Microfluidic chip optical positioning code disc, device and method

The invention discloses a microfluidic chip optical positioning code disc, device and method. The cross section of the outer contour of the code disc is circular, N light-transmitting openings are uniformly formed in the periphery of the code disc, and the length of the first light-transmitting opening is larger than that of the second to N light-transmitting openings. The device comprises the code disc, a positioning pin, a rotating shaft, a motor, an internal photoelectric switch and an external photoelectric switch, wherein a positioning surface is arranged on the rotating shaft; the motoris fixedly connected with one end of the rotating shaft; the other end of the rotating shaft penetrates through the center of the cross section of the code disc, and when the code disc is used, the positioning pin is arranged at a positioning notch of a microfluidic chip to be matched with the positioning surface for positioning; and the internal photoelectric switch and the external photoelectricswitch are used for ident