Here you go. I hope you get something out of the poor pictures. The camera does heavy autocompensate which i cannot disable. The pictures are more bright then what i see. KD dropin eyestimated at around 370nm wavelength.
Have fun with those.
Probably looking for a result like this:
Be sure to not do tests like this: XD
I might try that, you know! Maybe I'll find something interesting :)
Is what you see with your eyes similar to these photos: http://www.bundesbank.de/bargeld/bargeld_banknoten_sicherheitsmerkmale.en.php#fluoreszierende ?
Do you see all the details? I can't really tell from your photos...
Not at all. Those pictures are way different. My pictures are very close to what i see but a bit overexposed. On my monitor at least. Eye calibrated to fit my reading needs.
<- this is way different than my dropin.
I will check wit the DX dropin when i get it back, probably today. Stay tuned. It should be of higher wavelength.
If you get bored try this.
KD sell at least three differents UV droppin , some as dropin some in host , ordering a dropin chances are they deliver whichever have at hand, as usual...they listed the RC-G2 in grey only and sent the black one.
Out of curiosity I'll order this one...
I think the problem there is that the flashlight is also producing quite a lot of visible light, I think I've seen filters that will block all visible light but not the UV...I just can't think where.
If you manage to find it please post it.
Found it!
Now to find a supplier then a meditation to find a way to make it 29mm round lens...
Finding a UV only transmitting lens is harder than i tought...
And is likely to be hugely expensive. Certainly the short wave UV bulbs used in one spectrometer I came across cost about the same as a decent used car. The device was worth about the same as 4 3 bedroom houses at the time.
www.ir-uv.com will sell you one, but they very carefully don’t have any prices on their website. If you have to ask…
This may be of some use
B+W a German company (6550 Bad Kreuznech, Postfach 2463, Germany) - a division of the Schneider Optics empire, supplies an ultraviolet transmission filter (code number 403) with a very similar transmission curve to the Wratten 18A, at a much lower price (Figure 27). Precision Optical Ltd in England (425 Stratford Road, Shirley, Solihull, West Midlands, B90 4AE, UK), supply Schott, UGI, UG5 and UG11 filters (which are the equivalent of the old Chance Pilkington OX1, OX5 and OX7). The curves for these are shown in Figures 28, 29, and 30). Oriel Scientific in USA (250 Long Beach Blvd, PO Box 872, Stratford, CT 06497, USA), supply interference filters for ultraviolet in 10, 20, 50 and 100nm wavebands throughout the ultraviolet spectrum. (Dye absorption filters are only applicable down to 310nm; interference type filters made of quartz or silica must be used below this wavelength). Tiffen - the major supplier of photographic filters in the USA supply an equivalent to the Wratten 18A in a wide range of sizes to fit common lens filter threads. The Rolyn Optics Company (706 Arrowgrand Circle, Covina, California 91722, USA) supply UG1, UG5 and UG11 filters in various sized glass squares. The Hoya U-330/340/360 is another equivalent.
The Baader U2 will also do what you want. At a very high price.
http://www.baader-planetarium.de/sektion/s43c/s43c.htm
I think you want the 2458292 which is 31mm in diameter. And 175 euros!
http://www.baader-planetarium.de/sektion/baa-zub_sektion_eng.pdf
Page 15, section 44
More info here - but all are scary money
http://www.naturfotograf.com/UV_IR_rev04.html
Thanks for the info but im staying away from that for now.
This one is not terribly expensive and the size should fit most flashlights: http://www.bhphotovideo.com/c/product/94769-REG/B_W_48mm_UV_Black.html
But it's only for 320-385nm, so may not fit some emitters.
(I'm probably not gonna buy it)
http://www.bhphotovideo.com/c/product/189949-REG/Rosco_120336507508_Permacolor_UV_Woods.html
Don't even dare to try to look for postage...
Now if i can find an UV incandescent bulb...
Perhaps... http://cgi.ebay.com/6-BLACKLIGHT-UV-LIGHT-BULBS-75-Watts-NEW-/110646340856?pt=LH_DefaultDomain_0&hash=item19c3092cf8
If that image is correct, the bulb will produce almost no UV at all. Check the emission spectrum for tungsten. There is little UV to be had.
http://ioannis.virtualcomposer2000.com/spectroscope/elements.html
about 2/3 of the way down the page.
Or check the black-body temperature necessary to emit it's peak output in the UV =
Having tried to remember the formulae and work it out, I did what everyone else does and googled it - we need about 36,000Kelvin Tungsten melts about 32,500 degrees before that. If you increase the pressure enough, you can stop it from melting.
But if you could increase pressures that much, making monster diamonds would be easy. And a lot more profitable.
You need plasmas to get UV in quantity - i.e., your typical fluorescent tube.
Actually i wanted the tungsten bulb just to "borrow" the shell to make a UV pass only filter. The bulb should be made from the so called wood's glass.
Bulb glass is very thin - be careful. I doubt it is even close to wood's glass, just plain soda-lime glass, maybe borosilicate, dyed purple.
For the price it is worth a try though.
I hear ya. I share the same doubt.
Oooh, Kaidomain finally answered: "The wavelength for S001434, S008201, S009369 are all 395nm."
Perhaps...
But my samples S008201 doesen't look like 395nm if i judge the taschenlampe test. More in line with 375-380nm.
Can anyone recommend a UV flashlight that is REALLY cheap? Preferable under $5?
You can get some UV keychain lights at bestinone.net .
I still haven't received mine, but I'll post some photos when I do.
DX has several. But DX seems to be having issues just now - can't get through to their website. They do a not very bright single AA one for around $2.
I can't seem to find it on the dealextreme website, can you provide a link? Theres a AAA one that seems to be out of stock. I don't want anything fancy... just something cheap to run some GITD tests on.