim
27 words
A sonar according to claim 1 further including visual display means, coupled to said means for detecting, for displaying an image representing signals of said low-frequency channels.
Claim 5
Dependent Claim
75 words
A sonar according to claim 3, wherein said receiving transducer array includes a number of transducers sufficient to form high-frequency channels, said means for forming the low-frequency channels is connected to a subassembly of said sending transducers, said receiving transducer array includes means connected to all the receiving transducers for detecting high-frequency signals and forming high-frequency channels, and said visual display means includes means for simultaneously displaying images corresponding to the low-frequency and high-frequency channels.
Claim 6
Dependent Claim
36 words
A sonar according to claim 4, wherein the visual display means make it possible to display the images corresponding to the low-frequency channels and high-frequency channels respectively in different colors and with a small angular shift.
Claim 7
Dependent Claim
21 words
A sonar according to claim 3, wherein the visual display means also displays signals delivered by a separate high-frequency interferometric sonar.
Claim 8
Dependent Claim
23 words
A sonar according to claim 3, wherein the visual display means displays signals delivered by a separate high-frequency sonar of a non-interferometric type.
References Cited (Backward Citations)
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1989-06-16 | 1989-12-16 | 1990-06-17 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1993-06-16 | 1993-12-16 | 1994-06-17 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1997-06-16 | 1997-12-16 | 1998-06-17 | $7700.00 | Window Closed / Lapsed |