Capacitive transducer system and method

Details Capacitive transducer system and method Capacitive transducer system and method

1990-11-30

1992-11-03

Steinberger, Brian S.

Communications, electrical: acoustic wave systems and devices

Signal transducers

Receivers

310309, 361271, 381191, H04R 1900

Patent

active

051611287

ABSTRACT:
A capacitive transducer including a back plate and a tensioned dielectric diaphragm with a conductive layer is operated as a sonic energy emitter and receiver. The polarity of the dc bias applied to the transducer is periodically reversed to prevent charging and polarization of the dielectric diaphragm due to the applied electrostatic field. The bias voltage polarity is controlled in timed sequence with the application of a fluctuating voltage to generate sonic energy with optimum efficiency. Electrical signals resulting from received sonic energy are selectively inverted and provided with compensation for differences resulting from differences in bias polarities.

REFERENCES:
patent: 3041418 (1962-01-01), Lazzery
patent: 3373251 (1968-03-01), Seeler
patent: 3786495 (1974-01-01), Spence
patent: 4695986 (1987-09-01), Hossack
patent: 4769793 (1988-09-01), Kniest et al.
patent: 4823590 (1989-04-01), Kniest et al.
patent: 4887246 (1989-12-01), Hossack et al.
Kuhl et al., "Condenser Transmitters and Microphones . . . ", ACUSTICA, vol. 4, No. 5 (1954) National Semiconductor LM-1830 Fluid Detector.

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