烟幕透过率分布的测量方法研究

Measurement of smoke screen permeability distribution

烟幕状态在空间具有渐变性,不会有突变,因此假设热像仪探测器平面的小区域内各探测器单元所接收到的辐射中由各自对应的烟幕单元所做的贡献相等,称之为"烟幕均匀性假设"。同理可以做出"大气均匀性假设"、"环境均匀性假设"以及"热像仪自身辐射干扰均匀性假设"。分析了热像仪在烟幕遮蔽前后所接收到的红外辐射的特点,并根据这些"均匀性假设",推导出烟幕透过率的计算公式,就影响烟幕透过率测量的因素进行了分析,并介绍了一种用来测量烟幕透过率分布的实验方案。

The state of smoke in space gradually changed,so this paper get the'smoke uniformity hypothesis', that is,the contribution to the radiation received by detector cells in a small area of a thermal imager detector plane from corresponding smoke cell of the detector cells are equal to each other.For the same reason,it get the 'atmosphere uniformity hypothesis','surrounding uniformity hypothesis',and'the radiation from thermal imager itself uniformity hypothesis'.Character of radiation received by the thermal imager is analyzed before and after the smoke's screening.The formula of Smoke screen permeability is educed from the former hypothesizes.The factors that influence the measurement of smoke screen are analyzed permeability,and an experiment method is introduced at last.