A Portable Spectro-Polarimetric Imager: Potential Mine Safety and Geologic Applications

Details

• Personal Author:
  Sabine, Charles ; Denes, Louis J. ; Gottlieb, M. ; Kaminsky, B. ; Metes, P. ; Mayerle, Ronald T. ; Girard, Jami M.
• Corporate Authors:
  National Institute for Occupational Safety and Health
• Description:
  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. Highresolution 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 be 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. [Description provided by NIOSH]
• Subjects:
  Minerals Mining Occupational Health Risk Assessment Risk Factors Safety Spectrum Analysis
• Keywords:
  Ground-control Mine-shafts Mine-workers Mineral-processing Miners Mining-industry Monitoring-systems Risk-analysis Risk-factors Slope-stability Spectrographic-analysis Spectroscopes Statistical-analysis

  More +
• Source:
  Proceedings of the Thirteenth International Conference: Applied Geologic Remote Sensing, Vancouver, BC, March 1-3, 1999. Ann Arbor, MI: ERIM International, Inc., 1999 Mar; :I910-I914
• Series:
  Mining Publications
• Document Type:
  Text
• Genre:
  Proceedings
• Place as Subject:
  Nevada ; OSHA Region 10 ; OSHA Region 3 ; OSHA Region 9 ; Pennsylvania ; Washington
• CIO:
  National Institute for Occupational Safety and Health (NIOSH)
• Division:
  SRL - Spokane Research Laboratory
• Topic:
  Workplace Safety & Health
• Location:
  North America
• NIOSHTIC Number:
  nn:20028189
• Citation:
  Proceedings of the Thirteenth International Conference: Applied Geologic Remote Sensing, Vancouver, BC, March 1-3, 1999. Ann Arbor, MI: ERIM International, Inc., 1999 Mar; :I910-I914
• Federal Fiscal Year:
  1999
• Peer Reviewed:
  False
• Collection(s):
  National Institute for Occupational Safety and Health
• Main Document Checksum:
  urn:sha-512:9d9e677f428b267af2ebd50f1aad988a9247bc891a009ef5119d120de2204c052e4fc67a3765ff298e160ddb7a1bb2dd929876045e5a12857684e2ab13ac6e98
• Download URL:
  https://stacks.cdc.gov/view/cdc/9189/cdc_9189_DS1.pdf
• File Type:
  [PDF - 267.74 KB ]