Laboratory experiments for absolute temperature sounding of cold cometary surfaces using an IR Fourier transform spectrometer

Details Laboratory experiments for absolute temperature sounding of cold cometary surfaces using an IR Fourier transform spectrometer Laboratory experiments for absolute temperature sounding of cold cometary surfaces using an IR Fourier transform spectrometer

Apr 1992

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1992angeo..10..235o&link_type=abstract

(Modelling, simulation and sounding of cometary nuclei; Proceedings of the International Workshop, Cagliari, Italy, May 28-30, 1

Computer Science

Sound

1

Comet Nuclei, Emission Spectra, Fourier Transformation, Infrared Spectrometers, Surface Temperature, Temperature Measurement, Extraterrestrial Matter, Space Environment Simulation, Spectral Emission

Scientific paper

Consideration is given to a novel method for extracting absolute temperature information from the emission spectra of cold (193-227 K) cometary analog materials. To test the method, emission spectra of three samples in the spectral range 710-2000/cm with a spectral resolution of 15.4/cm were taken. The new method involves fitting a model curve based on Planck's law to the emission spectra measured and solving not only for the temperature of the object but also for the ambient temperature and the spectral emittances of the object in M different spectral channels. The uncertainty of the calculated temperatures is of the order of +/- 5 K, taking into account the error of calibration temperatures (+/- 0.5 K) and the drift of the spectrometer during measurement (+/- 1.5 percent over 15 min). It is shown that radiometric calibration of the Fourier transform spectrometer has to be performed using magnitude and phase spectra by applying complex mathematics.

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