A High Speed Test and Analysis Method for Information Field Parameters of Beam Riding Guidance

Laser beam riding guidance is an important guidance mode. The accuracy of guidance is affected directly by the quality of laser information field. A testing method based on the spot images of information field is proposed to evaluate the quality of laser information field fastly and intuitively. The proposed method allows the fast setup of a test system in inside and outside fields, and calibrates the system. Based on the principle of transient diffuse reflectance imaging under low illumination, the stripe-shaped spot images are quickly obtained by using low-light-high-speed imaging of laser beam. The rapid image processing technology is used to calculate the spot size, center location, stripe brightness for evaluating the parameters, including optical axis stability and energy uniformity of information field. Experimental results show that the test method can be used to obtain the stripe-shaped spot images of laser information field, and detect the performance of the guidance device rapidly with test accuracy of 1.8 mm and processing time of 0.35 s.