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A low-noise HAWAII detector system and new cold optics for the CLASSIC/CLIMB beam combiner instrument of the CHARA Array

机译：用于Chara阵列的经典/攀登梁组合器仪器的低噪声夏威夷探测器系统和新的冷光学器件

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As part of a new collaboration between CHARA and the Max Planck Institute for Radio Astronomy, we have developed a new detector system for the CLASSIC/CLIMB beam combiner of the CHARA Array. This detector is based on the Rockwell HAWAII-1 HgCdTe focal plane array and has lower readout noise (～5 electrons) than the current PICNIC based system. Presently, CLASSIC/CLIMB observations at different wavelength bands can be made only successively by selecting individual filters in a filter wheel. Therefore, another upgrade goal is to install a non-deviating prism in order to image the H- and K'-band light onto separate detector pixels and to simultaneously observe in the H and K' bands. The detector control electronics were built at the Max Planck Institute for Radio Astronomy. The goal was to achieve the lowest possible readout noise and electronic pick-up noise. The detector readout noise can be significantly reduced by the following approach: First, the analog detector output signal is processed by a moving boxcar filter consisting of an analog approximation of a finite impulse response filter with a response time adapted to the 10 MHz sample rate of an analog-to-digital converter. Second, a digital filter averages up to 1024 samples for each addressed pixel. This hybrid (analog plus digital) filter approach gives a unique flexibility of a programmable bandwidth for optimum noise reduction.
机译：作为Chara和Max Planck射频天文学研究所之间新合作的一部分，我们开发了一个新的探测器系统，用于Chara阵列的经典/攀登梁组合器。该检测器基于Rockwell夏威夷-1 HGCDTE焦平面阵列，并且具有比当前基于野餐的系统更低的读出噪声（〜5电子）。目前，通过在滤波器轮中选择各个滤波器，可以连续地制造不同波长带的经典/爬升观察。因此，另一个升级目标是安装非偏离棱镜，以将H-and k'波段灯图像图像在单独的探测器像素上并同时观察H和K'带。探测器控制电子设备是在Max Planck射频天文学研究所建造的。目标是达到尽可能低的读数噪声和电子拾取噪声。通过以下方法可以显着降低探测器读出噪声：首先，通过移动箱电滤波器处理模拟检测器输出信号，该移动箱电滤波器由有限脉冲响应滤波器的模拟近似，其响应时间适应10 MHz采样率模数转换器。其次，为每个寻址像素的数字过滤器平均到达1024个样本。该混合动力（模拟加数字）滤波器方法提供可编程带宽的独特灵活性，以实现最佳降噪。

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