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Optical Engineering

Diffractive optical element-based glossmeter for the on-line measurement of normal reflectance on a printed porous coated paper
Author(s): Antti Oksman; Kalle Kuivalainen; Kai-Erik Peiponen; Carl-Mikael Tag; Mikko Juuti; Rauno Mattila; Eero Hietala; Patrick A. C. Gane
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Paper Abstract

Gloss of a product, such as print gloss, is mainly inspected with conventional white light glossmeters both at laboratory or production facilities. However, problems occur in conventional gloss measurement when the inspected surface is vertically moved in the plane of incidence and reflection or when the measurement area is small or curved. For a partial solution to these problems, we have previously introduced diffractive optical element-based glossmeters (DOGs) for the gloss inspection in laboratories and off-line use. We present a new construction of DOG, termed μDOG 1D, for the one-dimensional on-line print gloss measurement, in the form of the reflectance determination normal to the surface. The function of the glossmeter is demonstrated by laboratory tests and on-line measurements at a heat-set web offset printing machine. It is shown that gloss (i.e., normal reflectance) and minute gloss variation of papers and prints can be measured at the printing line using the glossmeter. This glossmeter is expected to be useful in real-time monitoring of the gloss and surface-specific absorption not only in the printing industry but also in inspection of products in other industrial sectors, such as metal finishing, laminating, paper, and construction materials manufacturing.

Paper Details

Date Published: 1 April 2011
PDF: 10 pages
Opt. Eng. 50(4) 043606 doi: 10.1117/1.3567057
Published in: Optical Engineering Volume 50, Issue 4
Show Author Affiliations
Antti Oksman, Univ. of Eastern Finland (Finland)
Kalle Kuivalainen, Univ. of Eastern Finland (Finland)
Kai-Erik Peiponen, Univ. of Eastern Finland (Finland)
Carl-Mikael Tag, Forest Pilot Ctr. Oy (Finland)
Mikko Juuti, VTT Technical Research Ctr. of Finland (Finland)
Rauno Mattila, VTT Technical Research Ctr. of Finland (Finland)
Eero Hietala, VTT Technical Research Ctr. of Finland (Finland)
Patrick A. C. Gane, Aalto Univ. (Finland)

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