极紫外太阳望远镜(EUT)作为高分辨率空间成像仪器,其检测水平的高低直接影响EUT成像质量。在完成EUT的装调工作之后,对其成像质量进行了检测。具体方法是将分辨率板置于平行光管的焦点处,由可见光照明该分辨率板,透射光经平行光管后成为平行光束并充满待测EUT入瞳,再经EUT成像在CCD相机上,根据所得图像来判断待测望远镜分辨率。实验结果表明,EUT在可见光波段(λ=570 nm)的分辨率为1.22″,接近此波段的衍射极限(1.20″)。根据可见光检测结果估算出EUT工作波段的分辨率可以达到0.32″,能够满足设计要求。

The Extreme Ultraviolet Telescope(EUT),as a high-resolution imaging instrument,its optical performance measurement directly impacts on the image quality,so the imaging performance of aligned EUT is tested in this paper.The measuring method is to place a resolution test-target on the focal point of a collimator and the target is illuminated by a avisible light.Then,the visible light is becomed a parallel light to go through the EUT and image at focal plane on the CCD.By analysis the image,the resolution of the telescope can be obtained.The test results indicate that the angular resolution of the EUT is 1.22″(λ=570 nm),which is very close to the resolution limit(1.20″).After the computation,it concludes that the operation wavelength resolution is 0.32″,which can meet the requirement for design.