| 摘要 |
<P>PROBLEM TO BE SOLVED: To practically and accurately measure spectral characteristics, such as a total spectral emissivity coefficient, of a fluorescent whitening sample under ambient light without using an expensive measurement instrument. <P>SOLUTION: In a weight coefficient setting phase, a non-fluorescent reference sample and a fluorescent reference sample are illuminated by ambient light 4 to acquire spectral distributions Ewe and Ere of light emitted from both samples, and a reference total spectral emissivity coefficient Bre(λ) of the fluorescent reference sample 3 is obtained. The fluorescent reference sample is sequentially illuminated by first and second illuminating light beams to acquire first and second spectral distributions Er1 and Er2, and first and second total spectral emissivity coefficients Br1 and Br2 are obtained. A weight coefficient W(λ) is obtained so as to satisfy Bre(λ)=W(λ)×(Br1(λ)+(1-W(λ)))×Br2(λ). In a measurement phase, a measurement sample 1 is sequentially illuminated by first and second illuminating light beams to obtain first and second total spectral emissivity coefficients Bx1(λ) and Bx2(λ), and a resultant total spectral emissivity coefficient Bc(λ) is obtained in accordance with Bc(λ)=W(λ)×(Bx1(λ)+(1-W(λ)))×Bx2(λ). <P>COPYRIGHT: (C)2012,JPO&INPIT |
