Acoustic damper

Details Acoustic damper Acoustic damper

1987-10-30

1989-04-18

Fuller, B. R.

Acoustics

Sound-modifying means

181148, 181198, 367152, 367171, 367176, 367188, 381 91, 381158, H04R 700

Patent

active

048218383

ABSTRACT:
An acoustic damper for substantially reducing the reverberation echoes at the junction between an acoustic signal propagating fluid and a material having an acoustic impedance substantially different from that of the fluid. The damper, which is particularly adapted for use in ultrasonic transducers, is formed of a material having an acoustic impedance which substantially matches the acoustic impedance of the fluid, such material preferably being a foam plastic material having sufficient hardness to be acoustically stable. For preferred embodiments, the damper is formed of a laminate of the layer described above and a second layer of a material which provides high acoustic attenuation, such as cork material.

REFERENCES:
patent: 2434666 (1948-01-01), Mason
patent: 2497680 (1950-02-01), Massa
patent: 3108247 (1963-10-01), Harris
patent: 4450544 (1984-05-01), Dencro et al.

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