Ultra-sound sensor

Details Ultra-sound sensor Ultra-sound sensor

1987-10-30

1988-11-01

Jordan, Charles T.

Communications, electrical: acoustic wave systems and devices

Signal transducers

Underwater type

367163, 310800, 310349, H04R 1700

Patent

active

047824697

ABSTRACT:
The ultrasound sensor (2) of the invention comprises a polymer foil (4) which is supported in its outer region and is piezoelectrically activated at least in one portion (42). The portion (42) is coupled electrically to a first electrode (200) in the form of an adjacent, i.e., touching pin. A second electrode (8), in the form of a grid (214) connected to ground and/or a ring (216) connected to ground, is physically separated from the activated portion (42). The pin (200) is connected to the first input of an amplifier (210). The second input thereof is connected to ground. The metallic take-off at the activated zone (42) results in high sensitivity of the ultra-sound sensor (2) which is provided particularly for the measurement of shock waves with a high pressure amplitude and which finds application in lithotripsy.

REFERENCES:
patent: 3970862 (1976-07-01), Edelman et al.
patent: 4135108 (1979-01-01), Besson
patent: 4433400 (1984-02-01), DeReggi et al.
patent: 4517665 (1985-05-01), DeReggi et al.
patent: 4558249 (1985-12-01), Lerch et al.
patent: 4653036 (1987-03-01), Harris et al.
IEEE Transactions on Sonics and Ultrasonics, vol. SU-30, No. 5, Sep. 1983, pp. 295-303; G. R. Harris et al.: "An Analysis of Pulsed Ultrasonic Fields as Measured by PVDF Spot-Poled Membrane Hydrophones".

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