High precision detection of infrared energy spectrum

Abstract

Infrared energy spectrum has unique absorption properties for different gas. The complexity of the gas molecules determines the number of absorption peaks. The amount of absorption and the specific character of the absorption curve are unique to each gas. That the infrared absorption is different between carbon isotope's oxides can be used for medical treatment, provided detection precision is high enough. In order to implement high precision, refer measurement cell is introduced in this paper, which is in swing way periodically switched with the main measurement sample cell to come true channel consistency, and the modulation frequency is selected by the maximum detection rate of the detector. © 2011 Springer-Verlag.