Airborne and laboratory remote sensing applications of the CSIRO CO2 laser spectrometer MIRACO2LAS

L. B. Whitbourn; T. J. Cudahy; Jonathan F. Huntington; P. M. Connor; P. Mason; R. N. Phillips; Peter Hausknecht

doi:10.1117/12.277604

2 July 1997 Airborne and laboratory remote sensing applications of the CSIRO CO₂ laser spectrometer MIRACO₂LAS

L. B. Whitbourn, T. J. Cudahy, Jonathan F. Huntington, P. M. Connor, P. Mason, R. N. Phillips, Peter Hausknecht

Proceedings Volume 3059, Advances in Laser Remote Sensing for Terrestrial and Oceanographic Applications; (1997) https://doi.org/10.1117/12.277604
Event: AeroSense '97, 1997, Orlando, FL, United States

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.

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L. B. Whitbourn, T. J. Cudahy, Jonathan F. Huntington, P. M. Connor, P. Mason, R. N. Phillips, and Peter Hausknecht "Airborne and laboratory remote sensing applications of the CSIRO CO₂ laser spectrometer MIRACO₂LAS", Proc. SPIE 3059, Advances in Laser Remote Sensing for Terrestrial and Oceanographic Applications, (2 July 1997); https://doi.org/10.1117/12.277604

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