| 摘要 |
PURPOSE:To reduce the power consumption of a light source and the size of an instrument by intermittently lighting the light source and correcting a deterioration in the stability of the light source due to intermittent lighting. CONSTITUTION:A light source 2 is repeatedly lighted at a prescribed period and controlled such that a lighting period is shorter than an unlit period. Aside from specimen light flux 6 formed by light from the light source 2 passing a specimen measuring position, a light path for monitor light flux 14 is provided and, as detectors, a specimen light flux detector 22 and a monitor light flux detector 24 are provided. A signal processor 30 takes in detection outputs on the sides of the specimen light flux and the monitor light flux for the same period in synchronism with a period for which the light source 2 is lighted, the ratio of the detection output on the former side to that on the latter side is calculated with the detection output on the latter side as a reference and change in the light amount of the light source 2 is corrected.
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