Direct-Reading Measurement of Fiber Length/Diameter Distributions

Details

• Personal Author:
  Baron, Paul A. ; Deye GJ ; Fernback, Joseph E. ; Jones, William G.
• Description:
  A new technique for classifying fibers according to length has opened up opportunities for improving fiber measurement technology. The classification principle is dielectrophoresis, which moves conductive fibers at a velocity proportional to the square of their length. Even non-conductive fibers can be made sufficiently conductive by increasing the humidity in the classifier. A device based on this principle has been constructed. It can classify fibers from a broad distribution into length distributions with CVs in the range of 0.2-0.3 and with mean lengths selectable from about 4 um to >50 um. To complement this device, diameter classification readily can be achieved by gravitational or inertial techniques in combination with length classification. An intertial classifier was used to produce relatively monodisperse diameter fibers in the aeordynamic diameter range of 3 - 7 um. This device was used to calibrate the response of the Aerodynamic Particle Sizer (APS) so that real-time diameter distributions were obtained for each length distribution from the dielectrophoretic length classifier. By varying the voltage on the length classifier a length/diameter distribution can be produced in a matter of minutes. [Description provided by NIOSH]
• Subjects:
  Occupational Health Particulate Matter Safety
• Keywords:
  Author Keywords: Fiber Dielectrophoresis Fiber Classification Fiber Deposition Fiber Measurement Fiber Size Distribution Microscopy Sampling Sampling Methods Sensitivity Testing
• ISBN:
  0803126166
• Publisher:
  American Society for Testing and Materials
• Document Type:
  Text
• Genre:
  Proceedings
• Place as Subject:
  Ohio ; OSHA Region 5
• CIO:
  National Institute for Occupational Safety and Health (NIOSH)
• Division:
  DPSE - Division of Physical Sciences and Engineering
• Topic:
  Workplace Safety & Health
• Location:
  North America
• Pages in Document:
  147-155
• NIOSHTIC Number:
  nn:20020883
• Citation:
  Advances in Environmental Measurement Methods for Asbestos, ASTM/STP No. 1342. ME Beard, HL Rook, eds. Boulder, CO: American Society for Testing and Materials, 2000 Jan; :147-155
• Editor(s):
  Beard ME; Rook HL
• Federal Fiscal Year:
  2000
• Peer Reviewed:
  False
• Source Full Name:
  Advances in Environmental Measurement Methods for Asbestos. ASTM/STP No. 1342.
• Collection(s):
  National Institute for Occupational Safety and Health
• Main Document Checksum:
  urn:sha-512:4615e288be9832e6b402f9fdedee9041ef4c0c578bb25d41c7240aff37b6cfdab02cf8424d6872a6f071b40f17d8a912a2a793fd6509db097d28ebbf0d3fb8a5
• Download URL:
  https://stacks.cdc.gov/view/cdc/198537/cdc_198537_DS1.pdf
• File Type:
  [PDF - 428.18 KB ]