Closure phase in high-resolution optical imaging
Closure phase in high-resolution optical imaging
复制标题
高分辨率光学成像中的闭合阶段
作者：
J. Baldwin;C. Haniff;C. Mackay;P. Warner
在最佳位置用大型望远镜拍摄的长曝光光学图像的角分辨率受到大气相位波动的限制，只能达到0.5-1角秒;也就是说，比理论衍射极限差10-50倍。相比之下，通过包括三个或更多个孔的非冗余阵列的孔径掩模拍摄的短曝光图像中的条纹图案的可见光和闭合相位的测量提供了使用在无线电波长的甚长基线干涉测量（VLBI）中良好建立的方法的可靠衍射限制成像的前景。在这里，我们报告成功的第一次测量条纹的可见度和关闭阶段，这种技术，连同证据表明，该方法是适用于微弱的15等的对象。
The angular resolution of long-exposure optical images taken with large telescopes at the best sites is limited by atmospheric phase fluctuations to ∼0.5–1 arc s; that is, ∼10–50 times worse than the theoretical diffraction limit. In contrast, the measurement of visibilities and closure phases of fringe patterns in short-exposure images, taken through an aperture mask comprising a non-redundant array of three or more holes, offers the prospect of reliable diffraction-limited imaging using methods well established in very long baseline interferometry (VLBI) at radio wavelengths. Here we report successful first measurements of fringe visibility and closure phase by this technique, together with evidence that the method is applicable to objects as faint as magnitude 15.