The patent application relates to a roughness measuring tool wherein a pair of discs are mounted in spaced parallel relation for rotation by a motor about a common axis with a face of only one of the discs being exposed to a layer of fluid contacting a surface to be tested. A torsionally resilient coupling between the discs permits rotational displacement due to a difference in hydrodynamic drag thereon. The displacement is sensed as a phase difference between signals generated by rotation of the discs and a phase signal is applied to a function generator, the output of which is displayed as a figure of merit of test surface condition. (Author)

  • Supplemental Notes:
    • Availability: This Government-owned invention available for U.S. licensing and, possibly, for foreign licensing. Copy of patent (4,133,204) available Commissioner of Patents, Washington, DC 20231 $0.50; or NTIS as AD-D00609818ST.
  • Corporate Authors:

    Department of the Navy

    The Pentagon
    Washington, DC  United States  20350
  • Authors:
    • Mittleman, J
  • Publication Date: 1978-5-15

Media Info

  • Pagination: 14 p.

Subject/Index Terms

Filing Info

  • Accession Number: 00191542
  • Record Type: Publication
  • Source Agency: National Technical Information Service
  • Report/Paper Numbers: PAT-APPL-906 180
  • Files: TRIS
  • Created Date: May 26 1979 12:00AM