Ultrasonic transducer for the determination of the acoustic powe

Details Ultrasonic transducer for the determination of the acoustic powe Ultrasonic transducer for the determination of the acoustic powe

1986-12-12

1988-08-16

Kyle, Deborah L.

Communications, electrical: acoustic wave systems and devices

Signal transducers

367150, 367165, 310800, 310335, 73642, H04B 1700

Patent

active

047649054

ABSTRACT:
The invention concerns an ultrasonic transducer for the determination of the acoustic power of an ultrasonic field (1) focused at a point (F). According to the invention, an ultrasonic transducer 2 contains a support structure (4) which has the shape of a spherical cup and whose center coincides with the focus (F) of the focused ultrasonic field (1), and a piezoelectric polymer foil (6) equipped on its respective surfaces (62, 64) with a conductive layer (8) is attached to said support structure. These measures ensure that the acoustic charge vibrations within the area formed by the piezoelectric polymer foil (6) are at least approximately in phase and that the respective surface charge vibrations can be measured with the aid of a single, continuous electrode without partial mutual cancellation.

REFERENCES:
patent: 2565159 (1951-08-01), William
patent: 3903990 (1975-09-01), Tannaka
patent: 4197921 (1980-04-01), Alphonse et al.
patent: 4535630 (1985-08-01), Samodovitz
patent: 4549107 (1985-10-01), Kaneko et al.
patent: 4556814 (1985-12-01), Ito et al.
patent: 4577132 (1986-03-01), Ohigashi et al.
patent: 4725989 (1988-02-01), Granz et al.
Acustica, Band 58, Sep. 1985, Seiten 215-222, Stuttgart, DE; Muller et al.; "Einsatz einer breitbandigen Piezodrucksonde auf PVDF-Basis zur Untersuchung konvegierender Stosswellen in Wasser".
Ultransonics, May 1980, Seiten 123-126, Guildford, GB; Shotton: "A PVDF Membrane Hydrophone for Operation in the Range 0.5MHz to 15MHz".
Ultrasonics, Sep. 1981, Seiten 213-216, Guildford, GB; Lewin: "Miniature Piezoelectric Polymer Ultrasonic Hydrophone Probes".

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