Resonant spectrophone system noise elimination

Details Resonant spectrophone system noise elimination Resonant spectrophone system noise elimination

1981-08-27

1983-11-01

Ciarlante, Anthony V.

Measuring and testing

Gas analysis

By vibration

73579, G01N 2902

Patent

active

044124457

ABSTRACT:
A resonant spectrophone system has a laser arranged to direct a laser beam into a chamber containing gas to be analyzed wherein absorption data relative to the gas constituents is obtained by detecting pressure variations within the chamber. The laser is operated such that the laser beam passing through the chamber generates a resonant wave therein. Pressure variations within the chamber are monitored at locations corresponding to nodal and/or peak points of the resonant wave. The nodal point signals represent background noise and are subtracted from the peak point signals to remove noise components from the peak point signals or out-of-phase nodal signals are subtracted to perform this function and thereby yield signals which more accurately represent the absorption data relative to the gas constituents.

REFERENCES:
patent: 4163382 (1979-08-01), Amer
patent: 4280823 (1981-07-01), Sozonntagh

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