Incandescent lamps as UV source, an attempt

[baffe]

Yes john, the Mt12 works well down to 350 nm. Resolution and accuracy aren'nt very big but sufficient for me.

 

Just to rate modified and homemade flash units for uv. Or to perform quick and brief check for transmission of filters.

 

Colin I use cheap noname tungsten halogen bulbs, not one of the big brands...

 

(From mobile)

[JCDowdy]

Do you know where to get 'quartz' halogen lamps, that don't attenuate any UV ?

 

For a start you can look for the ones with the UV safety warnings.

Also you can look for light fixtures that have clear glass filters that are actually marked as UV filters. Many inexpensive halogen shop lights have this type of filter. The main problem of course is that they produce an immense amount of visible light and heat relative to the UV. They are very difficult to filter and will thermally crack filters of any appreciable optical density. The grill on the front is clearly indicative of significant thermal hazard.

[colinbm]

Thanks for the reminder about these lamps, John.

Col

[Johan]

Ever considered this sort of test on a mercury vapour lamp? They do produce UV (I have one in a mothtrap), but they also produce huge amounts of visible light.

[baffe]

But they show only the usual mercury lines...

[baffe]

Here is the spectrum of my low pressure mercury lamp:

 

http://up.picr.de/22618971um.jpg

 

The fiber, accuracy and resolution of the instrument are not very good. But it is visible that the spectrum is not continous.

[Johan]

Yeah sorry, hadn't read your first post carefully, didn't see that spectrum was such a requirement.