LAMOST光纤定位子系统测量装置

The Measurement System for Fiber Positioning Sub-system of LAMOST

给出了LAMOST(大天区多目标光纤光谱天文望远镜)光纤定位子系统的测量装置。它由一块面阵CCD,一个图像采集卡和一个光学镜头组成。光纤位于子系统焦面,由面阵CCD拍摄下来通过图像采集卡传送至主机。利用光重心法就可以得到光纤的位置。着重介绍了测量装置的标定方法。测量装置的系统误差可以通过标定过程得到,而且像场畸变可以通过四次曲面拟和来进行修正。本测量装置可以精确地测量子系统中的光纤位置,测量精度为10μm。

It proposes the measurement system for the fiber positioning sub-system of LAMOST.It consists of an area CCD sensor,an image acquisition card,and a lens.The fiber on the focal plate is imaged on the area CCD sensor and transferred into a computer.Using the Centroid method,the position of the fiber is obtained.It is focuses on the calibration method of the digital area CCD camera.The systematic error of the measurement is figured out through the calibration procession and the optical aberration is fitted by the quartic surface.The system can measure the position of the fiber on the positioning unit precisely.The precision of the measurement system is 10μm.