| 摘要 |
PROBLEM TO BE SOLVED: To make transmittance of a measured solution easily measurable by inversely computing three stimulus values of complementary color from the complementary color obtained from chromaticity, and multiplying the further computed spectral distribution of the complementary color by spectral distribution outputted from a sensor to electrically obtain the complementary color. SOLUTION: Spectral distribution Tn (λ) of light transmitted through a sample is outputted from a spectral sensor and inputted to a microcomputer, and three stimulus values X, Y, Z obtained by multiplying Tn (λ) by an isochromatic function by a three- stimulus value XYZ computing element 61 of the microcomputer are inputted to a chromaticity computing element 62. A complementary color computing element 63 computes complementary color from the chromaticity of output Cn of the computing element 62, and a chromaticity→spectral distribution computing element 64 inversely computes three stimulus values X, Y, Z of complementary color from the output Cn. Spectral direction (λ) of complementary color obtained by dividing X, Y, Z by an isochromatic function is outputted and inputted to a multiplier 65. The multiplier also inputs the spectral distribution value Tn (λ) from the spectral sensor and obtains transmittance Th (λ) to the complementary color by Tn (λ)×H (λ). A mechanical filter equivalent to the complementary color is therefore dispensed with, and operation for selecting this is also dispensed with.
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