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arXiv 1806.02191astro-ph.IM
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SPARC4 CCD的特性

Characterization of the SPARC4 CCDs

D. V. Bernardes, E. Martioli, C. V. Rodrigues

摘要:

我们提出的四个iXon超888 CCD相机的SPARC 4仪器,这将安装在1.6米望远镜的皮科多斯迪亚斯天文台在巴西的光度特性。我们应用实验方法系统地表征了CCD的读取噪声、电子增益、暗电流和量子效率。我们已经分析了读取噪声的统计分布,以及其空间梯度和时间变化性,其中我们获得了6.33个电子的读取噪声的平均值。我们应用Janesick方法来确定电子增益,其中我们获得3.35 e-/ADU的平均值。在CCD内部温度为-70 ° C时,获得了0.00014e-/pix/s的平均暗电流。我们已经检查了暗电流与温度的依赖关系和暗电流的空间分布,我们发现在CCD 9917中有一个可变的轮廓。我们开发了一个实验,使用工作台安装的单色仪,以获得在350 nm和1100 nm之间的光谱范围内的量子效率的光谱依赖性,其中我们测量了每个相机的量子效率。相机9915呈现出95.8%的最高量子效率。我们的结果与制造商的结果进行了比较。这些实验使我们能够诊断这些CCD相机,一个重要的子系统的SPARC 4仪器的性能。它还提供了一种系统的方法来监测CCD的老化。

英文摘要:

We present the photometric characterization of the four iXon Ultra 888 CCD cameras of the SPARC4 instrument, which will be installed on the 1.6 m telescope of the Pico dos Dias Observatory in Brazil. We applied experimental methodologies for a systematic characterization of the read noise, electronic gain, dark current, and quantum efficiency of the CCDs. We have analyzed the statistical distribution of the read noise, and also its spatial gradient and temporal variability, where we obtained an average value of the read noise of 6.33 electrons. We applied the Janesick method to determine the electronic gain, where we obtained an average value of 3.35 e-/ADU. We have also obtained an average dark current of 0.00014 e-/pix/s for CCD internal temperature of -70 oC. We have inspected the dependency of the dark current with temperature and the spatial distribution of the dark current, where we found a variable profile in the CCD 9917. We developed an experiment using a bench mounted monochromator to obtain the spectral dependency of the quantum efficiency in the spectral range between 350 nm and 1100 nm, where we measured the quantum efficiency for each camera. The camera 9915 presents the highest quantum efficiency of 95.8 %. Our results are compared with those from the manufacturer. These experiments allow us to diagnose the performance of these CCD cameras, an important sub-system of the SPARC4 instrument. It also provides a systematic way for monitoring the aging of the CCDs.

机构、总结、中文摘要均由AI分析而来,可能存在错误,请以论文正文为准。

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