中国科学院云南天文台机构知识库

为充分利用丽江2.4 m望远镜有限的卡焦接口,提高观测效率,研制了一个双视场天文观测终端,在2.4 m望远镜上实现不同视场和图像比例尺等参数进行快速测光和高分辨成像等天文观测,以满足不同的观测需求。针对该终端对滤光片轮精度和大视场光路与小视场光路切换的精度要求,以及对电子倍增电荷耦合器件(Electron-Multiplying Charge-Coupled Device, EMCCD)相机图像采集的速度要求,采用三层电机闭环控制以及多线程并发执行等技术,实现了该终端中滤光片轮、大视场光路与小视场光路切换的精确控制,以及EMCCD相机图像的快速采集与存储。最后在实验室进行了详细测试,结果表明,所设计的控制与图像采集系统能满足各项性能指标的要求。 

To make full use of the limited interface of Lijiang 2.4-meter telescope's cassegrain focus and improve the efficiency of observation, a dua-field astronomical observation terminal is developed. This terminal will provide different FOV and image scales, and carry out astronomical observation such as rapid photometry and high-resolution imaging, so as to meet the different observational needs of astronomers. According to the requirements of the terminal for the precision of the filter wheel, the switch between the large and the small field optical path, and the speed requirements for the image acquisition of EMCCD camera, this paper uses threelayer closed-loop motor control and multi-thread technologies to realize the precise control of the filter wheel, the FOV switching, as well as the rapid image acquisition and saving of the EMCCD camera. Finally, a detailed test is carried out in the laboratory. According to the results, the control and image acquisition system we designed can meet the requirements of the terminal's performance indicators and functional indicators.