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Wide-Field-of-View Longwave Camera for the Characterization of the Earth’s Outgoing Longwave Radiation

机译:广泛的视野龙波相机用于地球外出的长波辐射

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摘要

The measurement of the Earth’s Outgoing Longwave Radiation plays a key role in climate change monitoring. This measurement requires a compact wide-field-of-view camera, covering the 8–14 µm wavelength range, which is not commercially available. Therefore, we present a novel thermal wide-field-of-view camera optimized for space applications, featuring a field of view of 140° to image the Earth from limb to limb, while enabling a high spatial resolution of 4.455 km at nadir. Our cost-effective design comprises three germanium lenses, of which only one has a single aspherical surface. It delivers a very good image quality, as shown by the nearly-diffraction-limited performance. Radiative transfer simulations indicate excellent performance of our camera design, enabling an estimate of the broadband Outgoing Longwave Radiation with a random relative error of 4.8%.
机译:地球的输出龙波辐射的测量在气候变化监测中起着关键作用。该测量需要紧凑的宽视野相机,覆盖8-14μm波长范围,其不商业上可用。因此,我们为空间应用提供了一种新的热宽视野相机,其特点是140°的视野,以将地球从肢体图像到肢体,同时在Nadir中实现4.455公里的高空间分辨率。我们的经济高效设计包括三个锗透镜,其中只有一个具有单个非球面表面。它提供了非常好的图像质量,如几乎衍射的性能所示。辐射转移模拟表明我们的相机设计的优异性能,使宽带传出长波辐射的估计具有4.8%的随机相对误差。

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