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首页> 外文会议>Conference on Optics in Atmospheric Propagation and Adaptive Systems Ⅳ Sep 18-20, 2001, Toulouse, France >Combined Held 3-5μm and 8-14μm infrared imaging: approaches to extracting target's bi-directional reflectivity and emissivity
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Combined Held 3-5μm and 8-14μm infrared imaging: approaches to extracting target's bi-directional reflectivity and emissivity

机译：联合3-5μm和8-14μm红外成像：提取目标物的双向反射率和发射率的方法

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摘要

Theoretical and experimental work has been conducted to assess the feasibility of the retrieval of target's emissivity and bidirectional reflectivity from broadband infrared imaging systems. Focus was on the [3-5μm] band II region where very little information is available. For accurate handling of the measured at-sensor radiance, account must be taken of target-to-sensor air layer, even for short distances, particularly in band II where atmospheric CO2 has a strong absorption band around 4.26蘭 It is shown that full integral expression over the spectral bandwidth of the instrument must be used and that usual factorization of contributions due to target, atmosphere and radiometer may lead to large errors when inverting the signal for emissivity or bi-directional reflectivity. Although retrieval of band II target's emissivity is, as a rule, extremely difficult outdoor conditions for natural surfaces, this work demonstrates that a multi-temporal regression method gives very good results with attainable accuracy on emissivity within 2%. Estimate of retrieving errors due to necessary approximations made in the formulation of the signal has been made via simulations. Experimental verification based on actual data acquired in outdoor conditions is in progress.
机译：已经进行了理论和实验工作，以评估从宽带红外成像系统检索目标的发射率和双向反射率的可行性。重点放在[3-5μm] II波段区域，那里几乎没有信息。为了准确处理测得的传感器辐射，即使在很短的距离内，也必须考虑目标到传感器的空气层，特别是在波段II中，大气中的CO2在4.26兰附近具有很强的吸收波段。必须使用仪器频谱带宽上的积分表达式，并且当将信号转换为发射率或双向反射率时，由于目标，大气和辐射计引起的通常的因式分解可能会导致较大的误差。虽然通常要恢复II波段目标的发射率是在自然表面上非常困难的户外条件，但这项工作表明，多时相回归方法可提供非常好的结果，发射率的精度可达到2％。已经通过仿真对由于信号公式化中必要的近似而导致的检索误差进行了估计。正在基于室外条件下获取的实际数据进行实验验证。

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