US3903497A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Opto-acoustic hydrophone
Assignee: United States Department of the Navy
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Filing: 1974-06-14
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Granted: 1975-09-02
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Expires: 1994-06-14
Abstract
Abstract An opto-acoustic hydrophone converting acoustic signals to corresponding modulated optical signals and transmitting the converted signals via a fiber optics cable to a remote location. The acoustic signal is first converted to an electrical signal prior to converting it to an optical type.
Inventors
- 👤 Morton Stimler
- 👤 Zaka I Slawsky
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 13:35
CPC Classifications
B; B06; B06B; B06B1/00; B06B1/02; B06B1/06; G; G01; G01V; G01V1/00; G01V1/22; H; H04; H04B; H04B10/00; H04B10/50; H04B10/501; H04B10/502
Claims Analysis
Total Claims: 3
Claim 1
Independent Claim
74 words
An opto-acoustic hydrophone-sonobuoy system comprising: a piezoelectric crystal in said hydrophone for converting received acoustic signals to electrical signals; a light emitting diode in said hydrophone for converting said electrical signals to optical signals; a matched amplifier coupled between said piezoelectric crystal and said light emitting diode; a fiber optics cable for transmitting said optical signal to said sonobuoy; and a demodulator in said sonobuoy for converting said optical signal to an electrical signal.
Claim 2
Dependent Claim
74 words
An opto-acoustic hydrophone-sonobuoy system comprising: a piezoelectric crystal in said hydrophone for converting received acoustic signals to electrical signals; a light emitting diode in said hydrophone for converting said electrical signals to optical signals; a matched amplifier coupled between said piezoelectric crystal and said light emitting diode; a fiber optics cable for transmitting said optical signal to said sonobuoy; and a demodulator in said sonobuoy for converting said optical signal to an electrical signal.
Claim 3
Dependent Claim
33 words
An opto-acoustic hydrophone-sonobuoy system as recited in claim 1 wherein the optical output of said diode (10) reproduces the received acoustic signal, said diode is a GaAs diode operating at 9,000 A wavelength.
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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) | 1978-09-01 | 1979-03-03 | 1979-09-02 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1982-09-01 | 1983-03-03 | 1983-09-02 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1986-09-01 | 1987-03-03 | 1987-09-02 | $7700.00 | Window Closed / Lapsed |