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Proceedings Paper

The experimental characterization of the absorption and scatter properties of photopolymers
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Paper Abstract

In this paper we studied the photosensitivity and scatter properties of several types of photopolymers that are used in the printing industry. We applied different measurement methodologies to experimentally characterize both the absorption and scatter properties of the photopolymers. In a first part we measured the absorption spectra of different unexposed photopolymers in the range between 350 and 1600 nm. From these spectra we calculated the absorbance coefficients. After this, we repeated this procedure for the cured material which we obtained by illuminating the photopolymers with a laser source. We investigated the absorption properties for different illumination times in the range between 0 and 2000 ms. From these measurements we could calculate for the different materials the difference in absorbance between the cured and the non-cured material. Depending on the material the absorbance of the non-cured material was a factor 20 to 60 higher compared to the absorbance of the cured material. These results were used as input for the optical model. In a next step we measured the BTDF for the different materials and calculated the scatter angle at 1/e2. As a result we obtained scatter angles between 2° and 6°. In a last step we verified and confirmed these differences in scatter behavior by measuring the MTF of a real imaging system that included the photopolymer.

Paper Details

Date Published: 9 May 2012
PDF: 10 pages
Proc. SPIE 8439, Optical Sensing and Detection II, 84391Z (9 May 2012); doi: 10.1117/12.921807
Show Author Affiliations
Wendy Meulebroeck, Vrije Univ. Brussel (Belgium)
Youri Meuret, Vrije Univ. Brussel (Belgium)
Stefaan Heyvaert, Vrije Univ. Brussel (Belgium)
Hugo Thienpont, Vrije Univ. Brussel (Belgium)

Published in SPIE Proceedings Vol. 8439:
Optical Sensing and Detection II
Francis Berghmans; Anna Grazia Mignani; Piet De Moor, Editor(s)

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