CALIBRATING DEVICE

PROBLEM TO BE SOLVED: To provide a calibrating device capable of precisely calibrating an optical measuring device for measuring a particle size distribution. SOLUTION: The calibrating device is equipped with a plurality of transparent base materials each of which has an antireflection film provided to at least one of both surfaces, standard particles having a refractive index different from that of the transparent base materials and transmittance almost coinciding with that of a measuring target and fixed to at least one of both surfaces of each of the transparent base materials and the spacers alternately stacked to the transparent base materials and almost vertically holding both surfaces of each of the transparent base materials with respect to an optical axis. In the stacked transparent base materials, the distance between both end parts on an incident side and an emitting side is allowed to almost coincide with the light path length of the measuring target and one surfaces having the standard particles fixed thereto of the transparent base materials and the cross section of the measuring target corresponding to the same position are allowed to almost coincide with each other in particle size distribution, number per a unit area and average particle interval. Further, in the stacking direction, the distance between the surfaces, to which the adjacent standard particles are respectively fixed, of the transparent base materials almost coincides with the average particle interval at the position corresponding to the measuring target. COPYRIGHT: (C)2010,JPO&INPIT