Towable VLF sonar projector

Details Towable VLF sonar projector Towable VLF sonar projector

1975-04-23

1976-11-02

Lechert, Jr., Stephen J.

Communications: electrical

Selective

Having indication or alarm

181113, 340 8R, G01V 100

Patent

active

039900347

ABSTRACT:
A transverse variable reluctance transducer of acoustic energy is configu to lend itself to being towed through the water while it radiates acoustic energy. Its elongate, cylindrical shape, which has an axial tunnel running its length, allows the flow of cooling water to prevent excessive heat from building up. The transducer's linear vibrator motor has its outer shell windings DC excited while the inner core or reciprocator has its windings AC excited. As the AC source is changed from one frequency range to another, responsive changes in the projected acoustic signal are radiated from suitably interconnected projection surfaces. In one configuration, one of the projection surfaces is in communication with the fluid flowing through the axial tunnel at one end of the transducer and another projection surface faces radially outwardly from the transducer's opposite end. Another configuration has both of these projection surfaces facing radially outwardly at opposite ends of the transducer. In both of these configurations the projection surfaces do not interfere with the towing or the cooling of the transducer. Both of these transducers have projection surfaces which are uniquely coupled to the vibration motor so as to magnify the amplitude of their radial displacement with respect to the axial excursions of the motor. Another variation of this inventive concept employs the same motor with the reciprocator coupled to one side of a series of axially aligned discs while the stator is coupled to the other side.

REFERENCES:
patent: 3346841 (1967-10-01), Weichart
patent: 3932835 (1976-01-01), Abbott

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