一、引 言 随着科学技术的发展,人类的观测范围从可见光扩展到红外、紫外和软X射线波段.例如,宇宙空间在在着大量紫外、X射线辐射源——恒星、河外星系、类星体等.通过对这些天体的研究,有助于了解天体的演化过程.由于地球大气的的吸收,这些紫外、X射线达不到地面,限制了人类对 I. INTRODUCTION With the development of science and technology, human’s observation range extends from visible light to infrared, ultraviolet and soft X-ray wavebands. For example, in the universe in a large number of UV, X-ray radiation source - stars, extragalactic galaxies, quasars, etc. Through the study of these celestial bodies, it helps to understand the evolution of the celestial bodies, which, due to the absorption of the earth’s atmosphere, do not reach the ground and limit humanity’s