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jgraham
Postmaster
Reged: 12/02/04
Posts: 6747
Loc: Dayton, Ohio
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Re: It works! - CaK fluorescent eyepeice..
05/05/06 09:18 AM
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Silly thought...
...project the UV image onto a phosphorescent screen, view the screen with an eyepiece.
Silly thought part II...
...make the screen really thin (a frosted window) and view from the back.
This is what you're essentially doing by trying to make a thin phosphorescent 'filter' and placing it at the object field of the eyepiece.
If you have access to a photochemistry handbook (or better yet a fluorescent/phosphorescent spectrometer) you might look up tables of singlet and triplet energies; these are often listed in terms of wavelength. The ideal material with have a singlet energy of 395nm and a triplet energy somewhere in the visible. Alternatively, if you can dig up the UV absorption spectrum of a material it's phosphorescent emission spectrum will be a mirror image of the absorption spectrum reflected around the first absorption peak (which marks the singlet energy). I had one of these spectrometers a few years ago, but we scavenged parts off of it to make a Raman spectrometer.
...or you can hunt around and find a material that works 
Ralph; I was a member of the MVAS for many years (going back to about 1976), but I haven't been around in a while, their dues got very expensive and I've been busy with night school for the past 6 or 7 years. I will finish school this year and I plan to re-join the club once I have a chance to decompress.
-John
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-John
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Homebuilt scopes from 4.25-16.5"
Meade LXD75-N6/SN6/SC8, DSX-90, ETX-60BB, ETX-125PE, DS-2130
Orion StarBlast, BinoViewers, Coronado PST
Rebel XT/XTi, DSI Pro (I, II, & III), DSI, LPI, Electronic Eyepiece, Phillips SPC900NC
Tasco 60mm Refractors
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