| 摘要 |
PURPOSE:To reduce the cost of a device, and to remove restrictions of an optical system and reduce an error by rotating or moving a half-mirror which has a small hole. CONSTITUTION:Luminous flux from a light source 2 or 4 is made into homogene ous light through the diffraction grating 16 of a spectroscope part 10 and the light is incident on a beam splitter 24 through reflecting mirrors 18, 20, and 22. The splitter 24 is composed of the half-mirror formed by boring numbers of small holes in a mirror or by forming a film with numbers on small holes on a base material which is transparent to ultravoilet visible light, and the splitter is rotated by a motor 26. Namely, an image of the small holes moves on a sample and detectors 42 and 44, so substantially no image of the small holes is formed. The incident light is split by the splitter 24 continuously into sample light 28 and reference light 30, which are incident on the detectors 42 and 44 through the sample cell 38 and reference cell 40 in a sample chamber 36 and detected respectively, so that a measuring circuit calculates the transmissivity or absorbance of the sample. |
