Publication Date:
2019-07-12
Description:
Electro-optic phase-modulation gas-correlation spectroscopy demonstrated in laboratory tests promising candidate technique for remote sensing of gases, temperatures, and wind velocities in atmosphere. In technique radiation emitted by sample atmosphere passed through electro-optic phase modulator, and modulated and unmodulated versions of spectrum alternately passed through reference absorption cell containing gas to be detected. Radiation emerging from reference cell band-pass filtered and detected. Correlation signal is difference in intensity between phase-modulated and unmodulated detected signals.
Keywords:
PHYSICAL SCIENCES
Type:
NPO-17013
,
NASA Tech Briefs (ISSN 0145-319X); 13; 3; P. 52
Format:
text
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