Pre-flight optical test and calibration for the Cosmic Infrared Background ExpeRiment 2 (CIBER-2)
Pre-flight optical test and calibration for the Cosmic Infrared Background ExpeRiment 2 (CIBER-2)
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宇宙红外背景实验 2 (CIBER-2) 的飞行前光学测试和校准
DOI：
10.1117/12.2561917
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发表时间：
2020
期刊：
影响因子：
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通讯作者：
Tsumura K. et al.
中科院分区：
文献类型：
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作者：
Takimoto Koji;Tsumura K. et al.
星系的总积分辐射被称为河外背景光（EBL），是了解宇宙历史中星星形成历史的重要观测数据。由宇宙红外背景实验（CIBER）、斯皮策和AKARI测量的红外EBL的空间波动超过了单独来自星系团的预测信号。CIBER-2项目旨在通过在亚轨道探空火箭飞行期间在地球大气层上方进行测量，将CIBER对EBL的观测从近红外扩展到光学。该实验有一个液氮冷却的28.5厘米卡塞格伦望远镜，沿着有三个光路和二向色分束器，用于获得0.5-2.0 μm之间的六个宽光谱波段的三个宽视场图像。三个焦平面还包含线性可变滤波器（LVF），其在相同范围内同时获取分辨率R=20的光谱。CIBER-2计划在新墨西哥州沙漠的白色沙滩导弹靶场的黑布兰特IX探空火箭上多次发射。对于计划于2021年初进行的首次飞行，我们已经完成了各种飞行前光学测试，我们使用这些测试来进行焦点调整，光谱响应测量和绝对光度校准。在本文中，我们描述了这些测试背后的方法，并提出了他们的飞行前性能评估的结果。特别是，我们提出了测量的PSF为每个宽光谱带，沿着与绝对校准因子为每个波段和LVF。通过单色扫描，我们还测量了每个LVF的光谱响应度作为位置的函数。
The total integrated emission from galaxies, known as the Extragalactic Background Light (EBL), is an important observable for understanding the history of star formation over the history of the universe. Spatial fluctuations in the infrared EBL as measured by the Cosmic Infrared Background ExpeRiment (CIBER), Spitzer and AKARI exceed the predicted signal from galaxy clustering alone. The CIBER-2 project seeks to extend CIBER observa- tions of the EBL throughout the near infrared into the optical, through measurements above Earth's atmosphere during a suborbital sounding rocket flight. The experiment has a LN2-cooled 28.5 cm Cassegrain telescope along with three optical paths and dichroic beamsplitters, which are used to obtain three wide-field images in six broad spectral bands between 0.5-2.0 μm. The three focal planes also contain linear variable filters (LVFs) which simultaneously take spectra with resolution R=20 across the same range. CIBER-2 is scheduled to y multiple times on a Black Brant IX sounding rocket from White Sands Missile Range in the New Mexico desert. For the first flight, scheduled for early 2021, we have completed a variety of pre-flight optical tests, which we use to make focus adjustments, spectral response measurements, and absolute photometric calibrations. In this paper, we describe the methods behind these tests and present their results for pre-flight performance evaluation. In particular, we present measurements of the PSF for each broad spectral band, along with absolute calibration factors for each band and the LVF. Through monochromator scans, we also measure the spectral responsivity of each LVF as a function of position.