A field-portable thermal infrared grating spectrometer (THIRSPEC)

A thermal infrared grating spectrometer was developed for field studies in the Earth sciences. The design is based on a reflection grating and a 60-element HgCdTe detector array. The useful spectral range of the instrument covers 7.9-11.3 /spl mu/m with a Nyquist limited resolution of 0.16 /spl mu/m...

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Bibliographic Details
Published in:IEEE transactions on geoscience and remote sensing 1994-03, Vol.32 (2), p.307-314
Main Authors: Rivard, B., Thomas, P.J., Pollex, D., Hollinger, A., Miller, J.R., Dick, R.
Format: Article
Language:English
Subjects:
Areal geology. Maps
Detectors
Earth sciences
Earth, ocean, space
Exact sciences and technology
External geophysics
Geologic maps, cartography
Geophysics. Techniques, methods, instrumentation and models
Geoscience
Gratings
Infrared spectra
Instruments
Reflection
Sensor arrays
Spectroscopy
Surface impedance
Temperature distribution
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Summary:A thermal infrared grating spectrometer was developed for field studies in the Earth sciences. The design is based on a reflection grating and a 60-element HgCdTe detector array. The useful spectral range of the instrument covers 7.9-11.3 /spl mu/m with a Nyquist limited resolution of 0.16 /spl mu/m. The instrument averages over a 12/spl deg/ field of view and compares the exitance of the target to that of an internal black body at ambient temperature. The noise equivalent temperature is approximately 0.06/spl deg/K over the useful spectral range. Background radiance reflected from the surface of the target can seriously impede the determination of emissivity. This effect is removed from the spectra of geological samples by the use of reference samples.< >
ISSN:0196-2892
1558-0644
DOI:10.1109/36.295046