| The great advantage of hyperspectral imaging system is its high spectral resolution,and it can acquire many spectral features of continuous wave bands while observing the earth.Therefore,it has become a research hotspot in aviation,aerospace and other remote sensing fields.However,the existence of stray light will affect the imaging quality of the optical system and the target detection contrast.In severe cases,the target signal will be completely annihilated in the spurious radiation noise,resulting in the entire system not working properly.Therefore,there is an important theoretical and practical value for the study of stray light.This article focuses on the detection of stray light signals during imaging of optical systems.The point source transmission method is used as the stray light detection principle.First,the light source is optimized,and the light source performance is improved by solving the elliptic Monge-Ampére equation.Secondly,according to the experimental design requirements,two kinds of visible light and near-infrared light source are detected.The experimental system design and software simulation are combined to build an experimental platform.Finally,adjust the optical structure of the system under test,and repeatedly measure the irradiance of the system under test at different off-axis angles?±5°to±20°?.PST test value curve is plotted and compared with the standard lens parameter curve,and then analyzed.The system has stray light suppression levels.The results show that the PST test curve trend of the system under test is basically the same as that of the standard lens.PST<10-5 in the range of off-axis angle greater than 4°,and the curve tends to be flat.This system has better stray light suppression ability.Research on stray light signal detection technology has greatly helped the development of spectral imaging technology. |
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