Infrared emission detection

Details Infrared emission detection Infrared emission detection

G - Physics

01

N

354/138, 73/51

G01N 21/72 (2006.01) G01N 21/71 (2006.01) G01N 21/35 (2006.01) G01N 30/74 (2006.01)

Patent

CA 1332204

-72- ABSTRACT The means and method for observing infrared emission from excited molecules in samples of interest was investigated. Over the wavelength interval from 1 to 5 µm, two strong emission bands were observed with a PbSe detector when organic compounds were introduced into an hydrogen/air flame. The band at 4.3 µm (2326 cm-1) was due to the asymmetric stretch of carbon dioxide while the band at 2.7 µm was due to both water and carbon dioxide emission. The carbon dioxide emission at 4.3 µm was found to be most intense at the tip of the flame, and was found to increase with the amount of organic compound introduced into the flame. For chromatographic application, an optical filter was used to isolate the 4.3 µm emission band.

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