Report of Investigations 9640: A Second-Generation Remote Optical Methanometer

Details

• Journal Article:
  National Institute for Occupational Safety and Health
• Personal Author:
  Franks, Robert A. ; Opferman, John J. ; Friel, Gene F. ; Edwards, John C.
• Description:
  The theory of operation of second generation remote optical methanometer (ROM) and initial testing of the new prototype were described. The ROM operated on the principle of differential absorption of a fundamental absorption band of methane (74828) centered at 3.31 micrometers in the infrared region of the spectrum. In comparison to the previous prototypes, the new instrument replaced the two band pass differential absorption technique of measurement with a single filter gas correlation technique and a refinement of the amplifier and gating circuitry used within the unit. The results were a more accurate isolation of the methane spectral absorption band studied. A specially designed 0.4 meter diameter variable length gas mixing tunnel was constructed and instrumented with methane sampling capability to calibrate the ROM. Experiments demonstrated the ability of the detector to respond to various conditions of methane at distances as great as 12 meters. Thermal radiation generated within the instrument is the controlling factor in the drift of the output signal and therefore the reliability of the instrument. Several approaches to reduce the extraneous radiation interfering with the infrared detector were described, including the installation of a fan in the instrument and thermoelectric coolers on the detector's heat sink. The authors conclude that implementing this technology may significantly improve the safety of miners. [Description provided by NIOSH]
• Content Notes:
  Robert A. Franks, John J. Opferman, Gene F. Friel, John C. Edwards.
  
  Also available via the World Wide Web.
  
  Includes bibliographical references (p. 9).
  
  
• Subjects:
  Environmental Monitoring Explosions Hazardous Substances Mining Occupational Health Safety
• Keywords:
  NIOSH-Author; Gas-detectors; Mining-industry; Safety-equipment; Air-quality-monitoring; Explosive-gases; Air-quality-measurement; Toxic-gases; Underground-mining
• Source:
  Pittsburgh, PA: U.S. Department of Health and Human Services, Public Health Service, Centers for Disease Control and Prevention, National Institute for Occupational Safety and Health, DHHS (NIOSH) Publication No. 97-126, (RI 9640), 1997 May; :1-9
• Series:
  NIOSH Numbered Publications
• Subseries:
  Report of Investigations
• ISSN:
  1066-5552
• Publisher:
  National Institute for Occupational Safety and Health
• Document Type:
  Text
• Genre:
  Report
• 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:
  13 pdf pages
• NIOSHTIC Number:
  nn:00238252
• NTIS Accession Number:
  PB97-165039
• CAS Registry Number:
  Methane (CAS RN 74-82-8)
• Federal Fiscal Year:
  1997
• Peer Reviewed:
  False
• Collection(s):
  National Institute for Occupational Safety and Health
• Main Document Checksum:
  urn:sha-512:3e8c30bd6569a3d2c434a70ceb07dcb24acf4f5f02c0907fdcf30c80e7df2a509a1020dd6c938d6fb1e2e702bdf92ec8ae87b2480ec90372dccd7fa57bceabda
• Download URL:
  https://stacks.cdc.gov/view/cdc/6353/cdc_6353_DS1.pdf
• File Type:
  [PDF - 827.07 KB ]