The Prototype Segmented Mirror Telescope is a 1.3 m aperture, seven segment telescope, being developed as a technology demonstrator for India’s large optical-IR telescope project. For this segmented mirror telescope, a Shack Hartmann sensor based alignment device has been designed and developed. The device not only precisely captures the segment misalignment but also measures the segment focus error with an accuracy of a few microns and hence helps in the tip-tilt correction and co-focusing of the mirror segments. The device is designed to work primarily in two different modes: the Shack–Hartmann mode and the imaging mode. After completion of the alignment procedure, the final image quality can be checked in the imaging mode. The device is designed in such a way that it also has a provision to conduct the Keck kind of phasing experiment with one pair of mirror segments. To make the device cost effective, only off-the-shelf components are used. The optical design and opto-mechanical analysis of the device were carried out using Zemax and SolidWorks software. Then, the device was realized and its extensive testing was carried out in the laboratory. Here, we have presented the details of the opto-mechanical design and analysis as well as the preliminary results of performance tests conducted in the laboratory.

中文翻译：

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原型分段镜面望远镜对准装置的研制

分段镜面望远镜原型是一款 1.3 m 孔径、七段望远镜，是作为印度大型光学红外望远镜项目的技术演示器而开发的。对于这种分段镜面望远镜，我们设计并开发了基于夏克哈特曼传感器的对准装置。该设备不仅可以精确捕获分段未对准，还可以以几微米的精度测量分段聚焦误差，从而有助于镜分段的倾斜校正和共聚焦。该设备设计主要在两种不同的模式下工作：Shack-Hartmann 模式和成像模式。完成对准过程后，可以在成像模式下检查最终图像质量。该设备的设计方式使得它还可以用一对镜段进行 Keck 类定相实验。为了使设备具有成本效益，仅使用现成的组件。使用Zemax和SolidWorks软件对该器件进行光学设计和光机分析。然后，该装置被实现，并在实验室进行了广泛的测试。在这里，我们介绍了光机械设计和分析的细节以及在实验室进行的性能测试的初步结果。