| 摘要 |
PURPOSE:To make it possible to measure the concns. of various colored specimens in high sensitivity, by using emitted rays having two wavelength regions within a wavelength of 400-800nm and a detection apparatus having sensitivity characteristics with respect to rays in said two wavelength regions. CONSTITUTION:Light of continuous spectrum emitted from a halogen lamp or a tungsten lamp 13 is condensed by a condensing lens 12 and light in the part of a middle wavelength region is absorbed by a filter 11 having optical characteristics, for example, shown by the drawing (a) to be divided into lights having two wavelength regions shown by the drawing (c). The colored specimen, for example, CrO<2->4 in a cell 20 has absorbability shown by the drawing (d) and, when the light shown by the drawing (b) is transmitted through the cell 20, it is converted to light shown by the drawing (d). On the other hand, a semiconductive photoelectric element having sensitivity characteristics to two wavelength regions, for example, a color sensor has two light receiving parts and, because light receiving parts PD1 and PD2 respectively have sensitivity characteristics shown by the drawing (e), the relative output of the semiconductive photoelectric element comes to one shown by the drawing (f). By this method, the concn. of various colored specimens can be measured in good reproducibility and high sensitivity. |
