Accession Number : ADD006098

Title :   Roughness Diagnostic Tool.

Descriptive Note : Patent,


Personal Author(s) : Mittleman,John

Report Date : 09 Jan 1979

Pagination or Media Count : 7

Abstract : 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)

Descriptors :   *Patents, *Underwater tools, Surface roughness, Measuring instruments, Comparators, Ship hulls, Fouling organisms, Hydrodynamics, Diagnosis(General), Test methods, Phase measurement, Disks, Rotation, Displacement

Subject Categories : Marine Engineering
      Test Facilities, Equipment and Methods

Distribution Statement : APPROVED FOR PUBLIC RELEASE