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Optical Systems

Error-compensation-for-measuring-gauges

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Error compensation for measuring gauges

Details

Inventors: Typpo, Pekka M.;
Assignee: Impact Systems, Inc. (San Jose, CA)
Primary Examiner: Yasich; Daniel M.
Assistant Examiner:
Attorney, Agent or Firm: Flehr, Hohbach, Test, Albritton & Herbert

A measuring gauge for error compensation of a measured characteristic of a moving sheet measures X, Y lateral displacement of the upper and lower transducer heads of a moving scanner in a cross direction across the paper. This is accomplished by the use of two pairs of eddy current sensors centered on a target on the opposed transducer head. Such eddy current transducers sense the pairs of edges of an aperture in the opposed transducer. Alternatively, slope portions of the lower transducer head are sensed. Other correction inputs are provided by measuring the distance from each transducer head to the moving sheet to provide a "Z" correction. All of the foregoing are then utilized along with caliper measurements, if necessary, to provide a corrected characteristic.

DETAILED DESCRIPTION It is therefore a general object of the present invention to provide improved error compensation for measuring gauges.
In accordance with the above object there is provided apparatus for measuring a characteristic of a moving sheet material, including a pair of transducers spaced opposite each other with the sheet therebetween and mounted to traverse across the direction of movement of the moving sheet, the transducers being subject to mechanical error in both a lateral relationship (X, Y) and spacing therebetween Z.
The apparatus comprises means for measuring at least the X, Y displacement, including two pairs of eddy current sensors mounted with one transducer and responsive to a target associated with the other transducer for providing X, Y relative displacement data and means as provided for correcting the measured characteristic by use of the X, Y data.

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