Acoustical modulator not necessary. Two-frequency electro-optic gas-correlation spectrometer relatively simple. Illumination provided by ordinary lamp, no moving parts, and filtered output of detector is beat-frequency signal directly proportional to correlation between spectra of gases in cells.
Two-Frequency Electro-Optic Gas-Correlation Spectrometer
NASA Tech Briefs ; 13 , 12
1989-12-01
Sonstige
Keine Angabe
Englisch
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