Radiant energy – Photocells; circuits and apparatus – Optical or pre-photocell system
Patent
1989-09-11
1991-03-19
Nelms, David C.
Radiant energy
Photocells; circuits and apparatus
Optical or pre-photocell system
356381, 324230, G01V 904
Patent
active
050013564
ABSTRACT:
A sheet thickness measuring apparatus for measuring the thickness of a sheet comprises a metallic backup surface for supporting the sheet, a magnetic field utilization sensor arranged above the said metallic backup surface for measuring a distance up to the metallic backup surface in a non-contact form, an optical sensor arranged above the metallic backup surface for measuring a distance up to the metallic backup surface or a top surface of the sheet supported on the metallic backup surface in a non-contact form, and means for computing the thickness of the sheet on the basis of the distance measured by the magnetic field utilization sensor and the distance measured by the optical sensor. The sheet thickness measuring apparatus may further comprise storage means for storing correcting measured value based on distance measured value measured along the metallic backup surface by at least the magnetic field utilization sensor of the magnetic field utilization sensor and the optical sensor in the state that the sheet is not placed, and correcting means for correcting at least the distance measured value measured by the magnetic field utilization sensor of distance measured values measured by the magnetic field utilization sensor and the optical sensor in the state that the sheet is placed on the metallic backup surface with the correcting measured value stored in the storage means.
REFERENCES:
patent: 4849694 (1989-07-01), Coates
Hsia Sherrie
Meisan Co., Ltd.
Nelms David C.
LandOfFree
Sheet thickness measuring apparatus does not yet have a rating. At this time, there are no reviews or comments for this patent.
If you have personal experience with Sheet thickness measuring apparatus, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Sheet thickness measuring apparatus will most certainly appreciate the feedback.
Profile ID: LFUS-PAI-O-2012138