Patent ID: 6469786
Filing Date: 2002-10-22
Classification: G01N

Abstract:
A particle size analyzer, comprising:an irradiation optical system for irradiating parallel laser beam to particles to be measured in a dispersion state; a measuring optical system for measuring a spatial intensity distribution of scattered light generated by irradiation of the laser beam, said measuring optical system including a condenser lens for condensing the scattered light scattered over a wide angle area, and an optical sensor for continuously detecting an intensity distribution of lights entering a detecting surface thereof positioned at a focal point of the condenser lens; and a calculation device for calculating a particle size distribution of the particles to be measured by using the spatial intensity distribution of the scattered light by the optical sensor, said calculation device having correction means for carrying out a correction operation of measuring an error of the scattered light intensity distribution caused by an aberration by the condenser lens and an attenuation in an optical path by comparing data obtained and stored in advance through a ray tracing of the measuring optical system with a value obtained at the optical sensor, said calculation device calculating the particle size distribution after the correction operations.