Diffractive element in optical inspection of paper
- 1 May 1998
- journal article
- Published by SPIE-Intl Soc Optical Eng in Optical Engineering
- Vol. 37 (5) , 1482
- https://doi.org/10.1117/1.601664
Abstract
A computer-generated diffractive optical element to produce 4×4 spot matrix images was fabricated by electron-beam lithography. The element was applied to the inspection of paper sheets. Images of spot matrices were analyzed, and agreement between the reflectance measured by the present sensor and a spectrophotometer was observed. The sensor image was able to yield information about local curvature as well as defects. Moreover, sensor images from surfaces of different paper samples revealed material surface anisotropy in the cross-correlation analysis of image data. © 1998 Society of Photo-Optical Instrumentation Engineers.Keywords
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