To comprehensively analyze and evaluate the combat effectiveness of the incoherent intense light, it is necessary to obtain the distance of the glare effect caused by incoherent intense light. Firstly, by applying the nominal ocular dazzle distance model proposed by Williamson, numerical calculations were conducted to determine the glare effect distance of intense light with an illuminance of 1.2×106 lx, an aperture size of 0.42 m, and a beam divergence angle of 26 mrad. The obtained results reveal the glare effect distances of a single incoherent source under different background light levels and atmospheric visibility conditions. Secondly, based on the model proposed by Mlynczak, which involves multiple intense light sources simultaneously illuminating the human eye, the glare effect distances of multiple incoherent sources under different background brightness levels and incident angles were calculated. Finally, a sensitivity analysis was conducted to assess the impact of nine factors on the distance at which the glare effect caused by incoherent intense sources. The results indicate that factors such as background brightness, atmospheric visibility, illuminance, divergence angle and incident angle have a significant impact on the glare distance of incoherent intense light.
The study of infrared radiation characteristics of buildings is of great significance in target identification, infrared precision guidance, remote sensing detection, urban planning and non-destructive testing protection of buildings under modern war. This paper takes a buildings as the research object, analyzes the infrared radiation characteristics of the buildings, and establishes the theoretical calculation model of its temperature field. Firstly, starting from various parameters of the buildings, this paper determines the geometric parameters, physical parameters, geographical parameters and meteorological parameters of the buildings through literature and field measurement. Then, the buildings is divided into two-dimensional meshes to determine the spatial position of each mesh and the geometric relationship with adjacent meshes. Each grid is regarded as a node by the control volume method, and the heat balance equation of each grid is established by using heat transfer and infrared radiation theory. The external surface of the buildings considers the environmental radiation, including solar radiation, atmospheric radiation, earth radiation, etc., plus the thermal radiation of the target itself. Constant temperature and no internal heat source environment shall be considered for the inner surface. The heat conduction between each grid is considered. Finally, the temperature distribution of the buildings surface at each time is obtained by measuring the initial temperature of the buildings. Finally, its infrared radiation characteristics are further studied.
Infrared imaging technology has garnered widespread attention due to its advantages in long-distance detection, multispectral imaging, stealth capability, and imaging in low-light environments. In this study, real-world images captured by two thermal imagers operating in the infrared bands of 3-5μm and 8-14μm were investigated to explore the infrared radiation transmission characteristics of target backgrounds and calculate their radiation contrast. The characteristics of radiation contrast between target and background in different wavelength bands were analyzed, along with the resulting image features. Specific details of the images in different wavelength bands were elucidated using histogram analysis, mean, standard deviation, and information entropy. Ultimately, a dual-band infrared image fusion algorithm was proposed based on Planck's law. Experimental results confirm that this algorithm significantly enhances image details, improves target clarity and recognizability, comprehensively presents target features, enhances target detection efficiency, and exhibits clear targeting in the fusion process.
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