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Continuous Optical Monitoring of Asbestos in Air,


PB88247598

Publication Date 1980
Personal Author Stolwijk, J. A. J.
Page Count 8
Abstract A continuous optical monitor for the identification and counting of asbestos (1332214) fibers in ambient air, in occupational and residential environments was developed. Early designs consisted of a fiberglass tube with an internal diameter of 1.0 centimeter and a length of 8 centimeters with four internal electrodes. A 2 milliwatt He/Ne laser was positioned down the center of the tube. External air was sucked into the tube and polarizable fibers caused to spin at the quadrature frequency reflecting the laser light at right angles to the long axis of the fiber. A photomultiplier captured the pulses of light generated and fed the data to a small computer. One drawback of the system was that fiberglass and samples of different types of asbestos produced output signals which were very similar. A new design was developed which employed eight electrodes made from round platinum wires. Long fibers were distinguished from short fibers by the narrowness of the beam reflected.
Keywords
  • Asbestos
  • Air pollution
  • Hazardous materials
  • Fibers
  • Lasers
  • Air pollution monitors
  • Occupational safety and health
Source Agency
  • National Institute for Occupational Safety and Health
NTIS Subject Category
  • 68A - Air Pollution & Control
  • 68G - Environmental Health & Safety
Corporate Authors John B. Pierce Foundation Lab., New Haven, CT.; National Inst. for Occupational Safety and Health, Cincinnati, OH.
Supplemental Notes Sponsored by National Inst. for Occupational Safety and Health, Cincinnati, OH.
Document Type Technical Report
NTIS Issue Number 198823
Continuous Optical Monitoring of Asbestos in Air,
Continuous Optical Monitoring of Asbestos in Air,
PB88247598

  • Asbestos
  • Air pollution
  • Hazardous materials
  • Fibers
  • Lasers
  • Air pollution monitors
  • Occupational safety and health
  • National Institute for Occupational Safety and Health
  • 68A - Air Pollution & Control
  • 68G - Environmental Health & Safety
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