Device for calibrating an apparatus for measuring the formation

Details Device for calibrating an apparatus for measuring the formation Device for calibrating an apparatus for measuring the formation

1988-05-20

1990-06-05

Westin, Edward P.

Radiant energy

Photocells; circuits and apparatus

Optical or pre-photocell system

356429, 356432, G01N 2186

Patent

active

049316591

ABSTRACT:
A device for calibrating an apparatus for measuring the formation index of a sheet of paper in which an emitted light beam is directed through the sheet of paper and detected and electronically processed into a modulated output signal. The device has a frosted glass for diffusing the measuring beam of light and an opaque rod mounted for rotation in and out of the beam of light so as to provide a modulation of the detected light of a known amount which can then be used to calibrate the measuring apparatus by adjusting the various parameters of the apparatus to yield the desired known output modulation.

REFERENCES:
patent: 3803414 (1974-04-01), Van Horne et al.
patent: 4224513 (1980-09-01), Casey et al.
patent: 4231663 (1980-11-01), Phillippi
patent: 4319847 (1982-03-01), Howarth

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