The system indicated in the figure provides a sensitive method of measuring particulate quantity in the air. This enables an index to be established for comparing particulate contamination levels of industrial atmospheres. The flow of air containing particulate matter over or through metal or plastic surfaces induces a charge on the surfaces. The static charge generated is proportional to both the flow rate and the particulate content. If the flow rate is held constant, the static charge generated will be proportional to the particulate content. The system consists of a flat plastic flow device with a conduit passage of a size to allow for a sufficiently-high flow rate, a vacuum pump, and an electric field meter for measuring the electrostatic charge. The device could be made portable by encompassing the electric field meter, the vacuum pump, and the flow device in one battery-operated package. Also, a probe containing the flow device and the electric field meter sensor could be connected by vacuum and electrical signal lines to the main unit. In addition, a recorder could be connected for continuous monitoring.

  • Supplemental Notes:
    • This article appeared in the publication: Analytical Techniques: A Compilation.
  • Corporate Authors:

    National Aeronautics and Space Administration

    400 Maryland Avenue, SW
    Washington, DC  United States  20546
  • Authors:
    • Johnston, J B
  • Publication Date: 1975-1

Media Info

Subject/Index Terms

Filing Info

  • Accession Number: 00128518
  • Record Type: Publication
  • Report/Paper Numbers: NASA CR-2028
  • Contract Numbers: MFS-24402, NPO-11612, MFS-16968
  • Files: TRIS
  • Created Date: Apr 21 1976 12:00AM