CONTACT!
Re: CONTACT!
Yeah I do spin my plates dry first! When they get sticky, that is where the most glass is in contact. As far as even goes... Not sure. The etalon I am trying to fix has 3 spacers. The one I got from brian has 4. So not sure if 1 is missing, or if its just a new way of doing it?
I have done the contact dry. But not dried by hairdrier. Just wiped and allowed to evaporate. The remaining residue.
I have done the contact dry. But not dried by hairdrier. Just wiped and allowed to evaporate. The remaining residue.
- Merlin66
- Librarian
- Posts: 3970
- Joined: Tue Dec 13, 2011 1:23 pm
- Location: Junortoun, Australia
- Has thanked: 173 times
- Been thanked: 615 times
- Contact:
Re: CONTACT!
Rob,
I don't know about "spinning" the plates! I'd be concerned that the spacers may impact with each other (if they are on different sides) and damage/ dislodge...
It's just a matter of visual inspection to see where the spacers are and mark the edge accordingly.
I had the plates in position "floating" on the acetone and just evaporated it away - thumb pressure at the end to see if it made any difference, and the spacers appeared to "bond" - no fringes visible.....
I don't know about "spinning" the plates! I'd be concerned that the spacers may impact with each other (if they are on different sides) and damage/ dislodge...
It's just a matter of visual inspection to see where the spacers are and mark the edge accordingly.
I had the plates in position "floating" on the acetone and just evaporated it away - thumb pressure at the end to see if it made any difference, and the spacers appeared to "bond" - no fringes visible.....
"Astronomical Spectroscopy - The Final Frontier" - to boldly go where few amateurs have gone before
https://groups.io/g/astronomicalspectroscopy
http://astronomicalspectroscopy.com
"Astronomical Spectroscopy for Amateurs" and
"Imaging Sunlight - using a digital spectroheliograph" - Springer
https://groups.io/g/astronomicalspectroscopy
http://astronomicalspectroscopy.com
"Astronomical Spectroscopy for Amateurs" and
"Imaging Sunlight - using a digital spectroheliograph" - Springer
Re: CONTACT!
Yes Ken. You have to be watching the plates or know where they are as to NOT jam against another spacer! You can however feel the point where there is more drag on the plates than any other spot! And I am pretty sure there is now way I can visually tell when the space between is perfect! No eyeball is that good......
One of my plates is smaller than the others... So to see the contact of all in a uniform manner would be very tough! However.... The evaporation technique has my interest! If I must go for round 3..... That will be the method I attempt! After that... It may be replacing spacers....
One of my plates is smaller than the others... So to see the contact of all in a uniform manner would be very tough! However.... The evaporation technique has my interest! If I must go for round 3..... That will be the method I attempt! After that... It may be replacing spacers....
- Merlin66
- Librarian
- Posts: 3970
- Joined: Tue Dec 13, 2011 1:23 pm
- Location: Junortoun, Australia
- Has thanked: 173 times
- Been thanked: 615 times
- Contact:
Re: CONTACT!
Looking at the tuning spreadsheet, it seems the "optimun" spacers are 0.18mm thick...not sure that's a standard size at Home Depot or B&Q (UK);-)
"Astronomical Spectroscopy - The Final Frontier" - to boldly go where few amateurs have gone before
https://groups.io/g/astronomicalspectroscopy
http://astronomicalspectroscopy.com
"Astronomical Spectroscopy for Amateurs" and
"Imaging Sunlight - using a digital spectroheliograph" - Springer
https://groups.io/g/astronomicalspectroscopy
http://astronomicalspectroscopy.com
"Astronomical Spectroscopy for Amateurs" and
"Imaging Sunlight - using a digital spectroheliograph" - Springer
Re: CONTACT!
Lol likely not.... I mentioned to Walter earlier about the microscope slides little square glass covers. I think they are in that range? Would be cheap and readily accessible ..... Something that might be considered?
Re: CONTACT!
