Laser Reflection Characteristics Calculation and Detection Ability Analysis of Active Laser Detection Screen Instrument

Abstract

The traditional sky screen has been mainly used to detect the projectile’s information, but it mainly uses the detection environment with natural light as the background. As natural environmental illumination changes with the time of a day, the environmental illumination can significantly change. When the environmental illumination is lower than 1500 lx, the detection ability of the traditional sky screen is extremely low, and accurate detection cannot be achieved. To solve this problem, this article proposes a method of using a high-power near-infrared line laser to form a laser detection plane as a background light source, considering that the line laser divergent plane coincides with the detection screen plane to realize the near-infrared laser detection screen and presents the parameter design and calculation analysis of the receiving optical path. The proposed method considers the geometric structure of the near-infrared laser detection screen and the spatial position of a projectile. A laser reflection characteristics’ calculation model is constructed using bidirectional reflection distribution function (BRDF), and the calculation function of the total spectral irradiance of the projectile’s reflection laser is derived. By combining the optical and structural parameters and the spectral irradiance of the projectile reflection laser, the theoretical calculation function of the detection ability is derived based on the number of electrons that come from the projectile’s surface reflection laser. The experimental verification shows that the designed active laser detection screen instrument can solve the problem of detection and testing of a projectile’s parameter under the condition of low environmental illumination.