Particle size distribution measuring device

A particle size distribution measuring method that irradiates an inspection light on a dispersed particle group and that calculates a particle size distribution of the particle group based on a characteristic of a secondary light (hereinafter called as a real secondary light characteristic) produced when the inspection light is irradiated on the particle group, wherein

• using an iterative solver that updates several times an imaginary solution in order to make a characteristic of an imaginary secondary light (hereinafter called as an imaginary secondary light characteristic) calculated based on the imaginary solution of the particle size distribution approach the real secondary light characteristic and that calculates the obtained imaginary solution as the particle size distribution,
• and is characterized by repeating more than once a process that updates the particle size distribution calculated by the use of one iterative solver with a new particle size distribution calculated by giving the calculated particle size distribution to the other iterative solver as the imaginary solution.

A memory media that stores a program loaded on a particle size distribution device comprising a light source that irradiates an inspection light on a dispersed particle group, multiple light receiving part that receive a secondary light produced when the inspection light is irradiated on the particle group and an arithmetic circuit that calculates a particle size distribution of the particle group based on a characteristic of the secondary light (hereinafter called as a real secondary light characteristic) obtained from an output signal of each of the light receiving parts, wherein

• the arithmetic circuit produces
• a function of executing an iterative solver that updates more than once an imaginary solution in order to make a characteristic of an imaginary secondary light (hereinafter called as an imaginary secondary light characteristic) calculated based on the imaginary solution of the particle size distribution approach the real secondary light characteristic and that calculates the obtained imaginary solution as the particle size distribution, and
• a function of repeating more than once a process of updating the particle size distribution calculated by means of one iterative solver with a new particle size distribution calculated by giving the calculated particle size distribution to the other iterative solver as the imaginary solution.