Its not origional equipment. But a box of 100 of these in the perfect thickness is about 7 bucks! Each is about 22x22mm so you get loads of spacers per slide! :woohoo:
- Merlin66
- Librarian
- Posts: 3970
- Joined: Tue Dec 13, 2011 1:23 pm
- Location: Junortoun, Australia
- Has thanked: 173 times
- Been thanked: 615 times
- Contact:
Re: CONTACT!
Hmmmm
Check out the spreadsheet - I think they may be too thin...
Also, I assume one plate may be 0.13 and another 0.17 etc - how do you tell the difference???
(Edit: I see these are "Pearl" finish - not optically polished flat finish..they may not make "contact")
Check out the spreadsheet - I think they may be too thin...
Also, I assume one plate may be 0.13 and another 0.17 etc - how do you tell the difference???
(Edit: I see these are "Pearl" finish - not optically polished flat finish..they may not make "contact")
"Astronomical Spectroscopy - The Final Frontier" - to boldly go where few amateurs have gone before
https://groups.io/g/astronomicalspectroscopy
http://astronomicalspectroscopy.com
"Astronomical Spectroscopy for Amateurs" and
"Imaging Sunlight - using a digital spectroheliograph" - Springer
https://groups.io/g/astronomicalspectroscopy
http://astronomicalspectroscopy.com
"Astronomical Spectroscopy for Amateurs" and
"Imaging Sunlight - using a digital spectroheliograph" - Springer
Re: CONTACT!
They do have boxes of a single size. And you can pay for better quality versions as well! They also have a .18mm version made of plastic. Not sure if that would work or not. But they are made to seal micro things to microscope slides..... So.... For spacers they may work?
- Merlin66
- Librarian
- Posts: 3970
- Joined: Tue Dec 13, 2011 1:23 pm
- Location: Junortoun, Australia
- Has thanked: 173 times
- Been thanked: 615 times
- Contact:
Re: CONTACT!
Rob,
Keep that in mind for "Plan B".....in the meantime see if you already have fixed the problem.....
Keep that in mind for "Plan B".....in the meantime see if you already have fixed the problem.....
"Astronomical Spectroscopy - The Final Frontier" - to boldly go where few amateurs have gone before
https://groups.io/g/astronomicalspectroscopy
http://astronomicalspectroscopy.com
"Astronomical Spectroscopy for Amateurs" and
"Imaging Sunlight - using a digital spectroheliograph" - Springer
https://groups.io/g/astronomicalspectroscopy
http://astronomicalspectroscopy.com
"Astronomical Spectroscopy for Amateurs" and
"Imaging Sunlight - using a digital spectroheliograph" - Springer
Re: CONTACT!
If this contact didnt work... Im going to try your Evaporation method next. After that....I will grab some slides and start cutting. Lol
- swisswalter
- Way More Fun to Share It!!
- Posts: 17948
- Joined: Thu Feb 06, 2014 4:28 am
- Location: Switzerland
- Been thanked: 1 time
- Contact:
Re: CONTACT!
Hi all
there must be a reason why older etalons have less spacers then newer ones. I noticed that on the PST etalons as well as on the LUNT LS50 Etalons. More restistance to decontacting ?
there must be a reason why older etalons have less spacers then newer ones. I noticed that on the PST etalons as well as on the LUNT LS50 Etalons. More restistance to decontacting ?
Only stardust in the wind, some fine and some less fine scopes, filters and adapters as well. Switzerland 47 N, 9 E, in the heart of EUROPE
from 7 am - 7 pm http://www.nanosys.ch
from 7.01 pm - 6.59 am http://www.wastronomiko.com some times vice versa
from 7 am - 7 pm http://www.nanosys.ch
from 7.01 pm - 6.59 am http://www.wastronomiko.com some times vice versa
- swisswalter
- Way More Fun to Share It!!
- Posts: 17948
- Joined: Thu Feb 06, 2014 4:28 am
- Location: Switzerland
- Been thanked: 1 time
- Contact:
Re: CONTACT!
Hi all
in order to transmit only 656.28 nm, I always thought that the distance of the two plates are the most important Parameter. If that is true, we have to know the exact thickness of the spacers, don't we ?
in order to transmit only 656.28 nm, I always thought that the distance of the two plates are the most important Parameter. If that is true, we have to know the exact thickness of the spacers, don't we ?
