John J Domalewski

US Patent:

54970989, Mar 5, 1996

Filed:

Nov 10, 1994

Appl. No.:

8/338007

Inventors:

Garret G. Heil - St. Peters MO
John J. Domalewski - University City MO
Frederick C. Wear - St. Louis MO
Stephen C. Buckner - St. Ann MO
Arthur C. Lind - Chesterfield MO
Jeffry K. Hoyt - St. Louis MO

Assignee:

McDonnell Douglas Corporation - St. Louis MO

International Classification:

G01R 2704
G01N 2200

US Classification:

324637

Abstract:

A sensor and method for identifying the surface properties of a workpiece includes a microstrip sensor for transmitting and receiving microwave signals and surface properties determining means for determining the surface properties of the workpiece, including the type of material from which the workpiece is constructed, based upon the strength of the detected microwave signals. The surface properties identifying sensor also includes a microwave generator for producing microwave signals at a predetermined frequency for transmission by the microstrip sensor and a detector for detecting the microwave signals received by the microstrip sensor from the workpiece. Thus, workpieces comprised of a conductive material, an insulative material and a conductive material coated with a radar absorbing material can be readily distinguished by the surface properties identifying sensor and method.