Parametric dual mode transducer

Details Parametric dual mode transducer Parametric dual mode transducer

1980-10-03

1983-02-08

Miller, J. D.

Electrical generator or motor structure

Non-dynamoelectric

Piezoelectric elements and devices

367155, 367158, 310337, H04B 1300

Patent

active

043731430

ABSTRACT:
A dual mode transducer has the capability of high power active transmission t two separate frequencies more than two octaves apart with broad bandwidth at both frequencies. The low frequency transducer is a standard double mass loaded longitudinal vibrator which has a head mass composed of a small array of high frequency transducers. The high frequency transducers are either half-wave resonators or tonpilz types. These high frequency transducers have a nodal plate mounting. The head mass of the low frequency transducer has a plurality of apertures which accept the high frequency transducers. The rear of each high frequency transducer is recessed into an aperture and has air as an acoustic pressure release. Both low and high frequency transducers form part of an electrically steerable array.

REFERENCES:
patent: 2746026 (1956-05-01), Camp
patent: 3284761 (1966-11-01), Douglas
patent: 3329408 (1967-07-01), Branson
patent: 3952216 (1976-04-01), Madison et al.

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