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Applied Optics

Applied Optics

APPLICATIONS-CENTERED RESEARCH IN OPTICS

  • Vol. 38, Iss. 3 — Jan. 20, 1999
  • pp: 505–515

Modeling the Responsivity and Self-Emission of a Double-Beam Fourier-Transform Infrared Interferometer

Jean-Marc Thériault  »View Author Affiliations


Applied Optics, Vol. 38, Issue 3, pp. 505-515 (1999)
http://dx.doi.org/10.1364/AO.38.000505


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Abstract

A modeling study aimed at characterizing the radiometric properties of a double-beam Fourier-transform infrared interferometer is presented. Measurements showed that the two responsivities associated with each interferometer channel are different in certain spectral regions. This anomaly was attributed to a dissymmetry between the optical transmissions of the two plates that form the beam splitter. This dissymmetry is primarily responsible for the instrument residual emission. A secondary cause of residual emission is attributed to the relative alignment of the two input optics. Both effects were taken into account in a model that gives the instrument residual emission in terms of the beam splitter temperature. Actual results indicate that in the 7–14-μm window the instrument residual emission can be modeled with an absolute radiometric error smaller than 0.5 K (blackbody at 290 K). The model was used to develop an automatic calibration procedure that yields radiance errors smaller than 0.05 μW/cm2 sr cm−1 in the 7–14-μm band. The radiometric stability of the interferometer was analyzed.

© 1999 Optical Society of America

OCIS Codes
(010.0010) Atmospheric and oceanic optics : Atmospheric and oceanic optics
(010.1290) Atmospheric and oceanic optics : Atmospheric optics
(220.2740) Optical design and fabrication : Geometric optical design
(230.1360) Optical devices : Beam splitters
(260.3160) Physical optics : Interference
(280.1120) Remote sensing and sensors : Air pollution monitoring
(300.6300) Spectroscopy : Spectroscopy, Fourier transforms

Citation
Jean-Marc Thériault, "Modeling the Responsivity and Self-Emission of a Double-Beam Fourier-Transform Infrared Interferometer," Appl. Opt. 38, 505-515 (1999)
http://www.opticsinfobase.org/ao/abstract.cfm?URI=ao-38-3-505


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