| 摘要 |
PROBLEM TO BE SOLVED: To measure a large-sized sample in a horizontally placed state. SOLUTION: Luminous flux S on a sample side is incident on the undersurface of a sample 21, in an almost vertical direction and the light transmitted through the sample upwardly is refracted by a reflecting mirror M1 to be sent to an integrating sphere 24 equipped with a detector. A luminous flux R on the reference side incident, in parallel with the luminous flux S on the sample side, is refracted by reflecting mirrors M2-M4 so as to bypass the sample 21 to be introduced into the integrating sphere 24. Accordingly, it is unnecessary to prepare a holder matched with the sample 21 in size or shape, and a measuring position can be freely changed by shifting the position of the sample. When a conventional standard sample chamber 11 is utilized, movable reflecting mirrors 22, 23 are inserted in a optical path and luminous flux advancing on a horizontal surface in parallel by reflectingt mirrors M5-M7 may be used.
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