Developing new data acquisition devices for COMICS
Developing new data acquisition devices for COMICS
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为 COMICS 开发新的数据采集设备
DOI：
10.1117/12.461916
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发表时间：
2003
期刊：
影响因子：
56.9
通讯作者：
T. Yamashita
中科院分区：
文献类型：
--
作者：
S. Sako;H. Kataza;T. Miyata;Y. Okamoto;Shinya Takubo;M. Honda;T. Onaka;T. Yamashita
我们为斯巴鲁望远镜的中红外仪器COMICS开发了一种新的数据采集设备。新设备取代了我们以前的数据采集设备，但数据传输速度较低。新器件基于32位PCI总线和PC Linux，并提供总线主控DMA传输功能。它由时钟模式发生器、帧存储器和图像加法器组成。为了实现中红外仪器的高运行效率，数据处理速度以及A/D转换器的速度至关重要。在采集数据期间，以高于数据生成速率的速率将数据传送到PC上的硬盘驱动器。结果，我们成功地将 200 帧（64M 字节）的数据传输过程造成的死区时间从 60 秒减少到不到 1 秒。此外，通过将主机更换为更高性能的PC，COMICS在成像模式下的观察效率从44%提高到74%。这种基于 PCI 的数据采集设备也可以应用于其他具有快速数据速率的仪器。
We developed a new data acquisition device for COMICS, a mid infrared instrument of the Subaru telescope. The new device was installed in place of our previous data acquisition device with a lower data transfer speed. The new device is 32 bit PCI bus and PC Linux based and provides bus-master DMA transfer function. It consists of a clock pattern generator, frame memories, and an image co-adder. In order to achieve high operational efficiency for mid infrared instruments, the data handling speed is essential as well as the speed of A/D converter. The data transfer to the hard disk drive on the PC is made during acquiring the data at the rate higher than the data generation rate. As a result, we succeeded to reduce the dead time due to the data transfer procedure from 60 sec to less than 1 sec for 200 frames (64M bytes). Furthermore by replacing the host computer by a higher performance PC, the observation efficiency of COMICS was improved from 44% to 74% in the imaging mode. This PCI based data acquisition device can also be applied to the other instruments that have fast data rates.