Only stardust in the wind, some fine and some less fine scopes, filters and adapters as well. Switzerland 47 N, 9 E, in the heart of EUROPE
from 7 am - 7 pm http://www.nanosys.ch
from 7.01 pm - 6.59 am http://www.wastronomiko.com some times vice versa
from 7 am - 7 pm http://www.nanosys.ch
from 7.01 pm - 6.59 am http://www.wastronomiko.com some times vice versa
- Merlin66
- Librarian
- Posts: 3970
- Joined: Tue Dec 13, 2011 1:23 pm
- Location: Junortoun, Australia
- Has thanked: 173 times
- Been thanked: 615 times
- Contact:
Re: CONTACT!
Walter,
Yes indeed.
The spreadsheet that Gert prepared for the pressure/ tilt tuning of etalons can provide an answer. According to the transmission graph for a tilted etalon, it appears that a 0.19mm spacing would give good performance.
Attached files etalon_tilt_pressure_v4.zip (78.7 KB)
Yes indeed.
The spreadsheet that Gert prepared for the pressure/ tilt tuning of etalons can provide an answer. According to the transmission graph for a tilted etalon, it appears that a 0.19mm spacing would give good performance.
Attached files etalon_tilt_pressure_v4.zip (78.7 KB)
"Astronomical Spectroscopy - The Final Frontier" - to boldly go where few amateurs have gone before
https://groups.io/g/astronomicalspectroscopy
http://astronomicalspectroscopy.com
"Astronomical Spectroscopy for Amateurs" and
"Imaging Sunlight - using a digital spectroheliograph" - Springer
https://groups.io/g/astronomicalspectroscopy
http://astronomicalspectroscopy.com
"Astronomical Spectroscopy for Amateurs" and
"Imaging Sunlight - using a digital spectroheliograph" - Springer
- Merlin66
- Librarian
- Posts: 3970
- Joined: Tue Dec 13, 2011 1:23 pm
- Location: Junortoun, Australia
- Has thanked: 173 times
- Been thanked: 615 times
- Contact:
Re: CONTACT!
I enclose a couple of images of the SM40...
The first couple shows the temporary card spacers used to centre the etalon in the housing in preparation of the "injection" of the twelve dabs of RTV - I cleaned the holes with a 2.5mm drill bit and used a medical syringe to pump the small amount needed.
I pre-loaded the etalon onto the backing foam with a 200gm load.
The other image shows (if you look carefully) the spacers around the edge.
The first couple shows the temporary card spacers used to centre the etalon in the housing in preparation of the "injection" of the twelve dabs of RTV - I cleaned the holes with a 2.5mm drill bit and used a medical syringe to pump the small amount needed.
I pre-loaded the etalon onto the backing foam with a 200gm load.
The other image shows (if you look carefully) the spacers around the edge.
"Astronomical Spectroscopy - The Final Frontier" - to boldly go where few amateurs have gone before
https://groups.io/g/astronomicalspectroscopy
http://astronomicalspectroscopy.com
"Astronomical Spectroscopy for Amateurs" and
"Imaging Sunlight - using a digital spectroheliograph" - Springer
https://groups.io/g/astronomicalspectroscopy
http://astronomicalspectroscopy.com
"Astronomical Spectroscopy for Amateurs" and
"Imaging Sunlight - using a digital spectroheliograph" - Springer
- swisswalter
- Way More Fun to Share It!!
- Posts: 17948
- Joined: Thu Feb 06, 2014 4:28 am
- Location: Switzerland
- Been thanked: 1 time
- Contact:
Re: CONTACT!
Hi Ken
thank's for the fine pics
thank's for the fine pics
Only stardust in the wind, some fine and some less fine scopes, filters and adapters as well. Switzerland 47 N, 9 E, in the heart of EUROPE
from 7 am - 7 pm http://www.nanosys.ch
from 7.01 pm - 6.59 am http://www.wastronomiko.com some times vice versa
from 7 am - 7 pm http://www.nanosys.ch
from 7.01 pm - 6.59 am http://www.wastronomiko.com some times vice versa