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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.
 [1];  [2]
  1. (11048 Malaguena Ln. N.E., Albuquerque, NM 87111)
  2. (4915 Glenwood Hills Dr. N.E., Albuquerque, NM 87111)
Issue Date:
OSTI Identifier:
Novak, James L. (11048 Malaguena Ln. N.E., Albuquerque, NM 87111);Wiczer, James J. (4915 Glenwood Hills Dr. N.E., Albuquerque, NM 87111) SNL
Patent Number(s):
US 5378994
Contract Number:
Research Org:
Country of Publication:
United States
non-contact; capacitance; based; image; sensing; method; provided; imaging; desired; surfaces; workpiece; sensor; electrodes; electrically; isolated; positioned; proximity; electric; field; developed; response; input; signals; applied; thereto; indicative; disturbances; result; signal; processing; provide; control; information; machining; device; processes; deburring; chamfering; dimensions; weld; pools; glass; vials; preview; sensors; determine; feed; rate; respect; desired surfaces; capacitance signals; image signal; applied thereto; electrically isolated; input signals; electric field; input signal; feed rate; sensing electrodes; weld pool; sensing electrode; sensing method; desired surface; image signals; electrically isolate; non-contact capacitance; image dimensions; imaging desired; image sensing; capacitance based; based image; /324/65/173/382/