| 摘要 |
PURPOSE:To project invariably constant UV light by composing a measuring instrument main body of a light guide part which guides collected UV light to perpendicularly right above, a dimming part which transmits only the ultraviolet-ray wavelength component of the guide UV light, and a photodetection part. CONSTITUTION:When the measuring instrument main body 4 is put in a UV furnace 1, the UV light enters the main body 4 from a light collection window 10 and is guided to right perpendicularly above by a prism 6. Further, only UV light which is a constant wavelength component in the ultraviolet-ray is guided to a photodiode 9 constituting a photosensor through a heat-ray absorption filter 7 and a ultraviolet-ray transmission interference filter 8. The electric signal obtained by the photoelectric conversion of this diode 9 is sent out to a signal processor 5 and read out by performing, for exam ple, amplification processing to measure the illuminance of ultraviolet rays quantitative ly in a ultraviolet-ray setting resin coating process in the manufacture running of an optical fiber. Further, the main body 4 is cooled with cooling gas admitted from an opening part provided to a support part 11. |
