Non-contact capacitance based image sensing method and system

Patent · Tue Jan 25 00:00:00 EST 1994

OSTI ID:5264991

Novak, J L; Wiczer, J J

A system and a method for imaging desired surfaces of a workpiece is described. 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.

• DOE Contract Number: AC04-76DP00789
• Assignee: SNL; EDB-94-064066
• Patent Number(s): US 5281921; A
• Application Number: PPN: US 7-514051
• OSTI ID: 5264991
• Resource Relation: Patent File Date: 24 Apr 1990
• Country of Publication: United States
• Language: English

Related Subjects

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FABRICATION
JOINING
MEASURING INSTRUMENTS
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