LASER DIFFRACTION/SCATTERING TYPE PARTICLE SIZE DISTRIBUTION MEASURING INSTRUMENT

摘要

PROBLEM TO BE SOLVED: To provide a laser diffraction/scattering type particle size distribution measuring instrument capable of obtaining an accurate measurement result of particle size distribution all the time, without condensing dew on a surface of a sample cell, even when a low temperature of medium liquid is used for the measurement.;SOLUTION: In this laser diffraction/scattering type particle size distribution measuring instrument, a spatial intensity distribution of diffracted/scattered light generated by irradiation of a laser beam is measured in a particle group which is to be measured and dispersed in the medium liquid in the sample cell 3 arranged inside a measuring space 12 surrounded by wall bodies 1a, 1b, and a particle distribution of the particle group to be measured is found based on a measured data. The particle size distribution measuring instrument is provided with gas introduction means 6, 7 for introducing a high purity of inert gas into the measuring space 12, and an exhaust means 9 for discharging a gas in the measuring space 12; the atmosphere in the measuring space 12 is thereby replaced with the purity of inert gas; the dew condensation on the surface of the sample cell 3 is thereby prevented being generated, even when using the low temperature of medium liquid; and multiple scattering or the like caused by the dew condensation is prevented from being generated to obtain the accurate measurement result of particle size distribution all the time.;COPYRIGHT: (C)2008,JPO&INPIT