Far infrared multiple-path cell without internal mirrors

Details Far infrared multiple-path cell without internal mirrors Far infrared multiple-path cell without internal mirrors

Nov 1990

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1990spie.1341..268m&link_type=abstract

IN: Infrared technology XVI; Proceedings of the Meeting, San Diego, CA, July 11-13, 1990 (A92-21426 07-35). Bellingham, WA, Soci

Physics

Absorption Spectra, Far Infrared Radiation, Infrared Absorption, Methane, Molecular Spectra, Ray Tracing, Reflectance

Scientific paper

A mirrorless multiple path cell which can be efficiently used in the FIR is described. The device is based on the White cell and light pipe methods, and requires no setup even after cooling. It is shown how the system can be efficiently operated if certain geometrical conditions are maintained which ensure a uniform light energy distribution inside the cell. The optimization of some physical parameters is discussed, and it is shown that an effective absorption pathlength as long as 4 or 5 m can be obtained with a simple absorption cell which is 10 cm long. The FIR spectrum of CH4 obtained using the cell is presented.

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