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Proceedings Paper

Identification of contaminated soil using CO2 laser reflectance ratios
Author(s): Ram Mohan Narayanan; Mark T. Pflum; Jon D. Schmeeckle
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Paper Abstract

A mid-infrared laser reflectance sensor operating within the 9-11 micrometer wavelength range was used to study the reflectance characteristics of soil contaminated with various commercially available chemical liquid materials. Measurements were made at ten wavelengths and three incidence angles under both co-polarized and cross-polarized scatter conditions. Data were gathered from bare soil, as well as soil saturated with anti-freeze/coolant, unused motor oil, and used motor oil. Calibration was performed using a Labsphere Diffuse Reflectance Standard of 94% nominal reflectivity. The measurements were used to compute reflectance ratios, i.e., ratios of reflectivities at various two-wavelength combinations. Our study indicates that it is possible to detect the presence of as well as to identify the type of contamination present in the soil by computing reflectance ratios at judiciously selected wavelengths. Use of wavelength ratios obviates the need for absolute calibration if the atmospheric transmission characteristics are the same at the two probing wavelengths. This technique is well-suited for standoff detection of contaminated soil.

Paper Details

Date Published: 3 July 1998
PDF: 12 pages
Proc. SPIE 3382, Advances in Laser Remote Sensing for Terrestrial and Hydrographic Applications, (3 July 1998); doi: 10.1117/12.312623
Show Author Affiliations
Ram Mohan Narayanan, Univ. of Nebraska/Lincoln (United States)
Mark T. Pflum, Univ. of Nebraska/Lincoln (United States)
Jon D. Schmeeckle, Univ. of Nebraska/Lincoln (United States)

Published in SPIE Proceedings Vol. 3382:
Advances in Laser Remote Sensing for Terrestrial and Hydrographic Applications
Ram Mohan Narayanan; James E. Kalshoven Jr., Editor(s)

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