A field-portable thermal infrared grating spectrometer (THIRSPEC)

Author

Rivard, Benoit ; Thomas, Paul J. ; Pollex, D. ; Hollinger, A. ; Miller, John R. ; Dick, R.

Author_Institution

Inst. for Space & Terrestrial Sci., York Univ., North York, Ont., Canada

Volume

32

Issue

2

fYear

1994

fDate

3/1/1994 12:00:00 AM

Firstpage

307

Lastpage

314

Abstract

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 μm with a Nyquist limited resolution of 0.16 μm. The instrument averages over a 12° 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°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

Keywords

geophysical equipment; infrared detectors; infrared imaging; infrared spectroscopy; portable instruments; remote sensing; spectrometers; 7.9 to 11.3 mum; HgCdTe; IR spectra; Nyquist limited resolution; THIRSPEC; detector array; far infrared spectroscopy; field studies; geology IR spectrometer; geophysical equipment; measurement technique; portable instrument; remote sensing ground truth; rock; thermal infrared grating spectrometer; Detectors; Geoscience; Gratings; Infrared spectra; Instruments; Reflection; Sensor arrays; Spectroscopy; Surface impedance; Temperature distribution;

fLanguage

English

Journal_Title

Geoscience and Remote Sensing, IEEE Transactions on

Publisher

ieee

ISSN

0196-2892

Type

jour

DOI

10.1109/36.295046

Filename

295046