| 摘要 |
PURPOSE:To eliminate a visual field optical path dedicated to the viewing of light to be measured and to measure optical characteristics of a body to be measured by constituting an optical wave guide so that a photodetector attachment and a finder attachment are fixed in a replaceable state where the light to be measured is photodetected. CONSTITUTION:The finder attachment 15 is mounted on the optical waveguide 10 and the photodetection direction of a photometric instrument is so adjusted through a viewer 19 so that the light to be measured is aligned with the center of its cross. Namely, the light to be measured which is incident from an incidence window 11 is transmitted through the objective 13 of the optical waveguide 10, a projection window 12, the opening 18 of the attachment 15, and an ocular 20 to form an image in the view window 19. Then the attachment 15 is replaced with the photodetector attachment 14 and then the optical axes of the attachments 14 and 15 are aligned with each other, so that the desired light to be measured which is sighted in the view window 19 is made incident precisely on a detector 17 incorporated in the attachment 14. Namely, the light to be measured which is incident from the incidence window 11 is transmitted through the objective 13 of the optical waveguide 10, a projection window 12, and small hole of the attachment 14 and then made incident on the detector 17. Thus, desired optical characteristics are measured without splitting the light to be measured. |
