US3859620A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Hydrophone line array calibration unit
Assignee: United States Department of the Navy
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Filing: 1974-01-23
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Granted: 1975-01-07
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Expires: 1994-01-23
Abstract
Abstract An elongate hydrophone array is simultaneously calibrated to ensure the monitoring of accurate, meaningful readings when the invention is subsequently deployed. A cylindrically-shaped wiremesh framework serves as a support for the array and a number of tie lines secure the array on the framework in a helically extending relationship. A coaxially disposed projector of acoustic energy ensonifies the helically coiled hydrophone array and an adjacent reference hydrophone. The reference hydrophone and the hydrophone array are coupled to monitoring circuits which provide a relationship of the reference signals and the array signals to allow a calibration of the array.
Inventors
- 👤 Joseph L Percy
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 23:49
CPC Classifications
G; G01; G01V; G01V13/00; G10; G10K; G10K11/00; G10K11/004; G10K11/006; G10K11/008
Claims Analysis
Total Claims: 8
Claim 1
Independent Claim
87 words
An apparatus for permitting the calibration of an elongate hydrophone array comprising: means for cylindrically supporting said elongate hydrophone array on its inner surface in a helically extending configuration; means disposed adjacent said elongate hydrophone array for providing reference signals; means coaxially mounted in the cylindrically supporting means for ensonifying the helically extending said elongate hydrophone array and the providing means with signals; and means coupled to said helically extending said elongate hydrophone array for monitoring the ensonified signals and the reference signals to allow said calibration.
Claim 2
Independent Claim
87 words
An apparatus for permitting the calibration of an elongate hydrophone array comprising: means for cylindrically supporting said elongate hydrophone array on its inner surface in a helically extending configuration; means disposed adjacent said elongate hydrophone array for providing reference signals; means coaxially mounted in the cylindrically supporting means for ensonifying the helically extending said elongate hydrophone array and the providing means with signals; and means coupled to said helically extending said elongate hydrophone array for monitoring the ensonified signals and the reference signals to allow said calibration.
Claim 3
Dependent Claim
44 words
An apparatus according to claim 1 in which said cylindrically supporting means is a semirigid conductive material for holding said elongate hydrophone array in its helical configuration and said apparatus further includes: means for securing said elongate hydrophone array on said cylindrically supporting means.
Claim 4
Dependent Claim
21 words
An apparatus according to claim 2 in which the securing means is a nonconductive material to avoid interference with said calibration
Claim 5
Dependent Claim
36 words
An apparatus according to claim 3 in which the conductive cylindrically supporting means has a mesh-like construction to reduce reflections of the ensonifying signals and to render the apparatus substantially neutrally buoyant when immersed in water.
Claim 6
Dependent Claim
33 words
An apparatus according to claim 4 further including: means connected to said conductive cylindrically supporting means for suspending said helically extending said elongate hydrophone array in a body of water during said calibration.
Claim 7
Dependent Claim
57 words
An apparatus according to claim 5 further having a transport capability and further including; means disposed at opposite ends of said conductive cylindrically supporting means for protecting said helically extending said elongate hydrophone array and means interposed between portions of the protecting means for spacing said portions to avoid damaging said helically extending said elongate hydrophone array.
Claim 8
Dependent Claim
25 words
An apparatus according to claim 6 further including: means coupled to the protecting means for lifting said helically extending said elongate hydrophone array for relocation.
References Cited (Backward Citations)
US3713084A
Cited
US3740707A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1978-01-06 | 1978-07-08 | 1979-01-07 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1982-01-06 | 1982-07-08 | 1983-01-07 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1986-01-06 | 1986-07-08 | 1987-01-07 | $7700.00 | Window Closed / Lapsed |