| 摘要 |
PROBLEM TO BE SOLVED: To obtain an integrating sphere exhibiting excellent measurement accuracy in far ultraviolet and vacuum ultraviolet regions by providing a phosphor coating containing a phosphor on the inner surface of a hollow sphere having a light incident window and a light receiving window. SOLUTION: A sample light 12 passes through the incident window 8 of an integrating sphere 7 and irradiates a phosphor coating 10 containing a phosphor provided on the inner surface of a hollow sphere 14. A fluorescent light beam 22 emitted by irradiating the sample light 12 passes through a light receiving window 9 while being diffuse reflected on the surface of the phosphor coating 10 provided entirely on the inner surface of the integrating sphere 7 and reaches a detector 13 comprising a phototube where it is used for measurement. On the other hand, a reference light introduced from the reflector of a spectroscopic measuring apparatus passes through another incident window from an angle shifted by 90 deg. from the incident window 8 and irradiates the phosphor coating 10 on the inner surface of the integrating sphere 7. At the same time, an emitted fluorescent light beam reaches the detector 13 while being diffuse reflected on the surface of the phosphor coating 10 and used for measurement.
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