Multi-band Detectors Module and Its Application to Currency Note Sorter

Abstract

This paper is concerned with multi-band detectors module, a kind of color measuring equipment, and its application to industrial automated visual inspection.
For automated visual inspection which deals with color, high speed measurment of an object color with a high accuracy is important.
Multi-band detectors module consists of mirror box and some detectors which have different spectral sensitivities, and is suitable for measurment of average color in relatively wide area of an object to be inspected. Using this module, efficiency of detecting signal light is more than one hundred times better that other method such as using dichroic-mirror.
In this paper, firstly, efficiency of detecting signal light and uniformity of illuminance on detectors surface are theoretically analyzed. Secondly, designing method for multi-band detector is discussed. Finally, an application of the module to currency note sorter is described.