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Mining Publication: A Portable Spectro-Polarimetric Imager: Potential Mine Safety and Geologic Applications
Keywords: Infrared analysis Instruments Open pit mining Slope stability
This page is archived for historical purposes and is no longer being maintained or updated. Contact NIOSH Mining if you need an accessible version.
Original creation date: March 1999
Authors: C Sabine, LJ Denes, M Gottlieb, B Kaminsky, P Metes, RT Mayerle, JM Girard
Conference Paper - March 1999
Download PDF Document (0.27 MB)
Proceedings of the Thirteenth International Conference, Applied Geologic Remote Sensing, Vancouver, British Columbia, Canada, 1-3 March 1999; 1:I190-I194
A significant risk factor in assessing and modeling potential catastrophic slope movement in open-pit mines is the presence of argillic alteration in host rocks. High-resolution hyperspectral imagery operating in the visible to shortwave infrared can be a useful tool for identifying and mapping potentially dangerous argillic zones. We have conducted preliminary experiments with a new type of hyperspectral imager that employs an acousto-optic tunable filter, a variable retardation plate and a standard digital camera. The instrument we tested operates in the .5-1.0 micrometer range. A shortwave infrared instrument is planned, and mid-infrared instruments have been designed. An AOTF consists of an acoustic transducer that generates an acoustic wave that propagates through an attached crystalline substance. The wave sinusoidally modulates the refractive index of the crystal, selectively diffracting incident light according to its wavelength. The instrument also measures polarization signatures of reflecting surfaces as well as their spectral properties, opening up new areas of possible research. Images can he acquired and processed at 30 frames/second. The AOTF camera system offers numerous advantages to geologists. It can be used as an airborne imager or as a portable field device to image pit walls, outcrops, rock specimens or drill core. It can be adapted to image polished sections under a microscope, and it could be used in underground workings. Algorithms can produce processed images in real time (e.g., ratio images), and, because it is a camera system, aerial images can be orthorectified.
Image of publication A Portable Spectro-Polarimetric Imager: Potential Mine Safety and Geologic ApplicationsConference Paper - March 1999
Download PDF Document (0.27 MB)
Proceedings of the Thirteenth International Conference, Applied Geologic Remote Sensing, Vancouver, British Columbia, Canada, 1-3 March 1999; 1:I190-I194
See Also
Advances in Remote Sensing Techniques for Monitoring Rock Falls and Slope Failures
Analysis of Bench Crest Performance at the Yellowstone Mine: A Case Study
Applications of Ground-Based Radar to Mine Slope Monitoring
Assessing and Monitoring Open Pit Mine Highwalls
Continuous Wave Laser Ignition Thresholds of Coal Dust Clouds
In-Mine Test of the Bureau of Mines Preproduction Wireless Survey System
Material Properties Affecting the Stability of a 50-Year-Old Rock Dump in an Active Mine
Simplified Hyperspectral Imaging for Improved Geologic Mapping of Mine Slopes
Slope Stability
Technology News 506 - The Sky is Falling!: NIOSH Releases Safety Video for Surface Mining Operations
Technology News 516 - ARMPS-HWM: New Software for Sizing Pillars for Highwall Mining
Page last reviewed: September 21, 2012
Page last updated: September 21, 2012
Content source: National Institute for Occupational Safety and Health, Mining Program
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