Two-cell spectrophone detects trace amounts of atmospheric pollutants by measuring absorption coefficients of gases with various laser sources. Device measures pressure difference between two tapered cells with differential manometer. Background signal is reduced by balanced window heating and balanced carrier gas absorption in two cells.
Differential-optoacoustic absorption detector
NASA Tech Briefs ; 1 , 4
1977-03-01
Miscellaneous
No indication
English
A balloon-borne differential absorption spectrometer with temperature-stabilized detector
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