Gas filter correlation spectroscopy
From AMS Glossary
gas filter correlation spectroscopy
A form of nondispersive infrared spectrometry that takes advantage of the banded nature of gas-phase infrared spectra.
The background level of radiation is measured by inserting a concentrated sample of the gas to be analyzed, thus filtering out wavelengths specific to that molecule. The technique has found application for the remote sensing of atmospheric species from satellites, for example, HNO3 (Gille and Russell 1984). It has also been used in ground-based applications such as the measurement of emissions from automobiles (Bishop et al. 1989).
Gille, J. C., and J. M. Russell III 1984. The Limb Infrared Monitor of the Stratosphere: Experimental description, performance, and results. J. Geophys. Res.. 89. 5125–5140.
Bishop, G. A., J. R. Starkey, A. Ihlenfeldt, W. J. Williams, and D. H. Stedman 1989. IR long-path photometry: A remote sensing tool for automobile emissions. Analytical Chemistry . 61. 671A– 677A.