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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 calculation formula of the irradiance contrast of the spaceborne infrared detector at the detector under the dual background of the ground and the atmosphere is deduced. The absolute contrast and the relative contrast of the target and the background at different temperatures and altitudes are calculated. The analysis shows that with the increase of target temperature and height, absolute contrast and relative contrast increase correspondingly in the wavelength greater than 2.5μm. The higher the target height, the smaller the change of contrast with the target height under the same distance. The wavelength of less than 2.5μm needs to consider the sun When the target is at a height of 0 km, the range of 2.9 ~ 4.1μm is the best detection band. As the target height increases, the range of the available detection band increases and the peak wavelength shifts slightly toward the shortwave. When the target height is greater than 10 km , The relative contrast peak between 2.6 ~ 2.8μm; the closer to the ground, the greater the attenuation of infrared radiation on the atmosphere.