Directional sonar transducer
Abstract
Abstract A TRANSDUCER FOR UNDERWATER ACOUSTIC SENSING SYSTEMS WHEREIN THE TRANSDUCER COMPRISES HOLLOW PIEZOELECTRIC CERAMIC CYLINDERS ACOUSTICALLY ISOLATED AND STACKED IN A VERTICAL INTERSTITIAL ARRAY. THREE TRANSDUCER SECTIONS ARE UTILIZED HAVING AN OUTPUT LEVEL AND RELATIVE POLARITY RELATED IN ACCORDANCE WITH THE DIRECTION FROM WHICH THE ACOUSTIC SIGNAL BEING RECEIVED ARRIVES. ONE OF THE ACOUSTIC RECEIVING PATTERNS IS OMNIDIRECTIONAL, AND THE OTHERS ARE SINECOSINE DIPOLE PATTERNS WHICH HAVE THE CHARACTERISTICS OF OUTPUT LEVEL VARIATION WITH BEARING. THE OMNI OUTPUT PROVIDES AN AMPLITUDE AND PHASE REFERENCE FOR COMPARING THE AMPLITUDE AND POLARITIES OF THE TWO BEARING-SENSITIVE SIGNALS. THE RESULTANT THREE SIGNALS, AND COMPASS INFORMATION CONSTITUTE THE PRIMARY OUTPUTS OF THE SENSING SYSTEM WHICH ARE TRANSMITTED TO SUITABLE DECODING AND RADIO TRANSMISSION APPARATUS.
Inventors
- 👤 Ernest A Granfors
- 👤 Don L Loveless
- 👤 Charles F Boyle
- 👤 Harry W Kompanek
Bibliographic Details
Claims Analysis
Total Claims: 0References Cited (Backward Citations)
No citation records indexed.
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1974-02-15 | 1974-08-17 | 1975-02-16 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1978-02-15 | 1978-08-17 | 1979-02-16 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1982-02-15 | 1982-08-17 | 1983-02-16 | $7700.00 | Window Closed / Lapsed |