Crazy Idea...?
- Bob Yoesle
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Crazy Idea...?
Removed.
Last edited by Bob Yoesle on Wed Apr 10, 2019 5:04 pm, edited 2 times in total.
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- marktownley
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Re: Crazy Idea...?
The concept is sound.
http://brierleyhillsolar.blogspot.co.uk/
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- Bob Yoesle
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Re: Crazy Idea...?
Removed.
Last edited by Bob Yoesle on Wed Apr 10, 2019 5:05 pm, edited 1 time in total.
Diagonally parked in a parallel universe.
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- Valery
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Re: Crazy Idea...?
I am quite pessimistic here. All these optical liquids have too high temperature dependance of their refractive indexes. Leackage problem is also not very easy to solve.
Temperature gradients within the etalon is a major problem as well. The TEC system must be much more precise than the systems which used now in DS and SS now.
If you need a wider sweet spot, it is easier to use a larger etalon or to use a telecentric system for air-spaced etalons. In the case of telecentric, if we will stay at F/50 and the etalon is narrow enough, then it will work. See the attached photos taken with Quark and anti-Quark. I can only add that the anti-Quark works better visually - an eye does not see non-uniformity accross the FOV like in PE or RG grade etalons, but Quark has a bit tighter bandwidth. The image scale is about 67% of original, telescope is C11 and both etalons worked at F/43.
If to use a selected air-spaced etalon larger than a typical amateur PST Mod, then sweet spot is wide enough for covering of such a sensor like IMX174 at F/20 at it.
When to tilt an etalon in such a scheme we will see that a round sweet spot transforms in a wide arc-like band. If to orient the camera frame x-axis along with the band, then we will prpbably not see this effect within a camera FOV.
Valery
Temperature gradients within the etalon is a major problem as well. The TEC system must be much more precise than the systems which used now in DS and SS now.
If you need a wider sweet spot, it is easier to use a larger etalon or to use a telecentric system for air-spaced etalons. In the case of telecentric, if we will stay at F/50 and the etalon is narrow enough, then it will work. See the attached photos taken with Quark and anti-Quark. I can only add that the anti-Quark works better visually - an eye does not see non-uniformity accross the FOV like in PE or RG grade etalons, but Quark has a bit tighter bandwidth. The image scale is about 67% of original, telescope is C11 and both etalons worked at F/43.
If to use a selected air-spaced etalon larger than a typical amateur PST Mod, then sweet spot is wide enough for covering of such a sensor like IMX174 at F/20 at it.
When to tilt an etalon in such a scheme we will see that a round sweet spot transforms in a wide arc-like band. If to orient the camera frame x-axis along with the band, then we will prpbably not see this effect within a camera FOV.
Valery
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- ANTI-QUARK VS QUARK CHORM 1.png (1.26 MiB) Viewed 2976 times
Last edited by Valery on Mon Apr 08, 2019 8:32 pm, edited 2 times in total.
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Re: Crazy Idea...?
Bob,
I like the idea!
Not sure how you would control/ achieve the nominal separation (gap) and maintain it...Temperature control is one avenue.....
I like the idea!
Not sure how you would control/ achieve the nominal separation (gap) and maintain it...Temperature control is one avenue.....
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https://groups.io/g/astronomicalspectroscopy
http://astronomicalspectroscopy.com
"Astronomical Spectroscopy for Amateurs" and
"Imaging Sunlight - using a digital spectroheliograph" - Springer