US3740707A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Far field signal simulation utilizing cylindrical arrays
Assignee: United States Department of the Navy
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Filing: 1971-06-15
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Granted: 1973-06-19
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Expires: 1991-06-15
Abstract
Abstract A performance monitoring test set having a cylindrical near field multi-stave transducer array which simulates far field conditions. The multi-stave array is housed in a cylindrical test tank with appropriate shading and phasing of the staves to produce a constant pressure volume in the near field. The test tank system permits testing of a sonar system''s range and bearing accuracy, beam uniformity, minimum detectable signal level and transmitter response.
Inventors
- 👤 Brien P O
- 👤 H Messias
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-24 08:39
CPC Classifications
G; G01; G01S; G01S7/00; G01S7/02; G01S7/40; G01S7/4004; G01S7/4017; G01S7/52; G01S7/52004; H; H04; H04B; H04B11/00; Y; Y10; Y10S; Y10S367/00; Y10S367/905
Claims Analysis
Total Claims: 7
Claim 1
Independent Claim
97 words
An electroacoustic transducer array for testing a sonar system comprising: a plurality of staves; a plurality of transducer elements within each stave; each of said staves containing the same number of transducers and the transducers within each stave being spaced the same distance apart; said plurality of staves arranged on a circle of predetermined diameter such that the transducers are aligned and equally spaced both vertically and circumferentially whereby the cylindrical array is acoustically transparent at the operating frequency; and means for shading each of said transducers whereby the cylindrical array has a constant pressure volume near-field.
Claim 2
Dependent Claim
97 words
An electroacoustic transducer array for testing a sonar system comprising: a plurality of staves; a plurality of transducer elements within each stave; each of said staves containing the same number of transducers and the transducers within each stave being spaced the same distance apart; said plurality of staves arranged on a circle of predetermined diameter such that the transducers are aligned and equally spaced both vertically and circumferentially whereby the cylindrical array is acoustically transparent at the operating frequency; and means for shading each of said transducers whereby the cylindrical array has a constant pressure volume near-field.
Claim 3
Dependent Claim
15 words
The electroacoustic transudcer array of claim 1 wherein said transducers are electrically coupled in parallel.
Claim 4
Dependent Claim
17 words
The electroacoustic transducer array of claim 2 wherein said transducers are ceramic cylinders of a preselected size.
Claim 5
Dependent Claim
18 words
The electroacoustic transducer array of claim 1 wherein each stave comprises a sealed, hollow neoprene tube containing oil.
Claim 6
Dependent Claim
21 words
The electroacoustic tRansducer array of claim 1 wherein said shading means includes a capacitor electrically coupled in series with each transducer.
Claim 7
Dependent Claim
47 words
The electroacoustic transducer array of claim 2 wherein the cylindrical array comprises: 24 staves arranged on a circle of approximately 25 inches in diameter; said staves contain nineteen transducer elements spaced 4 inches apart; and said transducer elements consist of 1/2 inch by 1/4 inch ceramic cylinders.
References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1976-06-18 | 1976-12-18 | 1977-06-19 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1980-06-18 | 1980-12-18 | 1981-06-19 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1984-06-18 | 1984-12-18 | 1985-06-19 | $7700.00 | Window Closed / Lapsed |