To solve the problem that it has been difficult to stir and mix fluid effectively and rapidly in a micro fluid device in a simple channel structure, that there has been no means for holding a particulate sample floating in the fluid in a channel for a long time without any settlement, and further that there has been no method for measuring the true size of the floating and flowing particulate sample with a microscope conventionally.
The micro fluid device is used, where a pair of electrodes having a wide gap width is formed in a channel or a chamber, and an AC voltage is applied to the pair of electrodes to generate swirls where fluid turns in a torus shape. Especially, setting a focusing point surface 53 of an objective lens 52 in the microscope to a position where a turning flow 41 passes vertically enables the measurement of the accurate size of a particulate sample crossing the focusing point surface.
TANI KENTARO
MINAMITANI HARUYUKI
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