IR FOURIER SPECTROMETER FOR DIFFERENTIAL DETECTION: DESIGN, PROTOTYPE AND RESULTS

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Authors
  1. Theriault, J-M.
Corporate Authors
Defence Research Establishment Valcartier, Valcartier QUE (CAN)
Abstract
The report presents the theoretical basis and validation measurements supporting a new configuration of Fourier-transform IR spectrometer optimized for differential detection. The optimized configuration exploits the optical subtraction capabilities of a double-beam Michelson interferometer. It has been designed to satisfy two requirements, the suppression of the internal IR emission contributions arising from the spectrometer itself. The resulting configuration is a fully symmetrical FTIR double-beam interferometer with a special beamsplitter assembly. To verify the proposed design a prototype has been developed and tested experimentally. The results obtained with this prototype indicate a high level of suppression with a residual usually smaller than 2% in the spectral range from 3.5 to 15 mu m. The analysis of the results indicates that the remaining residual can be explained by small dissymetries in transmittance and thickness of the two ZnSe substrates forming the beamsplitter. Finally, this spectrometer configuration allows a permanent radiometric calibration, which represents a definitive advantage over conventional FTIR insturments.
Keywords
Fourier transform infrared interferometer (FTIR);Passive remore sensing;Differential detection;Double beam interferometer
Report Number
DREV-9804 — Technical Report
Date of publication
01 Jun 1998
Number of Pages
65
DSTKIM No
98-01499
CANDIS No
508328
Format(s):
Hardcopy;Document Image stored on Optical Disk

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