Portable ultrasonic underwater sensor

Details Portable ultrasonic underwater sensor Portable ultrasonic underwater sensor

1996-01-17

1997-06-03

Lobo, Ian J.

Communications, electrical: acoustic wave systems and devices

Signal transducers

Underwater type

367141, 310337, H04R 1700

Patent

active

056361823

ABSTRACT:
A portable ultrasonic underwater sensor 15 has a piezoelectric element 21 disposed in a case 22 constructed as a cylinder 24 and having a truncated cone 25 both being integrally and axisymmetrically formed so as to constitute a vibrator 22A. A piezoelectric element 21 and the vibrator 22A are bonded together with a center of the piezoelectric element 21 matches the center of a reverse face of the truncated cone 25 of vibrator 22A, whereby the vibrator 22A is entirely resonant in a vibration mode in which flexional vibration at the center of the truncated cone 25 is a maximum amplitude, and wherein means for holding the vibrator 22A is located along a vibration nodal line on an external side face of the vibrator 22A.

REFERENCES:
patent: 3736632 (1973-06-01), Barrow
patent: 3943388 (1976-03-01), Massa
patent: 4220040 (1980-09-01), Noguchi et al.
patent: 4755975 (1988-07-01), Ito et al.
patent: 4823042 (1989-04-01), Coffey et al.
Japanese Unexamined Patent Publication (JP-A) No. Hei 3(1991)-68226 (Taiheiyo Asutei K.K.) Dated: 1991.
Japanese Examined Patent Publication No. Sho 61(1986)-13172 (Untranslated name in Japanese language) Dated: 1986.

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