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距离选通成像系统采用的是脉冲激光主动照明与ICCD选通技术相结合的方法。为了在室内模拟测试在一定大气条件下距离选通成像系统的分辨力,设计了一套模拟测试装置。以辐射传输理论为基础,建立了大气距离选通成像系统后向散射光和信号光的模型。该模型给出了后向散射光和信号光在光电阴极面上照度随时间的变化规律。采用两个模拟光源,分别模拟了信号光和后向散射光。采用阴极面等效辐射照度法,给出了模拟光源功率的方法。以S 20光电阴极的像增强器与CCD的耦合为例,计算了模拟光源的功率。
The distance gating imaging system uses a combination of pulsed laser active illumination and ICCD gating techniques. In order to test the resolution of the gated imaging system in a certain atmospheric condition in a room simulation test, a set of simulation test equipment is designed. Based on the theory of radiative transfer, a model of backscattered light and signal light of the atmospheric distance gated imaging system is established. The model gives the law of illumination intensity of backscattered light and signal light on the photocathode surface with time. Two analog light sources were used to simulate the signal light and the backscattered light respectively. The method of simulating the power of light source is given by using the equivalent surface irradiance method of cathode surface. Taking the coupling between image intensifier and CCD of S 20 photocathode as an example, the power of the simulated light source was calculated.