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251,425 Views • Jun 10, 2022 • Click to toggle off description
00:00 General intro
01:54 Required level of precision
07:12 Measuring surface shapes with interferometry
10:46 Fringe evaluation with DFTfringe
12:12 Optical Pitch polishing
17:19 Making molds using 3D printing
18:18 Results with variable surface tools
21:06 Primary mirror
22:20 Point Diffraction Interferometry (PDI)
26:48 Visual performance
29:58 NO MORE NAPS (featuring Dr. Fullersheit)
Links mentioned in the video:
Website with the best and most detailed information on telescope optics:
www.telescope-optics.net/. This is the direct link to the page about the different criteria and how they relate to aberrations: www.telescope-optics.net/effects1.htm
The 3D-printer used was manufactured by 3Bfab. More information on their products can be found on their website: 3bfab.com/ (not sponsored content - they did neither ask nor pay me to show their product)
DFTfringe software is programmed by Dale Eason. This is the link to his YouTube channel: / @daleeason9687
The software can be downloaded from:
github.com/githubdoe/DFTFringe/releases
This is the link to the interferometry group on DFTfringe that Dale runs:
groups.io/g/Interferometry
The Point Diffraction Interferometer can be purchased for about 50 Euros from Michael Koch at www.astro-electronic.de/
(not sponsored content)
Other videos in this series:
Part 0: Tiny telescope concept video (featuring Rik): • Why is this Space Telescope so Tiny?
Part 1: Optical Design and Aspherics; • Making a Monolithic Telescope Part 1:...
Part 2: Machining Glass; • Making a Monolithic Telescope Part 2:...
Special thanks to Dr. Liam Fullersheit for his guest appearance. (;-).
Views : 251,425
Genre: Science & Technology
Date of upload: Jun 10, 2022 ^^
Rating : 4.969 (84/10,914 LTDR)
RYD date created : 2024-05-18T01:04:52.13282Z
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YouTube Comments - 690 Comments
Top Comments of this video!! :3
though these videos i'm just drawn to think how much better/faster i would have learned at university if taught through projects like this one. Having to tackle both theoretical and practical/technological problems and solutions in order to achieve a practical goal.
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I have an idea how to make the contrast better. I believe a problem with black paint is that it’s not intended to be black to what it’s painted on but rather towards outside observation. This means that some paints rely on their drying process to create a surface structure that helps with absorbing light. It obviously doesn’t do that on the side that’s sticking to the material though. I believe a method that could work well is to use an epoxy resin in which you use something like activated coal as a pigment as this should absorb light very nicely.
I admit I don’t have any experience in this field but I believe this might be worth testing.
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Setting aside your disappointment with wavefront accuracy, I have to say that your presentation and explanation are of the highest quality..! Many folk can grind glass, and perhaps expensive machines can do it more accurately, but very few here on the 'tube surpass your quality of content..!
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Honestly, this video series is perhaps one of the most interesting I've seen the entire time I've been on YouTube. It makes something quite obscure much more accessible.
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Aww hell yeah! Looking forward to watching this, and thanks for continuing the series!!
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amazing.
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awesome!!
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Really nice!
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amazing work
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mind blowing!
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Awesome
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Fascinating!!
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Impressive
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Pretty cool.
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Marvelous!
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amazing, as ever.
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cool
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great video
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Thank you :)
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@AppliedScience
1 year ago
It's really great to see everything coming together in the final product. Very cool project! Did you ever find out about the difference in apparent focal length vs designed focal length? Is it possible that the microns of surface adjustment can affect the focal length that much?
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