| 星载红外探测对比度的计算与分析 |
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| 引用本文： | 田昌会,蔡明,杨百愚,范琦,王斌科,王伟宇,屈绍波.星载红外探测对比度的计算与分析[J].红外与激光工程,2014,43(3):737-741. |
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| 作者姓名： | 田昌会 蔡明 杨百愚 范琦 王斌科 王伟宇 屈绍波 |
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| 作者单位： | 1.空军工程大学理学院,陕西西安710051 |
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| 基金项目： | 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) |
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| 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2.5 m 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2.5 m 需考虑太阳的影响;当目标在0 km 高度时，2.9~4.1 m 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2.6~2.8 m 之间;距离地面越近，大气对红外辐射的衰减越大。
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| 关 键 词： | 红外辐射 星载探测 对比度 |
| 收稿时间： | 2013-07-10 |
Calculation and analysis of contrast for satellite-borne infrared detector |
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| Affiliation: | 1.College of Science,Air Force Engineering University,Xi'an 710051,China |
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| Abstract: | 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 2.5 m. 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 2.5 m. For target at 0 km altitude, 2.9-4.1 m 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 2.6-2.8 m. The nearer the target is from the ground, the higher the atmospheric attenuation is to infrared radiation. |
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