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US Patent: 4,133,204
Roughness Diagnostic Tool
Patentee:
John Mittleman - Panama City, FL

USPTO Classifications:
73/105

Tool Categories:
layout tools : special purpose gauges

Assignees:
The United States of America as represented by the Secretary of the Navy - Washington, DC

Manufacturer:
Not known to have been produced

Witnesses:
none listed

Patent Dates:
Applied: May 15, 1978
Granted: Jan. 09, 1979

Patent Pictures:
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Description:
Richard S. Sciascia & Harvey A. David - patent attorneys

Abstract

A roughness measuring tool wherein a pair of discs are mounted in spaced allel 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 beteen 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.

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