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一台高精度天文望远镜

2018-3-31 18:59| 发布者: dymodel| 查看: 71| 评论: 0|原作者: child

摘要: 这是一台高精度的六英寸天文望远镜,带有一个光线追踪程序。天文望远镜反射镜的焦距为30英寸,反射率为92%。天文望远镜(Astronomical Telescope)是观测天体的重要工具,可以毫不夸张地说,没有望远镜的诞生和发展,就 ...
这是一台高精度的六英寸天文望远镜,带有一个光线追踪程序。天文望远镜反射镜的焦距为30英寸,反射率为92%。天文望远镜(Astronomical Telescope)是观测天体的重要工具,可以毫不夸张地说,没有望远镜的诞生和发展,就没有现代天文学。随着望远镜在各方面性能的改进和提高,天文学也正经历着巨大的飞跃,迅速推进着人类对宇宙的认识。
高精度天文望远镜

The image you see here is a virtual model of the telescope created in Pov-Ray, a ray tracing program. Pov-Ray is not a CAD program but does allow modelling of all aspects of the design, including the optics. The mirror is correctly modeled with a focal length of 30 inches and a reflectivity of 92%. These images are orthographic projection with no perspective.
DESIGN FEATURES
Aluminum-graphite construction. The negative linear coefficient of expansion of the graphite truss rods exactly balances the expansion/contraction of the aluminum parts resulting in a telescope that does not change length with temperature. A similar system is used on the Hubble Space Telescope. No tube currents. This scope will be used in -10 to -15 conditions at times and the ability to cool down quickly is the primary reason for the design. It minimizes how much I cool down!The faces of any aluminum part visible to the mirrors are sandblasted and anodized black providing very low reflectance. The mounting cage assembly can be moved forward and back to adjust balance as required. The helical focuser shown has been canceled. I am building a Crayford instead. All fasteners have been changed to countersunk stainless steel.The graphite truss rods are hollow and the total weight of all the truss rods is about 270 grams.The spider assembly shown here is not accurate. The final spider assembly will be a unique semi-curved design. It looks like the finished weight including mirrors will be about 3.2 kilos (about seven pounds). This is a little heavier than I had planned but I always have a tendency to overbuild. The structure is proving to be as rigid as a solid tube.
The telescope is now complete. See below for pictures 
PLAN VIEW
 
MIRROR CELL
 


 
Note that in the above picture that the scope is not on a mount but a unrelated mock-up to take the photo.
 

 

 

 

 

 

 

 

 

This is the completed telescope and mount. I may still need to anodize some more of the components. It is not dark enough at night right now for me to  

 

 

 

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