Electricity: measuring and testing – Impedance – admittance or other quantities representative of... – Distributive type parameters
Patent
1994-11-10
1996-03-05
Wieder, Kenneth A.
Electricity: measuring and testing
Impedance, admittance or other quantities representative of...
Distributive type parameters
324647, 324717, 343700MS, G01R 2704, G01N 2200
Patent
active
054970989
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.
REFERENCES:
patent: 3562642 (1971-02-01), Hohschild
patent: 4123703 (1978-10-01), Robinson
patent: 5072172 (1991-12-01), Stolavczyk et al.
patent: 5334941 (1994-08-01), King
patent: 5376889 (1994-12-01), Milroy et al.
Fact Sheet from Millimeter Wave Technology, Inc., Microwave Reflectometer Model PR-13 (undated).
Buckner Stephen C.
Domalewski John J.
Heil Garret G.
Hoyt Jeffry K.
Lind Arthur C.
Do Diep
McDonnell Douglas Corporation
Wieder Kenneth A.
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