Details:

Personal Author:
McHugh, Edward L. ; Girard, Jami M. ; Denes, Louis J.
McHugh, Edward L. ; Girard, Jami M. ; Denes, Louis J. Less -
Corporate Authors:
National Institute for Occupational Safety and Health.
Conference Authors:
International Conference on Intelligent Processing and Manufacturing of Materials (3rd : 2001 July 29 - August 2 : Vancouver, British Columbia. Canada)
Description:
A prototype portable hyperspectral imager that operates in the visible and near-infrared ranges of the electromagnetic spectrum was field tested at an open-pit mine. The tests were sponsored by the Spokane Research Laboratory, National Institute for Occupational Safety and Health, as part of an investigation of remote sensing technologies for use in detecting and monitoring conditions in surface mines that could lead to catastrophic slope failure. The spectro-polarimetric imager, built at the Carnegie Mellon Research Institute, employs an acousto-optical tunable filter (AOTF) to control wavelength, a phase retarder to measure polarization signatures, and a digital camera and computer to capture data. The spectral range of the instrument is 450 to 1000 nm at 10-nm intervals. High-resolution hyperspectral images of highwalls, outcrops, hand samples, and drill core were collected in the field. Spectra from the images closely matched those of specific minerals present and were used to classify the images. The field tests were designed to examine the feasibility of using spectral imaging to assist in compiling objective geologic maps of mine highwalls and other hazardous slopes. Results illustrate the capability of the method to discriminate materials within the image, validating the concept of simplified spectral imaging. A contributing factor in many slope failures is the presence and distribution of mechanically incompetent, clay-rich altered rock in slope faces. Spectral features of clays and other minerals are more distinctive in the short-wave and mid-infrared part of the spectrum; the capabilities of the instrument need to be extended into this range to apply the AOTF-based technology to common geologic materials. A field-portable hyperspectral imager could find broad application in remotely identifying diverse materials from solids and coatings to gases.
Subject:
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Mining

Source:
Proceedings of the Third International Conference on Intelligent Processing and Manufacturing of Materials, IPMM - 2001, Vancouver, British Columbia. Canada, July 29 - August 2, 2001. Meech JA, Veiga SM, Viega MM, LeClair SR, Maguire JF, eds., Vancouver, B.C., Canada: Intelligent Processing and Manufacturing of Materials, 2001 Jul; :1-10
Document Type:
Book Chapter
Genre:
Conference Publications
Collection(s):
National Institute for Occupational Safety and Health
Main Document Checksum:
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urn:sha256:b404a18fbc4e7d57e89ba403b7e2681d3adae40514c21c74777054235b1dfd8b
File Type:

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