US4497046A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Long line hydrophone
Assignee: United States Department of the Navy
•
Filing: 1981-06-24
•
Granted: 1985-01-29
•
Expires: 2001-06-24
Abstract
Abstract A long line hydrophone wound with a pair of bifilar ribbons that are connected to a constant current high frequency source.
Inventors
- 👤 Howard T. Savage
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-10 01:27
CPC Classifications
G; G01; G01V; G01V1/00; G01V1/16; G01V1/20; G01V1/201; G01V1/208; G01H; G01H11/00; G01H11/02; G01H11/04
Claims Analysis
Total Claims: 7
Claim 1
Independent Claim
116 words
A long line hydrophone comprising a long hollow compliant tube, the tube being tightly wound with multiple bifilar ribbons, with combined means to supply constant current to each bifilar ribbon at high frequency, each bifilar ribbon consisting of a magnetorestrictive material and where the compliant tube is filled with a suitable liquid and where the liquid moves to change the shape of the tube and to change the length and magnetoresistive properties of the bifilar ribbons in response to stress on the tube that produces a change in voltage and where the bifilar ribbons are connected to a low voltage DC bias, a constant current, high frequency source and means to measure the change in voltage.
Claim 2
Dependent Claim
116 words
A long line hydrophone comprising a long hollow compliant tube, the tube being tightly wound with multiple bifilar ribbons, with combined means to supply constant current to each bifilar ribbon at high frequency, each bifilar ribbon consisting of a magnetorestrictive material and where the compliant tube is filled with a suitable liquid and where the liquid moves to change the shape of the tube and to change the length and magnetoresistive properties of the bifilar ribbons in response to stress on the tube that produces a change in voltage and where the bifilar ribbons are connected to a low voltage DC bias, a constant current, high frequency source and means to measure the change in voltage.
Claim 3
Dependent Claim
14 words
The hydrophone of claim 1 wherein the tube is filled with a suitable liquid.
Claim 4
Dependent Claim
22 words
The hydrophone of claim 2 wherein the ribbons consist of an amorphous iron alloy, with a modulus that changes substantially with field.
Claim 5
Dependent Claim
17 words
The hydrophone of claim 3 wherein the ribbons are from 0.0008 inches thick to 0.002 inches thick.
Claim 6
Dependent Claim
19 words
The hydrophone of claim 1 wherein the original crossection is circular and remains circular as a function of stress.
Claim 7
Dependent Claim
20 words
The hydrophone of claim 1 wherein the original crossection is elliptcal and becomes more ellipticall as a function of stress.
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) | 1988-01-29 | 1988-07-30 | 1989-01-29 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1992-01-29 | 1992-07-30 | 1993-01-29 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1996-01-29 | 1996-07-30 | 1997-01-29 | $7700.00 | Window Closed / Lapsed |