Ultrasonic microphone for operating with an accumulated layer of

Details Ultrasonic microphone for operating with an accumulated layer of Ultrasonic microphone for operating with an accumulated layer of

1976-04-26

1977-07-05

Stellar, George G.

Measuring and testing

Moisture content or absorption characteristic of material

H04R 700

Patent

active

040331806

ABSTRACT:
A microphone is described for operating in dirty environments where a layer of dirt or mud may accumulate over the vibratile surface of microphone. The microphone is designed with its vibratile diaphragm having a mass greater than 0.4 gm/sq cm of diaphragm area so that an added layer of dirt over its surface will not cause any significant change in the sensitivity of the microphone over its prescribed frequency range of operation.

REFERENCES:
patent: 2978669 (1961-04-01), Harris
patent: 3584243 (1971-06-01), Fabian

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