Open-path atmospheric monitoring with a low-resolution FTIR spectrometer

Peter R. Griffiths; Robert L. Richardson; Deru Qin; Changjiang Zhu

doi:10.1117/12.210802

31 May 1995 Open-path atmospheric monitoring with a low-resolution FTIR spectrometer

Peter R. Griffiths, Robert L. Richardson, Deru Qin, Changjiang Zhu

Proceedings Volume 2365, Optical Sensing for Environmental and Process Monitoring; (1995) https://doi.org/10.1117/12.210802
Event: Optical Sensing for Environmental and Process Monitoring, 1994, McLean, VA, United States

Abstract

The advantages of measuring open-path Fourier transform infrared (OP/FT-IR) spectra at low resolution are discussed both from a theoretical and experimental viewpoint. In general, the optimum combination of selectivity and sensitivity is found when the resolution is approximately equal to the average full-width at half height (FWHH) of the analytical bands. The FWHH of many bands in the vapor-phase spectra of molecules of medium size, such as chlorinated organic solvents, is approximately 20 cm^MIN1, so that a resolution of 16 cm^MIN1 is often found to yield the most accurate analytical results. The low baseline noise level found when spectra are measured at low resolution can allow room temperature deuterated triglycine sulfate pyroelectric bolometers to be used instead of liquid nitrogen cooled mercury cadmium telluride photodetectors for OP/FT-IR measurements.

Citation Download Citation

Peter R. Griffiths, Robert L. Richardson, Deru Qin, and Changjiang Zhu "Open-path atmospheric monitoring with a low-resolution FTIR spectrometer", Proc. SPIE 2365, Optical Sensing for Environmental and Process Monitoring, (31 May 1995); https://doi.org/10.1117/12.210802

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