星DICE II:对未冷却的红外热摄像头进行校准,以对大气灰色灭绝的特征进行鉴定
Kélian Sommer1, Bertrand Plez1, Johann Cohen-Tanugi1,2
1Laboratoire Univers et Particules de Montpellier, Université de Montpellier, Centre National de la Recherche Scientifique, F-34095 Montpellier, France.
Sensors (Basel, Switzerland)
|July 27, 2024
概括
这项研究引入了红外热摄像头的新校准方法,这对于天文学调查至关重要. 开发的前建模方法确保了精确的辐射测量,改善了大气灭绝评估.
科学领域:
- 天文学和天体物理学
- 计量学 计量学是一门学科.
- 光学工程是指光学工程.
背景情况:
- 下一代宇宙调查需要在灰色频段中进行高精度校准 (1 mmag).
- 大气传输变化给天文观测带来了显著的系统性不确定性.
- 红外热摄像头为监测大气灰色灭绝提供了一个潜在的解决方案,但需要精确的校准.
研究的目的:
- 开发和验证用于未冷却红外热摄像机的新型校准过程.
- 为了能够准确地测量大气灰色灭绝,用于天文学调查.
- 解决温度诱导的影响,提高热成像系统的空间/时间精度.
主要方法:
- 开发了一种量身定制的前建模方法,包括传感器,外和环境温度,以及原始数字响应.
- 在气候室内使用FLIR Tau2摄像头进行实验测量,对温度调节的黑体源进行成像.
- 校准过程旨在以物理单位检索场景辐射.
主要成果:
- 校准过程有效地实现了精确的辐射测量.
- 时间像素分散在0.09W m-2 sr-1时被测量.
- 发现残余空间噪声为0.03 W m-2 sr-1.
结论:
- 拟议的校准方法提高了用于天文学应用的红外热摄像机的准确性.
- 精确的辐射测量是可以实现的,减轻大气传输的系统性不确定性.
- 摄像机的热环境显著影响场景辐射检索准确度,特别是在环境温度升高时.
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