Development of a new readout system for the near-infrared detector of HONIR
Development of a new readout system for the near-infrared detector of HONIR
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HONIR近红外探测器新型读出系统的开发
DOI：
10.1117/12.2055388
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发表时间：
2014
期刊：
影响因子：
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通讯作者：
Y. Hashiba
中科院分区：
文献类型：
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作者：
T. Ui;S. Sako;T. Yamashita;H. Akitaya;K. Kawabata;H. Nakaya;Y. Moritani;R. Itoh;K. Takaki;T. Urano;I. Ueno;T. Ohsugi;Michitoshi Yoshida;H. Nakao;Y. Hashiba
我们开发了一种新的读出系统的近红外探测器VIRGO-2K（2kx 2k HgCdTe阵列）安装在光学-红外同步相机，HONIR，为1.5米金田望远镜在东广岛天文台。此开发的主要目标是通过探测器的16个输出读出模式在约1秒内读出一帧，以减少每次曝光的开销时间。该系统是基于一个CCD控制器，Kiso阵列控制器（KAC）。我们重新设计了KAC的模拟部分，以适应VIRGO-2K。采用全差分输入电路和三阶Bessel低通滤波器来降低噪声，采用恒流系统来提高检波器的线性度。我们将贝塞尔低通滤波器的截止频率设置为读出时钟速率（120 kHz）。我们还根据VIRGO-2K的数据表将恒定电流设置为200 μA。我们在室温下测试了新的读出系统，并确认低通滤波器按设计运作良好。在VIRGO-2K的典型输出电压范围（3.2-4.4 V）内，恒流系统的电流水平波动小于2%。我们测量了由新读出系统（连接到冷却多路复用器）引起的读出噪声，发现其为30-40 μV rms，与VIRGO-2K的典型读出噪声（37 μV rms）相当或略高。
We developed a new readout system for the near-infrared detector VIRGO-2K (2kx2k HgCdTe array) installed in the optical-infrared simultaneous camera, HONIR, for the 1.5 m Kanata telescope at Higashi-Hiroshima observatory. The main goal of this development is to read out one frame within ~ 1 second through 16 output readout mode of the detector, in order to reduce the overhead time per exposure. The system is based on a CCD controller, Kiso Array Controller (KAC). We redesigned the analog part of KAC to fit VIRGO-2K. We employed a fully differential input circuit and a third order Bessel low-pass filter for noise reduction and a constant current system to improve the linearity of the detector. We set the cutoff frequency of the Bessel low-pass filter at the readout clock rate (120 kHz). We also set the constant current at 200 μA according to the data sheet of VIRGO-2K. We tested the new readout system at room temperature and confirmed that the low-pass filter works well as designed. The fluctuation of the current level of the constant current system is less than 2% for the typical output voltage range of VIRGO-2K (3.2-4.4 V). We measured the readout noise caused by the new readout system (connected to cooled multiplexer) and found that it is 30-40 μV rms, being comparable to or slightly higher than the typical readout noise of VIRGO-2K, ∼ 37 μV rms.
光学和近红外多用途仪器 HONIR
DOI：
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发表时间：
2012
期刊：
影响因子：
--
作者：
Sakimoto;K.;Kawabata;K.~S.;Yoshida;M.;et al.
通讯作者：
et al.