Optics: measuring and testing – By configuration comparison – With photosensitive film or plate
Patent
1986-09-22
1988-09-27
Rosenberger, R. A.
Optics: measuring and testing
By configuration comparison
With photosensitive film or plate
356382, G01B 1106
Patent
active
047737603
ABSTRACT:
The invention concerns a procedure for measuring the thickness of a film-like or sheet-like web. In the procedure, measuring heads located on both sides of the web and detectors provided in these are employed to measure the distances of the measuring heads from the respective surface of the web. Moreover, the distance from each other of the measuring heads is measured and from the three results of measurement thus obtained, the thickness of the web is calculated. The invention furthermore concerns a measuring means for implementing the procedure, this means comprising measuring heads located on both sides of the web, at a distance from the web, these measuring heads being provided with detectors for measuring the distance of each measuring head from the web surface on the respective side and with a detector for measuring the distance between the measuring heads.
REFERENCES:
patent: 3565531 (1971-02-01), Kane et al.
patent: 3732016 (1973-05-01), Deshayes et al.
patent: 4276480 (1981-06-01), Watson
patent: 4298286 (1981-11-01), Maxey et al.
patent: 4358960 (1982-11-01), Porter
Cooper Crystal
Rosenberger R. A.
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