Measurement and Analysis of Infrared Radiation Characteristics of Taxiing Unmanned Aerial Vehicles
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摘要: 为准确得到某型无人机红外辐射特性，用3.7~4.8 μm中波、7.7~10.3 μm长波红外热像仪对某型无人机地面滑跑状态的红外辐射亮度进行了测量，用MODTRAN大气辐射传输软件对测量过程的大气透过率、大气程辐射进行了计算。测量结果表明，该状态下无人机机身蒙皮辐射较弱，辐射亮度与地面及背景辐射亮度接近，且各个方向辐射亮度基本一致，长波波段机身蒙皮辐射亮度为相应部位中波波段辐射亮度的280倍左右；发动机辐射亮度远高于机身蒙皮辐射亮度，受机身遮挡、机体结构等原因影响，发动机辐射亮度具有方向性，后向辐射最强。Abstract: To accurately obtain the infrared radiation characteristics of an unmanned aerial vehicle (UAV), its infrared radiation luminance was measured with medium- and long-wave infrared thermal imagers of 3.7–4.8 μm and 7.7–10.3 μm, respectively, and the atmospheric transmittance and atmospheric radiation during measurement were calculated with the MODTRAN atmospheric radiation transmission software. The measurement results show that under these conditions, the radiation of the UAV fuselage skin is weak, the radiation brightness is close to the ground and background radiation brightness, and the radiation brightness is essentially the same in all directions. The radiation brightness of the fuselage skin in the long-wave band was approximately 280 times that of the corresponding part in the medium-wave band. The engine radiation brightness was much higher than that of the fuselage skin. For reasons such as fuselage shelter and structure of the body, the engine radiation brightness is directional, and the radiation is strongest in the backward direction.
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图 4 中波辐射亮度与测量角度关系
Figure 4. Relationship between mid-wave radiant intensity and test angle
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图 5 长波辐射亮度与测量角度关系
Figure 5. Relationship between long-wave radiant intensity and test angle
表 1 红外热像仪参数
Table 1 Technical parameters of measuring equipment
Parameters Mid-wave Long-wave Wavelength/μm 3.7-4.8 7.7-10.3 Focal length/mm 150 150 Pixel size/μm 28×25 28×25 Resolution/mrad 0.18 0.18 Digitalizing bit /bit 14 14 
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表 2 ISDC IRl50黑体参数
Table 2 Technical parameters of ISDC IRl50 blackbody
Parameters Value Temperature range/℃ 50-500 Irradiation area/mm2 300×300 Emissivity 0.96±0.02 Temperature resolution /℃ 0.1 Temperature accuracy/℃ ±0.2 Temperature stability/℃ 0.2
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