CAJ | 학술논문

Hα和白光望远镜(HWT)是中国空间太阳望远镜(SST)有效载荷之一,为研究HWT的光学性能受温度环境的影响,在进行地面观测工况下温度场测量和数值模拟的基础上,确定了热光学试验的温度控制工况,建立了一套热真空状态下的光学性能检测系统.该热光学试验系统由被测光学系统、真空系统、温度测量和控制系统以及波前检测系统组成.研究了系统中光楔镜结构、副镜结构、主镜结构、准直镜结构和成像镜结构这5个关键部位在不同温度控制工况下的光学性能.试验结果表明,在副镜结构温度不高(低于40 ℃)的情况下,HWT望远镜在地面观测工况下的光学性能约为λ/8,可以满足λ/6的设计要求.以HWT为研究对象,实施了Hα和白光望远镜的热光学试验过程,实现了对不同温度控制工况下的HWT系统进行光学性能检测,探索的热光学试验思路和方法也适用于其它太阳观测光学望远镜.
Hα화백광망원경(HWT)시중국공간태양망원경(SST)유효재하지일,위연구HWT적광학성능수온도배경적영향,재진행지면관측공황하온도장측량화수치모의적기출상,학정료열광학시험적온도공제공황,건립료일투열진공상태하적광학성능검측계통.해열광학시험계통유피측광학계통、진공계통、온도측량화공제계통이급파전검측계통조성.연구료계통중광설경결구、부경결구、주경결구、준직경결구화성상경결구저5개관건부위재불동온도공제공황하적광학성능.시험결과표명,재부경결구온도불고(저우40 ℃)적정황하,HWT망원경재지면관측공황하적광학성능약위λ/8,가이만족λ/6적설계요구.이HWT위연구대상,실시료Hα화백광망원경적열광학시험과정,실현료대불동온도공제공황하적HWT계통진행광학성능검측,탐색적열광학시험사로화방법야괄용우기타태양관측광학망원경.
The Hα and White Telescope(HWT) is one of the payloads of the Chinese Space Solar Telescope(SST). To study the impact of the thermal environment on the optical performance of the HWT, the temperature conditions of the thermo-optical testing are designed on the basis of the measurement and numerical simulation of the ground observing condition. A thermo-optical testing system is established to test the optical performance of the HWT under a thermal vacuum condition. The thermo-optical testing system comprises mainly four sub-systems: an optical system to be tested, a vacuum system, a temperature measurement and control system, and a wavefront sensing system. The optical performance of the five important structures in the HWT system at the different temperature conditions is investigated, including the wedges, secondary mirror, primary mirror, collimation lens, and the imaging lens. The results show that when the temperature of the secondary mirror is lower than 40 ℃, the optical performance of HWT is about λ/8, which satisfies the requirement of λ/6. This paper implements a thermo-optical testing procedure for the HWT under different temperature control conditions.The design ideas and test methods are also applicable in similar optical telescope designs for the solar observation.