SPECTROMETRIC MEASURING INSTRUMENT

PROBLEM TO BE SOLVED: To provide a spectrometric measuring instrument allowing double beam measurement by a simple mechanism. SOLUTION: This double beam type spectrometric measuring instrument 10 capable of dividing a light beam from a light irradiation means 12 to irradiate a measuring sample 26 and a reference sample 28 alternately with the light beam is provided with a double opening means 14 provided with an opening part 16a for a measuring sample irradiation side and an opening part 16b for a reference sample irradiation side, and a shutter 18 for opening and closing the two openings. In the spectrometric measuring instrument, the one beam from the light irradiation means is emitted to the double opening means, the beam is passed through the respective opening parts to be brought into the beam for measuring sample irradiation and the beam for reference sample irradiation, and the opening part for the measuring sample irradiation side and the opening part for the reference sample irradiation side are switched for opening/closing by the shutter means, so as to conduct switching between the beam irradiation to the measuring sample and the beam irradiation to the reference sample. COPYRIGHT: (C)2005,JPO&NCIPI