Communications – electrical: acoustic wave systems and devices – Signal transducers
Patent
1983-05-02
1988-10-18
Steinberger, Brian S.
Communications, electrical: acoustic wave systems and devices
Signal transducers
367176, 181151, H04R 1700
Patent
active
047792442
ABSTRACT:
An ultrasonic transducer assembly includes noise suppressing backing material for the transducer comprising a composite of a matrix material and particles of an attenuating soft material such as rubber, epoxy, and plastic. The particle size is preferably selected by sieving the particles through a sieve of grid size 30 to 80. In preferred embodiments the particles of attenuating soft material are filled with particles of heavy oxides, metal powders, or other density lowering fillers. The ratio of matrix material to filler particles determines mechanical strength and attenuation of the composite material. Attenuation coefficient and size of the filler particles determines the attenuation of the composite material.
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patent: 3515910 (1970-06-01), Fritz et al.
patent: 3794866 (1974-02-01), McElroy et al.
patent: 3894169 (1975-07-01), Miller
patent: 3922572 (1975-11-01), Cook et al.
patent: 4528652 (1985-07-01), Horner et al.
Beerman, Optimizing Matching Layers for a Three-Section Broad Band Transducer, IEEE, Vo. SV-20, No. 1, Jan. 1981.
Brisken Axel F.
Horner Michael S.
General Electric Company
Steinberger Brian S.
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