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Private life of an integrating sphere: the radiant homogeneity of the Descent Imager-Spectral Radiometer calibration sphere

机译:积分球的私生活:下降成像仪光谱辐射计校准球的辐射均匀性

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摘要

Perturbations to an integrating sphere's radiant uniformity by a protruding optical system are mapped. A sphere provides the Descent Imager-Spectral Radiometer sensor head (DISR SH), a practical platform for many of its subsystems' calibrations, but the resulting nonuniformity threatens the goal of accurate radiometry. An apparatus with a nearly identical shape is built to measure the radiance variations. The radiance field is found to be very homogeneous (0-2% variations) over two-thirds of the sphere's surface area, with larger excursions near the SH, away from active fields of view. This provides an accurate platform to transfer absolute calibrations.
机译:映射了由凸出的光学系统对积分球的辐射均匀性的扰动。球体提供了下降成像仪光谱辐射计传感器头(DISR SH),这是其许多子系统校准的实用平台,但是由此产生的不均匀性威胁了精确辐射测量的目标。构建具有几乎相同形状的设备以测量辐射率变化。发现辐射场在球体表面积的三分之二上非常均匀(0-2%变化),在SH附近有较大的偏移,远离活动视场。这提供了一个传输绝对校准的准确平台。

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