Document sorting system for sorting documents suitable for recirculation, in particular bank notes

摘要

A document sorting system according to the invention comprises a light source provided with an optical system for focusing the light from the light source onto a document, and a detection unit which consists of a first detector device for detecting the light diffusely reflected by the document, and of a second detector device for detecting the transmission through the document. The system further comprises an evaluation device for determining the suitability of the document on the basis of the measured diffuse reflection and transmission. The detection unit is further also provided with a third detector device for detecting the specularly reflected light, the detection result of which is likewise fed to the evaluation device.