Method and Apparatus for Safety Testing Optical Systems for Hazardous Locations

Details

• Personal Author:
  Dubaniewicz, Thomas H. Jr. ; Green GM
• Description:
  A method of determining the ignition characteristics of an optical source emitting optical power into a hazardous environment includes providing a chamber and a tapered optical fiber having an input end and an output end, wherein the output end has a smaller diameter than the input end. The output end of the tapered fiber is disposed within the chamber and the input end of the tapered fiber is optically coupled to the optical source for receiving optical power therefrom. Power is first applied to the tapered fiber and the power output at the tapered fiber output end measured. Then a target is applied to the tapered fiber output end, and the chamber is filled with the desired gas/air mixture and the same power applied to the tapered fiber. After power is applied for a period of time, a determination is made whether or not the gas/air mixture ignited. [Description provided by NIOSH]
• Subjects:
  Coal Coal Mining Mining Occupational Health Safety
• Keywords:
  Coal-mining Fiber-optics Flammable-gases Ignition-systems Lasers Underground-mining
• Series:
  Mining Publications
• Document Type:
  Text
• Genre:
  Other
• Place as Subject:
  OSHA Region 3 ; Pennsylvania
• CIO:
  National Institute for Occupational Safety and Health (NIOSH)
• Division:
  PRL - Pittsburgh Research Laboratory
• Topic:
  Workplace Safety & Health
• Location:
  North America
• Pages in Document:
  1-13
• NIOSHTIC Number:
  nn:20024292
• Citation:
  US Pat 6,667,801 2003 Dec; :1-13
• Contact Point Address:
  NIOSH Pittsburgh Research Laboratory, P.O. Box 18070, Pittsburgh, PA 15236
• CAS Registry Number:
  Methane (CAS RN 74-82-8)
• Federal Fiscal Year:
  2004
• NORA Priority Area:
  Disease and Injury: Traumatic Injuries
• Peer Reviewed:
  False
• Source Full Name:
  United States Patent 6,667,801
• Collection(s):
  National Institute for Occupational Safety and Health
• Main Document Checksum:
  urn:sha-512:e25faf96ca7f3557f42c71efed43321cbfe8aaf8eb7eb8ba87d78ebc38be85dc7162cf7bd2d2958282042371989b9badb9d7c5f3c34a4dd96da984509c2d20de
• Download URL:
  https://stacks.cdc.gov/view/cdc/220765/cdc_220765_DS1.pdf
• File Type:
  [PDF - 1.06 MB ]