The design and performance of a remote Raman spectrometer are described. The unit has been tested at ranges from several hundred yards to a half-mile in full daylight under both clear atmosphere and fog conditions. Good S/N ratios were obtained for the detection of atmospheric H2O and CO2 as well as SO2 (300 ppm m) and hydrocarbon vapors (17 ppm m) in controlled sources, with a range resolution of 10 m. This is more than two orders of magnitude better than the best published results to date.
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Hirschfeld et al. (1973) studied this question.
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