PARTICLE MEASUREMENT APPARATUS AND PARTICLE MEASUREMENT METHOD

摘要

PROBLEM TO BE SOLVED: To provide a particle measurement apparatus and a particle measurement method capable of precisely measuring changes in impedance by detecting and reducing fluctuation in measured impedance values due to circuit drift.SOLUTION: The particle measurement apparatus includes: two pairs of electrodes which are immersed in a liquid including particles introduced in a cell; an electrophoretic power supply unit that applies an AC voltage across the electrodes; impedance measurement means that measures the impedance across the electrodes; and a calculation section that calculates the number of particles in the liquid from the measurement result by the impedance measurement means. The electrophoretic power supply unit applies the dielectrophoresis power to one electrode in the two pairs of electrodes. The impedance measurement means measures the impedance across the two pair of electrodes. The calculation section calculates concentration of the particles based on calculation result of the difference between the changes of the impedance on one electrode and the impedance on the other electrode.