Communications – electrical: acoustic wave systems and devices – Signal transducers – Underwater type
Patent
1985-11-12
1987-11-24
Jordan, Charles T.
Communications, electrical: acoustic wave systems and devices
Signal transducers
Underwater type
367164, 310316, 310317, H04R 1700
Patent
active
047093609
ABSTRACT:
An acoustic transducer, especially adapted for hydrophones, is disclosed. The transducer comprises a piezoelectric ceramic disk with a main or signal electrode, a common electrode and a feedback electrode; negative feedback is provided around an associated amplifier and the transducer. The transducer is useful in either a sonic receiver or a sonic transmitter. Various ceramic disk configurations are disclosed and several electrode configurations are disclosed. The negative feedback minimizes the undesired effects of the high Q characteristic of the piezoelectric ceramic transducer. The transducer exhibits improved frequency response characteristics including increased bandwidth and reduced resonance effects, fixed or linear phase shift over a broad range and improved transient response. Also, the effect of normal manufacturing variations upon sensitivity, frequency and phase response is minimized.
REFERENCES:
patent: 3562764 (1971-02-01), Fujishima
patent: 4197478 (1980-04-01), Silvus
patent: 4277758 (1981-07-01), Mishiro
patent: 4336510 (1982-06-01), Miyamori
patent: 4363993 (1982-12-01), Nishigaki et al.
Martin Robert J.
Sims Claude
Eldred John W.
Jordan Charles T.
Sparton Corporation
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