Theoretic analysis and experimental study on optical characteristics of extended targets

Based on the target reflection section defined by the bidirectional reflectance distribution function, a method of approximate calculation and analysis of the cones and plates reflection section in laser-illuminated condition put forward. With the method, the reflection section of cone was calculated and analyzed. An experimental platform was established with Nd:YAG laser and CMOS camera, through which the experimental research is carried out on the target characteristics under the condition of laser lighting. The experimental result of the reflection section and its theoretically calculated result were in agreement with each other. The results show that, among different targets of the same shape with no paint, white paint and gray paint layer, if the incidence angle is less than 45, the reflection section gradually decreases, otherwise, the reflection cross section of the target with white paint layer is greater than others. Among plate, cylinder and cone shaped targets with the same paint layer, the reflection cross section diminishes by turns.