Mechanism Research On The Effect Of Laser Active Detection

Laser active detection technology is widely used in the field of military guidance,detection and positioning,target stealth and other technical fields.Accurate study of the mechanism of laser active detection is not only conducive to improve the detection ability of the detection system,but also enable our photoelectric instrument to be stealthy in complex and changeable detection environment.The principle of the cat eye effect,the principle of the laser active detection and the influence of the atmosphere on the laser transmission are introduced and analyzed in this paper.From the cat eye effect mechanism,the cat eye system defocus model was established to analyze the effect of the defocus amount on the echo parameters of the cat eye system.The color difference model of cat's eye system was set up to analyze the influence of laser wavelength on the echo parameters of cat eye system.The problem of chromatic aberration matching is converted to the problem of defocus.The echo energy model is established to analyze the influence of the parameters of the cat eye system and the detection distance on the echo power.The probability model of active laser detection is established,and the influence of the parameters of the cat's eye system on the detection probability and the detection distance on the detection probability are analyzed.The FRED defocus simulation experiment is done to the single gun sights,and the distribution of the echo illumination of the different degree of defocusing of the gun aiming system is obtained.The FRED chromatic aberration simulation experiment of the single soldier gun sight is done,and the distribution of the return illuminance of the gun aiming system in different Jiao Chengdu wavelength is obtained under different wavelength detection laser conditions,so as to select the best detection wavelength.The key surface of the echo mechanism of the infrared objective is simulated.The simulation results show that when the near-infrared detection of laser is used to irradiate the infrared objective,the reflected beam of the focal plane is more concentrated than the reflected echo beam of the front surface of the infrared object.When an infrared objective is irradiated by a visible band laser,the reflected echo energy of the front surface is similar to that of the reflected echo beam of the focal plane.A laser active detection device is designed,and the principle structure of the device is introduced.The echo spot of the receiving system is collected under the condition of different defocus,different detection distance and different detection laser wavelength.The validity of the theoretical analysis is verified by simulation and experiment.