| 摘要 |
PURPOSE:To enable in-line measurement even in multicomponent mixed liquid by irradiating sample liquid with exciting light, further irradiating sample with exciting light having wavelength absorbed by the object material of measurement in an excited state, and measuring the quantity of the absorption of the exciting light. CONSTITUTION:The exciting light 21 from a pulse laser light source 1 shoe pulse intervals are controlled 7 is branched 9, and one is guided to a light source intensity detector 5 and the other is guided to a sample cell 3 to project on the sample 11. The exciting light 22 from a CW laser light source 2 is also guided to a light source intensity detector 6 and the sample 11 similarly. Then materials which do not transit an excited state from a base state with the exciting light 21 are excluded from a detection range, and materials which do not transit the excited state of further upper level with the exciting light 22 are also excluded from the detection range. Consequently, the concentration of a desired object material can be measured. Further, when there is a coexistent material which can not separated, variation in the absorption of the exciting light 22 with lapse of time is measured to find the light absorption quantity in a time area wherein the influence of the coexistent material is little, and the absorption intensity based upon only the contribution of the material to be measured is measured to determine the concentration of the object material.
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