DETERMINATION OF PHOSPHOR CONCENTRATION OF PHOSPHOR SEGREGATED PART

摘要

PURPOSE:To enable determination of phosphor concentration of a phosphor segregated part of a sample to be inspected, by comparing a sample being inspected treated on the same testing conditions with an image processing information of a reference sample for detecting and testing phosphor segregated part. CONSTITUTION:A print sheet of a reference sample is converted to an electrical signal with an image pick up tube or the like and then into a digital signal with an A/D converter to be preserved into a memory by phosphor concentrations. On the other hand, a print sheet of a sample to be inspected is likewise converted to an electrical signal and then to a digital signal with an A/D converter and compared the resulting digital signal is with the digital signal of the reference sample previously preserved into a memory by a comparator. The results are shown on a display unit. The comparison method herein used is preferably that, first, a calibration curve of the phosphor concentration of the reference sample digitally converted is prepared and the calibration curve thus obtained is used for the sample being inspected as follows: The digital signal of the sample being inspected is compared with a digital signal corresponding to the phosphor concentration in the calibration to determine the concentration of phosphor of the sample being inspected. This enables a quick and highly accurate determination of phosphor concentration.