William Aage Johnsen
Engineers in Parker, CO
License number
Colorado 57937
Issued Date
Jun 11, 1993
Renew Date
Jun 11, 1993
Type
Engineer Intern
Address
Address
6837 No Vlg Rd, Parker, CO 80134
Professional information
Method Of Quantifying The Topographic Structure Of A Surface
US Patent:
5307292, Apr 26, 1994
Filed:
Jun 24, 1992
Appl. No.:
7/903355
Inventors:
Christopher A. Brown - Norwich VT
William A. Johnsen - Parker CO
Patrick D. Charles - Maynard MA
William A. Johnsen - Parker CO
Patrick D. Charles - Maynard MA
International Classification:
G01B 2120, G01B 2130
US Classification:
364564
Abstract:
A fractal-based or "patchwork" method for analyzing topographic data simulates covering the surface of a specimen surface with triangular patches in order to determine the relative surface area which is a function of patch size or scale of observation or interaction. The specimen surface has X and Y horizontal axes and a vertical Z axis. Height data is obtained for each point of a grid network of points on the surface, the points being arranged in parallel rows and the rows being spaced. The specimen surface is defined with triangles having a surface area equal to a preselected patch area value. The total area of the planar triangles is calculated to obtain a total measured area of value. The area of the specimen surface in the X-Y plane that is defined by the triangles is calculated to obtain a total measured area value. The total measured area value is divided by the total projected area value to obtain a relative area value.