PROBLEM TO BE SOLVED: To provide a double beam spectrophotometer capable of measuring large-scale samples in a horizontally-installed situation.;SOLUTION: The sample-side light flux S is incident in a nearly vertical direction to the undersurface of sample 21, while the light transmitted upward is inflected with a reflecting mirror M to send to an integrating sphere 24 equipped with a detector. The control-side light flux R incident in parallel to the sample-side light flux S is inflected with reflecting mirrors M2 to M4 so as to bypass the sample 21 to be introduced to the integrating sphere 24. The measuring position is, therefore, freely changeable by shifting the sample position, without necessity to prepare holders fitted with magnitude and geometry of the sample 21. Moreover, when the conventional standard sample room 11 is utilized, by inserting adjustable reflecting mirrors 22 and 23 into a light path, the light flux may be obtained to propagate parallelly over horizontal plane by the use of the reflecting mirrors M5 to M7.;COPYRIGHT: (C)2007,JPO&INPIT
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