CALIBRATION INSTRUMENT FOR MEASURING INSTRUMENT OF LIGHT SCATTERED PARTICLE DIAMETER DISTRIBUTION AND CONCENTRATION

摘要

PURPOSE:To calibrate a measuring instrument extremely easily with high accuracy by using a calibration instrument constituted by arranging many circular or opaque disks which have a diameter =20 times the wavelength of light at random. CONSTITUTION:The calibration instrument is formed by forming at random circular holes 7 which have a diameter =20 times the wavelength of light in a opaque flat plate 6 or arranging multiple opaque disks 9 having said diameter on a transparent flat plate 8. Plural calibration instruments which differ in the diameter and number of the circular holes 7 or disks 9 are put in a particle group 3 and an intensity distribution obtained on a focal plane 2 is analyzed to find a parameter X1 of a concentration calibration line. Then a proportional coefficient K is determined from the relation between 4/3pia3N and X1, where N is the number of the circular holes 7 and (a) is their diameter. Consequently, the proportional coefficient K can be determined by a measurement optical system itself and the measuring instrument is calibrated extremely easily with high accuracy.