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Science Forum Index » Electronics Forum » using a UV led as a detector
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| Peter Lynch |
 Posted: Fri Aug 31, 2007 6:33 pm |
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Guest
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The plan is to build some sort of meter for measuring the UV light
from the sun. Now I'm not talking about UV-indexes or any sort of
medical/lab-quality measurements, just a hobby level goofing around
project.
I know that a normal LED can be used "backwards" as a detector, so
one option I'm considering is to use an ultraviolet LED, with emmissions
around 395 nm as the detector. I realise it will probably detect
normal light too, but hopefuly with a bit of experimentation using LEDs
of different colours I can take this into account.
Has anyone got any experience of this kind of thing and in particular
will a uv LED actually detect at long-uv wavelengths?
Pete
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.. never trust a man who, when left alone ...... Pete Lynch .
.. in a room with a tea cosy ...... Marlow, England .
.. doesn't try it on (Billy Connolly) ..................................... |
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| Vladimir Dergachev |
| Posted: Sun Oct 07, 2007 1:03 am |
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Guest
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Peter Lynch wrote:
Quote: The plan is to build some sort of meter for measuring the UV light
from the sun. Now I'm not talking about UV-indexes or any sort of
medical/lab-quality measurements, just a hobby level goofing around
project.
I know that a normal LED can be used "backwards" as a detector, so
one option I'm considering is to use an ultraviolet LED, with emmissions
around 395 nm as the detector. I realise it will probably detect
normal light too, but hopefuly with a bit of experimentation using LEDs
of different colours I can take this into account.
Has anyone got any experience of this kind of thing and in particular
will a uv LED actually detect at long-uv wavelengths?
I am not certain about that - myself, I would try using UV-sensitive
photodiode (they do make them).
I would also suggest getting two of the devices, hooking to the opposite
ends of a differential amplifier and blocking one with glass (which filters
UV).
best
Vladimir Dergachev
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