Sheet material sensor compensation

Details Sheet material sensor compensation Sheet material sensor compensation

1991-02-15

1992-03-24

Hannaher, Constantine

Radiant energy

Invisible radiant energy responsive electric signalling

With means to inspect passive solid objects

250308, 2503591, 73159, G01B 504, G01B 506, G01N 2300

Patent

active

050991256

ABSTRACT:
A device for measuring the gap between the radiation source and the radiation sensor of a basis weight gauge. A caliper sensor measures the thickness of a sheet of material as it passes through the gap, while the caliper contact shoe rides on the sheet and urges it against a first side of the gap. A linear variable differential transformer measures the distance between a reference point on the contact shoe and the opposed side of the gap. The gap dimension is the sum of the sheet thickness, the distance between the caliper reference point and the second side of the gap, and a readily measurable constant.

REFERENCES:
patent: 4678915 (1989-07-01), Dahlquist et al.
patent: 5010766 (1991-04-01), Tuppo
patent: 5021666 (1991-06-01), Reber

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