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Title: Non-contact capacitance based image sensing method and system

A system and a method is provided for imaging desired surfaces of a workpiece. A sensor having first and second sensing electrodes which are electrically isolated from the workpiece is positioned above and in proximity to the desired surfaces of the workpiece. An electric field is developed between the first and second sensing electrodes of the sensor in response to input signals being applied thereto and capacitance signals are developed which are indicative of any disturbances in the electric field as a result of the workpiece. An image signal of the workpiece may be developed by processing the capacitance signals. The image signals may provide necessary control information to a machining device for machining the desired surfaces of the workpiece in processes such as deburring or chamfering. Also, the method and system may be used to image dimensions of weld pools on a workpiece and surfaces of glass vials. The sensor may include first and second preview sensors used to determine the feed rate of a workpiece with respect to the machining device. 18 figures.
Issue Date:
OSTI Identifier:
SNL; EDB-95-029159
Patent Number(s):
US 5378994; A
Application Number:
PPN: US 8-163555
Contract Number:
Resource Relation:
Patent File Date: 9 Dec 1993
Country of Publication:
United States
36 MATERIALS SCIENCE; MACHINE TOOLS; PROCESS CONTROL; MATERIALS; MACHINING; IMAGE PROCESSING; MEASURING INSTRUMENTS; CONTROL; PROCESSING; TOOLS 360101* -- Metals & Alloys-- Preparation & Fabrication; 360201 -- Ceramics, Cermets, & Refractories-- Preparation & Fabrication; 360601 -- Other Materials-- Preparation & Manufacture