| 摘要 |
PURPOSE: To measure a concentration of absorbed material uniformly distributed in carrier substance even when a layer thickness is unknown by determining the concentration based on relation of the concentration introduced from each calibration measurement and a fiction component density. CONSTITUTION: When a layer thickness (d) of carrier substance is unknown, absorbed material of which actually measured absorption values a (λ) are deflected from a Lambert-Beer's law in a relatively high density range is used. It is supposed that a (λ)=[ε1 (λ).c1 +ε2 (λ)/c2 +...+εn .(λ).cn ]d is satisfied for each fiction component of n>=2 in the absorbed material, the absorption value (a) (λi) is measured for at least n-wavelengths, and each spectral absorption valueεi (λi ) and density ci for each fiction component are computed. The concentration (c) is determined by a functional relation expression c=f(ci ) between the concentration (c) introduced from each calibration measurement and the concentration ci of the component.
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