摘要
推导了星载红外探测在地面、大气双背景下探测器处的辐射照度对比度计算公式，计算了目标在不同温度、不同高度的目标与背景的绝对对比度和相对对比度。分析指出：随着目标温度、高度增加，在波长大于2.5μm区域绝对对比度与相对对比度相应增大，目标高度越高，同等距离下对比度随目标高度的变化越小；波长小于2.5μm需考虑太阳的影响；当目标在0 km高度时，2.9~4.1μm波段为最佳探测波段，随着目标高度的增加，可用探测波段范围增大，峰值波长向短波方向微移，当目标高度大于10 km时，相对对比度峰值在2.6~2.8μm之间；距离地面越近，大气对红外辐射的衰减越大。
The irradiance contrast formula of target and background for satellite-borne infrared detector under both ground and atmosphere background was derived. The absolute contrast and the relative contrast at various target altitude and temperature were calculated. The analysis conclusions show that the absolute contrast and the relative contrast increase with the target temperature and altitude for wavelength of larger than 2.5μm. The higher the target altitude is, the less the contrast changes per unit distance. The effect of the sun should be considered when the wavelength is less than 2.5μm. For target at 0 km altitude, 2.9-4.1μm is the optimum detective waveband. As the target altitude increases, the available detective waveband broadens and the peak wavelength moves to short wave direction slightly. When the target altitude is higher than 10 km, relative contrast peak value appears at 2.6-2.8μm. The nearer the target is from the ground, the higher the atmospheric attenuation is to infrared radiation.
出处
《红外与激光工程》
EI
CSCD
北大核心
2014年第3期737-741,共5页
Infrared and Laser Engineering
基金
国家自然科学基金(11274389)
陕西省自然科学基础计划研究项目(2010JM8012)
关键词
红外辐射
星载探测
对比度
infrared radiation
satellite-borne detector
contrast
