Operation and performance of the mid-infrared camera, NOMIC, on the Large Binocular Telescope
Operation and performance of the mid-infrared camera, NOMIC, on the Large Binocular Telescope
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大型双目望远镜上的中红外相机 NOMIC 的操作和性能
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发表时间：
2014
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通讯作者：
B. Mennesson
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作者：
W. Hoffmann;P. Hinz;D. Defrére;J. Leisenring;A. Skemer;P. Arbo;M. Montoya;B. Mennesson
中红外（8-13 μm）照相机NOMIC是大型双目望远镜干涉仪搜索近地恒星周围的外黄道光的关键组成部分。它是为零干涉测量优化的，但具有直接成像、低分辨率光谱测量和斐索干涉测量的一般能力。该相机使用雷神1024 x1024 Si：As IBC Aquarius阵列，间距为30 μm，在天空上产生0.018弧秒像素。这为单个8.4米LBT孔径提供了0.27弧秒的10 μm波长空间分辨率（λ/D），为双孔径Fizeau干涉测量提供了0.10弧秒的空间分辨率。该阵列是由一个差分放大器和康奈尔大学为索菲亚天文台的FORCAST仪器开发的16通道阵列控制器的一个版本操作的。在2.4 MHz像素速率下，相机可以实现短至27毫秒的全阵列和3毫秒的部分阵列积分时间。大范围的积分时间和两个阵列积分孔尺寸允许阵列上的大范围背景通量。我们描述了相机的设计和操作，并提出了该系统的线性度，噪声，量子效率，图像质量和光度灵敏度方面的性能。
The mid-infrared (8-13 μm) camera, NOMIC, is a critical component of the Large Binocular Telescope Interferometer search for exozodiacal light around near-by stars. It is optimized for nulling interferometry but has general capability for direct imaging, low resolution spectrometry, and Fizeau interferometry. The camera uses a Raytheon 1024x1024 Si:As IBC Aquarius array with a 30 μm pitch which yields 0.018 arc-second pixels on the sky. This provides spatial resolution (λ/D) at a 10 μm wavelength of 0.27 arc-seconds for a single 8.4 meter LBT aperture and of 0.10 arcseconds for Fizeau interferometry with the dual apertures. The array is operated with a differential preamplifier and a version of the 16 channel array controller developed at Cornell University for the FORCAST instrument on the Sofia Observatory. With a 2.4 MHz pixel rate the camera can achieve integration times as short as 27 milliseconds full array and 3 milliseconds partial array. The large range of integration times and two array integration well sizes allow for a wide range of background flux on the array. We describe the design and operation of the camera and present the performance of this system in terms of linearity, noise, quantum efficiency, image quality, and photometric sensitivity.