High-temperature microphone system

Details High-temperature microphone system High-temperature microphone system

1978-04-28

1979-04-17

Ruehl, Charles A.

Measuring and testing

Fluid pressure gauge

Diaphragm

73647, G01L 912, G01L 1100

Patent

active

041494237

ABSTRACT:
Apparatus for measuring pressure fluctuations in air or other gases in an area of elevated temperature. A condenser microphone is located in the area of elevated temperature and electronics for processing changes in the microphone capacitance is located outside the area and connected to the microphone by means of a high-temperature cable assembly. The microphone includes apparatus for decreasing the undesirable change in microphone sensitivity at high temperatures. The high-temperature cable assembly operates as a half-wavelength transmission line in an AM carrier system and maintains a large temperature gradient between the two ends of the cable assembly. The processing electronics utilizes a voltage controlled oscillator for automatic tuning thereby increasing the sensitivity of the measuring apparatus.

REFERENCES:
patent: 3868856 (1975-03-01), Fletcher
patent: 3948102 (1976-04-01), Coon
patent: 3964319 (1976-06-01), Fletcher

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