Particle analyzer and blood cell counter

摘要

PURPOSE:To obtain exact volumetric distribution data by including fine particles into an electrolyte, passing the electrolyte in a fine hole and detecting a change in the electric impedance between electrodes when the particles pass the fine hole. CONSTITUTION:A flow cell 1 has the form of a long box body formed of a transparent wall member and is formed with the transparent wall part 1a therein. A recessed part is formed atop this part. An inlet part of the fine hole 2 is formed at the peak part of the recessed part. A particle sample which is a measuring object is injected from a nozzle 3. This particle sample is enclosed in a back sheath liquid injected from a sheath liquid injection port 5 and is discharged from a discharge port 6 to the outside. The electrodes 7, 8 are disposed above and below the cell 1. The electric impedance of the electrodes 7, 8 changes when the sheath liquid which is the electrolyte passes the fine hole 2. The light by the particles is detected at this time and the change rate of the above-mentioned electric impedance is read only when the light is identified as the passage of the single particle. The information on the volume of the particle sample past the fine hole 2 is then obtd. and the exact volumetric distribution data is obtd.