Apparatus and process for measuring physical parameters of sheet

Details Apparatus and process for measuring physical parameters of sheet Apparatus and process for measuring physical parameters of sheet

1986-07-14

1988-08-23

Howell, Janice A.

Radiant energy

Invisible radiant energy responsive electric signalling

Infrared responsive

250341, 250349, G01N 2135, G01N 2186

Patent

active

047663154

ABSTRACT:
An apparatus and process for measuring physical parameters of sheet material via infrared absorption phenomena is disclosed. The invention employs an integral filter-detector package comprising at least two optical filter-detector combinations. The package is contained within a conventional sensor housing which traverses back and forth across the sheet material. The package may comprise an additional filter-detector combination that is selected to produce a detector response having a significantly higher signal-to-noise ratio than the response of remaining detectors. The former response is used in combination with synchronous detectors to provide a reference of the general shape and phase of the latter responses in the absence of high noise.

REFERENCES:
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patent: 3405268 (1968-10-01), Brunton
patent: 3793524 (1974-02-01), Howarth
patent: 4052615 (1977-10-01), Cho
patent: 4230945 (1980-10-01), Meir et al.
patent: 4300049 (1981-11-01), Sturm
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patent: 4490612 (1984-12-01), Tormala
patent: 4560875 (1985-12-01), Crowder
patent: 4577104 (1986-03-01), Sturm
patent: 4582520 (1986-04-01), Sturm

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