Cross Laser Stripe Center Extraction Based on Gray Center of Gravity Method

In the photoelectric self-collimating three-dimensional angle measurement system, the extraction of the center point of the reflected light is a prerequisite for accurate angle measurement. Using cross laser instead of traditional point laser and extracting the center of cross laser stripe is an effective way to improve the accuracy of center point measurement. To address this problem, this paper proposes a method for extracting the center of cross laser stripes based on the gray center of gravity method. Firstly, the working principle of the photoelectric self-collimating three-dimensional angle measurement system is analyzed, and the mathematical relationship between the rotation angle of the mirror and the movement of the center point of the reflected light is determined. Then, the basic principle of applying the gray center of gravity method to obtain the center of the cross stripe is introduced. Finally, the stability of this paper's method under different cross laser cases is verified by experiments, and the accuracy of this paper's method under scattered light interference conditions is verified by comparison with other commonly used methods.