METHOD OF DISCRIMINATING PAPER QUALITY

摘要

PROBLEM TO BE SOLVED: To provide a paper money discriminating method for discriminating a paper quality without depending on a shade pattern generated by a difference in a manufacturing process, and discriminating the paper quality of a paper sheet without being influenced by humidity and the deterioration of the paper quality. SOLUTION: The light is measured by using two kinds of light having a wave length of 800 nm to 2,200 nm, and the paper quality of the paper sheet is discriminated by using an absorbance difference in a light measured value.