3922093 is referenced by 83 patents and cites 7 patents.

An apparatus is disclosed for measuring the roughness of a surface with improved accuracy. The apparatus, several embodiments of which are disclosed, includes a device for illuminating a surface being studied and a photosensitive detector for determining the maximum intensity of light reflected on the surface. Apparatus is also provided for detemining two points at which the intensity of the reflected light has fallen to a selected fraction of its maximum intensity. The distance between these two points is then measured along the intersection of the plane of incidence of the illuminating beam with a plane perpendicular to the direction of specular reflection. This distance provides an accurate quantitative measure of the roughness of the surface being studied.

Title
Device for measuring the roughness of a surface
Application Number
05/416,649
Publication Number
3922093
Application Date
November 16, 1973
Publication Date
November 25, 1975
Inventor
Mottier Francois M
Dandliker Rene
Agent
Oblon Fisher Spivak McClelland & Maier
Assignee
BBC Brown Boveri & Cie
IPC
G01B 11/30
G01B 11/30
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