分光仪PSPO的光学设计

OPTICAL DESIGN OF SPECTROPHOTOMETER PSPO

本文介绍棱镜分光光度仪PSPO的光学设计结果．PSPO以TH7832双线CCD作为系统探测器，可同时观测0．365－1.0微米波长范围内的天体及周围背景的低色散光谱．仪器的入射焦比为F／18，平均光谱分辨率约为10nm．本文简单介绍了PSPO的光学调整，并给出了波长校正实验和配备名古屋大学50公分望远镜进行试观测的结果．设计和实验结果表明，光学设计很好地满足了天文课题对仪器的设计要求，PSPO已可以应用于天文观测．

The optical design of a prism spectrophotometer (PSPO) is described in this paper. the PSPO has been developed as one of the cooperative projects of Purple Mountain Observatory, National Astronomical Observatory of Japan and Faculty of Science of Nagoya University. By employing a dual linear CCD (TH7832). the instrument can be used to the low resolution spectra of an object and the nearby background simultaneously in the wide wavelength range from 0.365μm to 1.0μm.the focal ratio is designed as F/18 and the mean spectral resolution is about 10 nm.In the paper we present the results of optical ray tracing and experiment for the PSPO optical design.It is shown that the PSPO can well satisfy the observational requirements in our interested astronomical objects and we suggest that the PSPO may be used in real observations.An example of the test observations made by attaching the PSPO to the 50 cm telescope at Nagoya University is also described. Practical observations will be carried out in the near future by using the new 60 cm telescope at Nagoya University as well as the telescopes of the Joint Laboratory of Optical and Infrared Astronomy in China.