A Method for Measuring and Calculating the Obscuration Area of Smoke Screen in Passive Interference Test
In the passive interference test of smoke screen,the effective obscuration area of smoke screen to infrared radiation source is an important index to evaluate and identify the comprehensive performance of smoke-forming equipment.Due to the flow diffusivity characteristics of smoke screen,the calculation method and standard of the obscuration area have become a difficult and hot spot in the industry.In this paper,we analysize the measurement principle of smoke screen obscuration area and the attenuation rate of the infrared radiation point source.Then the functional relationship is derived,which is the spatial distribution of attenuation rate in the focal plane by interpolating the attenuation rate of infrared radiant point source.The specific method steps are listed,and the interpolation effect of infrared radiation image is verified.The infrared smoke screen contour cannot be restored by interpolating,when the sampling interval is greater than 20 times the pixel spacing.According to the interpolation effect,the maximum effective distance of infrared radiant source array layout is derived.This method can be used as a reference for the layout of infrared radiation point source array in photoelectric field test.
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