Linearly polarized light-based polarization tracking system and method

The invention discloses a linearly polarized light-based polarization real-time tracking method, which relate to a polarization tracking system and a polarization tracking method. The invention solves the poor real-time tracking problem of the conventional polarization tracking method. In the system, a polarization analyzer is fixed on an output shaft of a step motor, a detection face of a charge coupled device (CCD) detector acquires incident light transmitted in the polarization analyzer and outputs an image to the computer through an image acquisition card, and the control signal output end of the computer is connected with the control signal input end of the step motor. In the method, the detection face of the CCD detector detects the incident light and generates an image, the image acquisition card detects the gray scale of the image, the computer calculates according to a detected value to obtain the polarization direction change information of the incident light and drive the step motor to drive the polarization analyzer to rotate to a direction consistent with the polarization direction of incident light, and thus, the polarization tracking of the incident light is realized. The system and the method are applicable to the polarization tracking of linearly polarized light.