New method for measuring an optical property of a sample treated by FWA

✍ Scribed by Kenji Imura

• Publisher: John Wiley and Sons
• Year: 2007
• Tongue: English
• Weight: 167 KB
• Volume: 32
• Category: Article
• ISSN: 0361-2317
• DOI: 10.1002/col.20307

✦ Synopsis

Abstract

In this article, a new method for measuring a total spectral radiance factor of a FWA‐treated sample illuminated by a specific standard illuminant is introduced. The method replaces an unstable real fluorescent standard by a bi‐spectral luminescent radiance factor data, which works as a virtual fluorescent standard (VFS) by knowing spectral intensity distributions of illuminations applied to the sample. The method utilizes two illuminations I~1~ and I~2~ whose relative spectral intensity distributions are different from each other and synthesizes a virtual illumination presenting the identical fluorescent spectral radiance factor to that presented by the standard illuminant with the VFS of the specific bi‐spectral luminescent radiance factor by linearly combining I~1~ and I~2~ with the suitable weighting factors. The applicability of the method is examined in principle by comparing ISO brightness and CIE whiteness index of fluorescent standard paper as a test sample obtained by this new method to the assigned values. © 2007 Wiley Periodicals, Inc. Col Res Appl, 32, 195–200, 2007