Optimization Method Of The Detection Performance Of Laser Screen–based Measurement System With Back Scatter

In the test of conventional barrel weapons,light screen testing system(LSA for short)can effectively measure their key parameters such as the flying velocity,firing rate and firing dispersion.Unfortunately the traditional LSA is susceptible to some factors including sky brightness fluctuations,meteorological environmental,due to using passive photoelectric detection.Specially,it cannot be performed normally at night.A back–scatter LSA based on active photoelectric detection can effectively avoid the above problems in the traditional.Therefore,my research is focused on the back – scatter LSA in this thesis.To effectively improve the detection performance of the system,its detection model is established.Finally,numerical simulations and experiments show that the proposed theory and methods are feasible and scientific in the thesis.The main research contents and contributions are as follows:1)The development status of backscatter light screen detection system at home and abroad is reviewed,and the research status at home and abroad is summarized.On the basis of previous research,the principle of backscattering light screen detection is studied,and a new method for evaluating the detection performance of backscattering light screen testing system is proposed,which provides a basis for the following research.2)Based on its detection principle,some detection models with different structures are established,respectively,and they are modified according the characteristics of different targets.Under different conditions,simulations are performed to compare the detection results of several caliber projectiles and different fragments.Finally,an optimal model can be obtained.3)Based on the zone-block velocity measuring principle with two detection areas,the above detection principle and model of the system are used to study its acquisition rate in the velocity measurement of barrel weapon projectiles and directional prefabricated fragments,and then a mathematical model for the capture rate is established.4)A model machine of the back–scatter LSA is developed using large aperture and dual light sources of Fresnel lens is designed,and experiments are performed to verify its detection performance using two different calibers of simulated projectiles,and results show the designs of the system with single and double light sources are feasible.Specially,theoretical values are basically consistent with the measurement results,and the proposed model is correct.In this thesis,the detection technology of the back –scatter LSA is investigated,and its detection model and capture rate model are established,respectively.Simulation are performed to test and verify their performance,and the proposed models are feasible and scientific.Consequently,this is of great significance to the related theoretical researches and testingworks.