403mm已经开磨,设计图纸及镜子现状
403mm已经开磨,设计图纸及镜子现状
403mm设计图纸
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- 夸克星
- 文章: 3847
- 註冊時間: 週四 09 10月, 2003 21:06
Dear Mr. Poon,
There is a major flaw in your mirror cell design. Your floating points are in 4 groups instead of three.
How could you make sure that all the 12 points are in equal contact with the mirror back surface at the same time ?
Since your mirror blank is so thick, there is absoluetly no need to use floataton system. Double sided foam gluing tape is already good enough. My 16 inches mirror has a thickness of 1 inch onmly. It shows no astigmatism even using 6 points double glue.
Best regards
Chan Yuk Lun
There is a major flaw in your mirror cell design. Your floating points are in 4 groups instead of three.
How could you make sure that all the 12 points are in equal contact with the mirror back surface at the same time ?
Since your mirror blank is so thick, there is absoluetly no need to use floataton system. Double sided foam gluing tape is already good enough. My 16 inches mirror has a thickness of 1 inch onmly. It shows no astigmatism even using 6 points double glue.
Best regards
Chan Yuk Lun
Mini Poon,.
Hi! Good work.
It takes me sometime to find out the information about designing the cassegrain telescope.
For classical cassegrain, the secondary mirror should be a convex mirror.
The focal ratio of the parabolic primary mirror is around f/3~ f/4.
With different focal ratio of the hyperbolic secondary, the combined final focal ratio is about f/9 ~ f/13.
For RC cassegrain it is about f/8.
You should determine the size of the secondary so that you limit the percentage of obstruction, that is how much light is blocked by the secondary mirror, this will affect the sharpness of the image.
Reference:
1) Telescope Optics
http://www.telescope-optics.net/two-mirror.htm
2) DFM
http://www.dfmengineering.com/cct_16.html
3) RCOS
http://www.rcopticalsystems.com/telescopes/
Wongsir
2010-01-03
Hi! Good work.
It takes me sometime to find out the information about designing the cassegrain telescope.
For classical cassegrain, the secondary mirror should be a convex mirror.
The focal ratio of the parabolic primary mirror is around f/3~ f/4.
With different focal ratio of the hyperbolic secondary, the combined final focal ratio is about f/9 ~ f/13.
For RC cassegrain it is about f/8.
You should determine the size of the secondary so that you limit the percentage of obstruction, that is how much light is blocked by the secondary mirror, this will affect the sharpness of the image.
Reference:
1) Telescope Optics
http://www.telescope-optics.net/two-mirror.htm
2) DFM
http://www.dfmengineering.com/cct_16.html
3) RCOS
http://www.rcopticalsystems.com/telescopes/
Wongsir
2010-01-03
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I think it is possible to use 4 groups @ 2x2Chanlunlun 寫:Dear Mr. Poon,
There is a major flaw in your mirror cell design. Your floating points are in 4 groups instead of three.
How could you make sure that all the 12 points are in equal contact with the mirror back surface at the same time ?...
But the main problem could be the PLOP software may not support such cell design...
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