US3864664A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Line hydrophone array element calibrator
Assignee: United States Department of the Navy
•
Filing: 1973-06-25
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Granted: 1975-02-04
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Expires: 1993-06-25
Abstract
Abstract A line hydrophone calibrator having three coaxial units forming an elongated tubular body open at each end. A central calibrator unit has three aligned piezoceramic tubes, two outer tubes producing sound and a center tube sensing the produced sound. the two outer units, fixed to the central unit, are metal sound pressure retaining tubes with sonic resistors disposed along them to dampen standing waves. The inner wall of the elongated body has a rubber tubular lining, the space between the two being filled with de-aerated liquid which may be alternately pressurized to clamp a hydrophone element centrally in the center sound sensing tube and depressurized to allow the array to be moved to test the next element.
Inventors
- 👤 W James Trott
- 👤 Joseph F Zalesak
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-24 09:31
CPC Classifications
G; G10; G10K; G10K11/00; G10K11/004; G10K11/006; G10K11/008; G01; G01V; G01V13/00
Claims Analysis
Total Claims: 15
Claim 1
Independent Claim
62 words
A hydrophone testing system comprising: a tubular unit open at both ends containing means for producing and receiving sound pressure and for receiving a hydrophone to be tested, said means having a sound receiving tube and sound producing tubes located coaxial with and adjacent to each end of said sound receiving tube, said tubular unit being adapted to be submerged in water.
Claim 2
Dependent Claim
62 words
A hydrophone testing system comprising: a tubular unit open at both ends containing means for producing and receiving sound pressure and for receiving a hydrophone to be tested, said means having a sound receiving tube and sound producing tubes located coaxial with and adjacent to each end of said sound receiving tube, said tubular unit being adapted to be submerged in water.
Claim 3
Dependent Claim
35 words
The system of claim 1 further comprising: elastic liner means within said tubular unit and sealed at the outer ends thereof with the space between said linear and said unit being filled with de-aerated liquid.
Claim 4
Dependent Claim
30 words
The system of claim 2 further comprising: de-aerated liquid accumulator means communicating with said space to expand and contract said elastic liner means to centrally clamp and release said hydrophone.
Claim 5
Dependent Claim
24 words
The system of claim 1 further comprising: two elongated tubular sound retaining units each coaxially connected to an opposite end of said tubular unit.
Claim 6
Dependent Claim
44 words
The system of claim 4 further comprising: elastic liner means within said tubular unit and said sound retaining units and sealed at the outer ends of said sound retaining units with the space between the units and the liner being filled with de-aerated liquid.
Claim 7
Dependent Claim
30 words
The system of claim 5 further comprising: de-aerated liquid accumulator means communicating with said space to expand and contract said elastic liner means to centrally clamp and release said hydrophone.
Claim 8
Dependent Claim
23 words
The system of claim 6 further comprising: sonic resistors disposed along the length of said tubular sound retaining units to dampen standing waves.
Claim 9
Dependent Claim
19 words
The system of claim 1 wherein said means for producing and receiving sound pressure is constructed of piezoceramic material.
Claim 10
Dependent Claim
35 words
The system of claim 8 further comprising: elastic liner means within said tubular unit and sealed at the outer ends thereof with the space between said linear and said unit being filled with de-aerated liquid.
Claim 11
Dependent Claim
30 words
The system of claim 9 further comprising: de-aerated liquid accumulator means communicating with said space to expand and contract said elastic liner means to centrally clamp and release said hydrophone.
Claim 12
Dependent Claim
24 words
The system of claim 8 further comprising: two elongated tubular sound retaining units each coaxially connected to an opposite end of said tubular unit.
Claim 13
Dependent Claim
44 words
The system of claim 11 further comprising: elastic liner means within said tubular unit and said sound retaining units and sealed at the outer ends of said sound retaining units with the space between the units and the liner being filled with de-aerated liquid.
Claim 14
Dependent Claim
31 words
The system of claim 12 further comprising: de-aerated liquid accumulator a means communicating with said space to expand and contract said elastic liner means to centrally clamp and release said hydrophone.
Claim 15
Dependent Claim
23 words
The system of claim 13 further comprising: sonic resistors disposed along the length of said tubular sound retaining units to dampen standing waves.
References Cited (Backward Citations)
US3009104A
Cited
US3659255A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1978-02-03 | 1978-08-05 | 1979-02-04 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1982-02-03 | 1982-08-05 | 1983-02-04 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1986-02-03 | 1986-08-05 | 1987-02-04 | $7700.00 | Window Closed / Lapsed |