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Proceedings Paper

Airborne and laboratory remote sensing applications of the CSIRO CO2 laser spectrometer MIRACO2LAS
Author(s): L. B. Whitbourn; T. J. Cudahy; Jonathan F. Huntington; P. M. Connor; P. Mason; R. N. Phillips; Peter Hausknecht
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Paper Abstract

The mid-infrared airborne CO2 laser spectrometer (MIRACO2LAS) was developed by CSIRO Division of Exploration and Mining to investigate the potential role of high spectral resolution thermal infrared (TIR) remote sensing for improved remote sensing of minerals, especially those silicate minerals that do not have diagnostic features at shorter wavelengths, such as quartz, feldspars, pyroxenes and garnets. Other objectives include testing and validating methods used to separate the mineralogically significant emissivity from temperature effects in passive TIR systems, as MIRACO2LAS reflectance data are unaffected by surface temperature effects. MIRACO2LAS uses a CO2 laser, which scans through 100 wavelengths between 9.1 and 11.2 micrometers, as a light source for 'active' remote sensing. The laser system is sufficiently rapidly tuned to allow the airborne system to operate in a line profile mode, producing contiguous ground reflectance spectra for a footprint (or pixel) diameter of 2 meters. Typical airborne data are presented, demonstrating successful identification of a number of minerals. A laboratory carbon-dioxide laser spectrometer system has also been developed to validate the MIRACO2LAS spectral signatures and to construct reference spectral libraries of pure minerals and other materials. Besides the compositional influence on the reflectance spectra, physical parameters, such as grain size and grain shape, are shown to affect the reflectance spectra. Plant materials, many of which depart significantly from blackbody behavior for different leaf orientations and arrangements, are also investigated.

Paper Details

Date Published: 2 July 1997
PDF: 10 pages
Proc. SPIE 3059, Advances in Laser Remote Sensing for Terrestrial and Oceanographic Applications, (2 July 1997); doi: 10.1117/12.277604
Show Author Affiliations
L. B. Whitbourn, CSIRO Div. of Exploration and Mining (Australia)
T. J. Cudahy, CSIRO Div. of Exploration and Mining (Australia)
Jonathan F. Huntington, CSIRO Div. of Exploration and Mining (Australia)
P. M. Connor, CSIRO Div. of Exploration and Mining (Australia)
P. Mason, CSIRO Div. of Exploration and Mining (Australia)
R. N. Phillips, CSIRO Div. of Exploration and Mining (Australia)
Peter Hausknecht, DLR (Germany)


Published in SPIE Proceedings Vol. 3059:
Advances in Laser Remote Sensing for Terrestrial and Oceanographic Applications
Ram Mohan Narayanan; James E. Kalshoven, Editor(s)

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