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Applied Optics

Applied Optics


  • Vol. 35, Iss. 31 — Nov. 1, 1996
  • pp: 6203–6209

Effects of the self-emission of an IR Fourier-transform spectrometer on measured absorption spectra

J. Schreiber, T. Blumenstock, and H. Fischer  »View Author Affiliations

Applied Optics, Vol. 35, Issue 31, pp. 6203-6209 (1996)

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Up to now the effect of the modulated thermal self-emission of Fourier-transform spectrometers has been investigated for emission measurements only. But this instrumental radiation also influences Fourier-transform absorption spectroscopy in the mid-IR when the Moon, a hot blackbody, or even the Sun is taken as a radiation source, e.g., by causing small negative radiance values in the center of saturated absorption lines. For our experimental investigations, a blackbody that can be cooled down to liquid-nitrogen temperature was constructed. Measurements at different temperatures of the blackbody and for different optical configurations in the detector port of the Fourier spectrometer as well as transmission measurements of gas cells are used to examine the statements above.

© 1996 Optical Society of America

Original Manuscript: October 23, 1995
Revised Manuscript: April 18, 1996
Published: November 1, 1996

J. Schreiber, T. Blumenstock, and H. Fischer, "Effects of the self-emission of an IR Fourier-transform spectrometer on measured absorption spectra," Appl. Opt. 35, 6203-6209 (1996)

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