Directional waterproof ultrasonic transducer for operating in ai

Details Directional waterproof ultrasonic transducer for operating in ai Directional waterproof ultrasonic transducer for operating in ai

1988-04-07

1989-08-22

Budd, Mark O.

Electrical generator or motor structure

Non-dynamoelectric

Piezoelectric elements and devices

310326, 310340, 310369, H01L 4108

Patent

active

048598976

ABSTRACT:
An improved ultrasonic transducer designed for rugged outdoor applications uses a thin-walled cylindrical tube of polarized ceramic operating in the fundamental circumferential resonant frequency mode. The major portion of the external surface area of the vibrating cylinder is covered by a sound insulating barrier, thereby preventing sound radiation from the covered non-radiating surface area portion of the cylinder. Specific unique relationships between the diameter, length and wall thickness of the ceramic tube, which are necessary to achieve the objects of the invention, are described.

REFERENCES:
patent: 2447333 (1948-08-01), Hayes
patent: 2480535 (1949-08-01), Alois et al.
patent: 2775434 (1956-12-01), Probst
patent: 2922140 (1960-01-01), Levine et al.
patent: 3748637 (1973-07-01), Larson et al.
patent: 3847667 (1974-11-01), Massa
patent: 4528853 (1985-07-01), Lerch et al.
patent: 4630245 (1986-12-01), Dam

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