Apparatus to measure select properties of a moving sheet

Details Apparatus to measure select properties of a moving sheet Apparatus to measure select properties of a moving sheet

1979-12-05

1981-07-07

Rosenberger, R. A.

Optics: measuring and testing

By monitoring of webs or thread

For flaws or imperfections

250571, 356446, 356243, G01N 2147

Patent

active

042771773

ABSTRACT:
An apparatus to measure select properties such as color, brightness or gloss, of a moving sheet, is insensitive to flutter in the sheet. The apparatus comprises a housing to one side of said sheet. A source is located in the housing; the source is capable of emitting a beam of electromagnetic radiation which is aligned to impinge the sheet. The radiation is selected such that it is capable of being absorbed and being reflected by the select properties of the sheet. A collector is also located in the housing; the collector is capable of receiving a portion of the beam reflected from the sheet. A detector capable of measuring the select properties of the sheet based upon the radiation received by the collector is also provided. The housing is held at a constant distance from the sheet by a stream of fluid from the housing directed to impinge the sheet in a direction substantially perpendicular to the sheet. A standardization member is to the other side of the sheet. The standardization member is also held at a constant distance from the sheet by a stream of fluid from the member directed to impinge the sheet along a direction substantially perpendicular to the sheet and in linear alignment with the stream of fluid from the housing.

REFERENCES:
patent: 1978589 (1934-10-01), McFarlane
patent: 3476482 (1969-11-01), Howard
patent: 3793524 (1974-02-01), Howarth
patent: 3890049 (1975-06-01), Collins et al.
patent: 4029420 (1977-06-01), Simms
patent: 4033698 (1977-07-01), Demsky et al.

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