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Post by Casethecorvetteman on Oct 17, 2016 9:51:54 GMT -5
Hi all  does anyone know the refractive index of the glass CRT lenses, such as HFQ900s and the like? What is the best optical coupling fluid that could replace glycol and possibly provide better sharpness? Im using propylene glycol at present with no problems, but if there was something better, id try it out. Id love to grab a couple bottles of Ice Clear, but i cant find anywhere to buy it. Cheers |
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Post by Casethecorvetteman on Oct 17, 2016 18:04:38 GMT -5
So i got this reply from one place:
Thank you for the inquiry. Ethylene glycol and propylene glycol both have a
refractive index of around 1.43. I wasn’t able to find the glass you
described from 3M but likely it'll have a refractive index of around
1.5-1.55. Therefore anything above 1.43 would be better than what you are
currently using. I would suggest you order a small amount of Immersion Oil
Type A, it has a refractive index of 1.515. A fl. oz and is only $8.40
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Post by Casethecorvetteman on Oct 18, 2016 21:09:14 GMT -5
IO-TypeA.pdf (136.92 KB) How good would this stuff be to use?
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Post by barclay66 on Oct 19, 2016 4:17:04 GMT -5
Hi,
I don't think the Oil is a good alternative. From the datasheet, the information on color stability seems to indicate that it will darken quite rapidly and maybe with a yellowish tint. Of course, the light from a tube may not be comparable to the light from the sun, but it still could induce the darkening. I guess that only some testing will tell...
Regards,
barclay66
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justin
Junior Member
Posts: 60 
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Post by justin on Oct 19, 2016 5:12:35 GMT -5
out of curiosity, what do these liquids do to the c element seals? whats the life span of these seals? these types of things are not produced anymore. like the marquee bellows i imagine they need to be re manufactured by someone?
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Post by Casethecorvetteman on Oct 19, 2016 6:49:40 GMT -5
No problem on any NEC or Barco, all mine are still perfectly good. Got 4 sets of Barco 9" LC housings here, theyre fine. The c-element on the Barco seals with a big o-ring, in the very unlikely event it may fail, it wont be hard to get one from somewhere that will do the job.
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Post by barclay66 on Oct 20, 2016 8:03:01 GMT -5
Hi,
I think I can get the type B immersion oil in Germany. Maybe worth a try...
Regards,
barclay66
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Post by Casethecorvetteman on Oct 20, 2016 22:53:27 GMT -5
Hi, I think I can get the type B immersion oil in Germany. Maybe worth a try... Regards, barclay66 Sounds great! I wonder if it is likely to be an improvement? |
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Post by barclay66 on Oct 21, 2016 4:09:50 GMT -5
To be honest: I don't have a clue.
These oils and fluids have been developed for acting as an optical bridge, crossing a tiny gap between the sample and the first lens of a microscope. Our application calls for a much larger amount of fluid between the tube and the C element. The curvature of the C element is prohibitive to any kind of coloration of the fluid as it would have a larger effect the closer You get to the tube edges. Some of their features will be useful for our usage (like the refractive index), some -needed for our application- could be missing as the objectives to be met were different (e.g. what about thermal conductivity?), and some could be less favorable (e.g. coloration). On the other hand, there are features that won't bother us at all; like chromatic aberration which is irrelevant in a system where we have monochromatic tubes.
I think it'll be wise to risk a small investment for research. If we can coordinate our efforts, even better. Anyone willing to participate should try a different type of fluid.
BTW: Did You know that there are several brands (including Zeiss and Nikon) and dozens of types available? I think the main differentiators are focused on refractive index (as close as possible to 1.52 with respect to a given wavelength), viscosity and self-fluorescence. So there's a lot to choose from...
Regards,
barclay66
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Post by Casethecorvetteman on Oct 21, 2016 9:47:58 GMT -5
I would be happy to give it a go here if i can get a hold of some, i have a few sets of tubes here.
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Post by barclay66 on Oct 21, 2016 11:34:53 GMT -5
Me too. That makes us two already...
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Post by Casethecorvetteman on Oct 21, 2016 18:50:08 GMT -5
Im also looking to get some Ice Clear shipped to me to see if it is as good as those that used it say it is
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Post by km987654 on Oct 21, 2016 20:35:16 GMT -5
Im also looking to get some Ice Clear shipped to me to see if it is as good as those that used it say it is I would be interested in Ice Clear if you manage to get a supplier. |
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Post by Casethecorvetteman on Oct 21, 2016 23:26:54 GMT -5
Im also looking to get some Ice Clear shipped to me to see if it is as good as those that used it say it is I would be interested in Ice Clear if you manage to get a supplier. I was going to email you about that Keith but i cant find your email address, that would be good if you want some as well, because no bloody way i could chew through 16 litres of the stuff!! |
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Post by Casethecorvetteman on Nov 9, 2016 11:51:46 GMT -5
I have 2 gallons of Ice Clear on the way |
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