Paul Gregory Harris,George Robert Fern,Jack Silver
申请号：
GB20170006291
公开号：
GB2561597(A)
申请日:
2017.04.20
申请国别(地区):
英国
年份:
2018
代理人:
摘要：
The composition of articles can be identified using luminescent codes printed or coated onto the articles (or labels on the articles) by means of an ink which contains long persistence luminescent materials. A first type of electromagnetic radiation is used to excite the luminescent materials and store luminescence in the label. This is then extinguished by waiting for a period of time such as 1ms to 5s. A second type of electromagnetic radiation such as an infrared beam is then applied to the article in order to release the stored luminescence and stimulate emission from the long persistence luminescent materials, via a detrapping mechanism, and a detector such as a spectrometer detects the emission in order to identify the article. The wavelengths of the first and second types of electromagnetic radiation may be from 200nm to 700nm and from 700nm to 3000nm respectively. The radiation may be applied by scanning or by moving the articles on a conveyor through a static field. The method may be used in the sort
