Patent ID: 8598863

Claim:
An apparatus for detecting motion characteristics of particles in a flow channel through which a fluid containing the particles flows, comprising: first and second electrode groups, each electrode group comprising a pair of electrodes functioning as both a drive electrode and a sensing electrode for directly applying voltage and measuring impedance between the pair of electrodes; and, an operation control unit for measuring variation in electrical pulses generated in the first and second electrode groups as the particles pass through the flow channel, thus detecting the motion characteristics of the particles, wherein the first electrode group and the second electrode group are sequentially arranged in a longitudinal direction X of the flow channel with both of the first and second electrode groups being positioned on the same surface plane of the flow channel, one electrode of the first electrode group is inclined at a first angle to the other electrode so that a distance l 1 (P) by which the electrodes of the first electrode group are spaced apart from each other in the longitudinal direction is increased in a specific transverse direction Y of the flow channel, while one electrode of the second group is inclined at a second angle to the other electrode so that a distance l 2 (P) by which the electrodes of the second group are spaced apart from each other in the longitudinal direction is decreased in the specific transverse direction of the flow channel.