System of automatic adjustment of laser reflection path

A system of automatic adjustment of a laser reflection path, comprising a central processing device, a driving device, a four-quadrant photodetector, a driving arm, a micro cantilever, a sample placing table, a light reflector, a laser, a charge-coupled device (“CCD”) equipped with an optical microscope, and a control device;

• wherein, the CCD equipped with the optical microscope is disposed right above the sample placing table, a sample is placed on the sample placing table, a laser emission terminal of the laser has the light reflector arranged in front of the same, the four-quadrant photodetector and the laser are arranged on a same horizontal plane, the driving device drives the driving arm, the micro cantilever is positioned below the driving arm, the CCD equipped with the optical microscope is bidirectionally connected with the central processing device, an input terminal of the laser and an input terminal of the driving device are both connected with an output terminal of the central processing device, an output terminal of the four-quadrant photodetector is connected with an input terminal of the central processing device, and an output terminal of the control device is connected with an input terminal of the central processing device;
• wherein, a user inputs a magnification value of the CCD equipped with the optical microscope via the control device, the control device transmits the magnification value of the CCD equipped with the optical microscope input by the user to the central processing device which then transmits a received magnification value of the CCD equipped with the optical microscope to the CCD equipped with the optical microscope, the CCD equipped with the optical microscope adjusts its magnification to the received magnification accordingly, the user controls the central processing device via the control device to enable the laser to emit laser beams which pass through the light reflector and are reflected onto the micro cantilever, the CCD equipped with the optical microscope receives image information on the micro cantilever, and transmits the collected image information to the central processing device;
• the central processing device processes the received image information to identify the micro cantilever, obtains a relationship between a driving arm displacement distance and a pixel position variation in the CCD image, and controls the driving device to drive the driving arm to move the micro cantilever to a central position of a laser beam spot reflected by the light reflector.