| 摘要 |
PURPOSE:To make highly accurate measurement possible by the constitution consisting of providing a reflecting surface of a conical shape making total reflection within an integrating sphere, and permitting measurement of one wavelength region of the luminous flux taken into a plurality of optical fibers with each of the fiber bundles. CONSTITUTION:A quartz dome 1 uniformly taken in the light from 180 deg. of all sky. In an integrating sphere 2, light enters directly from an opening part 3 or enters after reflecting on a conical reflecting surface 4. Light guides 6, 6', 6'' are constituted of optical fibers corresponding to respective wavelengths, and the energy of each wavelength band is divided by interference filters 7, 7', 7''. Detectors 8, 8', 8'' corresponding to the respective wavelengths are provided. The inside of the sphere 2 is constituted of a diffusing surface so that the sunshine from all the directions of 180 deg. can be taken in through the opening part 3, thereby allowing much of luminous flux to enter. |
