Continuous Optical Monitoring of Asbestos in Air

Details

• Description:
  The development of a continuous optical monitor for determining airborne asbestos (1332214) fibers is described. The initial design of the device is reviewed along with later modifications implemented to increase sensitivity and specificity. The final device consists of eight platinum wire electrodes, a glass tube, and a helium neon laser. Two high voltage transformers energized with 400 hertz sinusoidal voltages also are used. The electric field within the glass tube is analyzed by a computer. For sampling, the laser beam shines down the glass tube, and light reflected by the particles within the lumen of the tube passes up through the aperture of the the photomultiplier cathode. Air is drawn up through the tube at an adjustable flow rate. The glass tube does not distort the electric field, and a uniform electric current ensure that polarized fibers will not migrate to the tube walls and that the forces on the fibers will be the same anywhere within the lumen. [Description provided by NIOSH]
• Subjects:
  Air Pollutants, Occupational Air Pollution, Indoor Asbestos Dust Environmental Monitoring Occupational Health Particulate Matter Safety
• Keywords:
  Air-contamination Air-sampling-equipment Analytical-instruments Asbestos-dust Control-technology Equipment-design Fibrous-bodies NIOSH-Grant Optic-system
• Series:
  Grant Final Reports
• Document Type:
  Text
• Funding:
  Grant
• Genre:
  Final Grant Report
• Place as Subject:
  Connecticut ; OSHA Region 1
• CIO:
  National Institute for Occupational Safety and Health (NIOSH)
• Division:
  OEP - Office of Extramural Programs
• Topic:
  Workplace Safety & Health
• Location:
  North America
• Pages in Document:
  1-6
• NIOSHTIC Number:
  nn:00116184
• NTIS Accession Number:
  PB88-247598
• Citation:
  The John B. Pierce Foundation of Connecticut, Incorporated, 1980 Aug; :1-6
• Contact Point Address:
  Biophysics Division John B Pierce Fdn Laboratory 290 Congress Avenue New Haven, Conn 06519
• CAS Registry Number:
  Asbestos (CAS RN 1332-21-4)
• Federal Fiscal Year:
  1980
• NORA Priority Area:
  Research Tools and Approaches: Control Technology and Personal Protective Equipment
• Performing Organization:
  John B. Pierce Foundation Lab, Inc., New Haven, Connecticut
• Peer Reviewed:
  False
• Start Date:
  19770915
• Source Full Name:
  The John B. Pierce Foundation of Connecticut, Incorporated
• End Date:
  19800831
• Collection(s):
  National Institute for Occupational Safety and Health
• Main Document Checksum:
  urn:sha-512:023b7be5f84ada49d519296adc037539560799c76075938ab47bfe922388d5ea4321e1d7381fd9922f96ec43bb4573f9658082a353c99564d13cc3791f02d501
• Download URL:
  https://stacks.cdc.gov/view/cdc/217705/cdc_217705_DS1.pdf
• File Type:
  [PDF - 322.62 KB ]