The responsivity and self-emission of a double-beam FTIR interferometer are modeled in view to simplify the procedure of radiometric calibration. Measurements have shown that the two responsivities associated with each interferometer channel are different in certain spectral regions. It has been attributed to a dissymmetry between the optical transmissions of the two plates forming the beamsplitter. This dissymmetry is also responsible for the instrument self-emission. A model that gives the instrument self- emission in terms of the beamsplitter temperature is presented and tested. An automatic calibration procedure derived from the modeling study is discussed.

Date Published: 26 February 1999
PDF: 9 pages
Proc. SPIE 3537, Electro-Optic, Integrated Optic, and Electronic Technologies for Online Chemical Process Monitoring, (26 February 1999); doi: 10.1117/12.341030

Published in SPIE Proceedings Vol. 3537:
Electro-Optic, Integrated Optic, and Electronic Technologies for Online Chemical Process Monitoring
Mahmoud Fallahi; Mahmoud Fallahi; Robert J. Nordstrom; Terry R. Todd, Editor(s)