[time-nuts] LED Spectra mentioned in time-nuts Digest, Vol 66, Issue 164

[J. Forster]

The Spectrometer I used is an Ocean Optics HR2000. It's a small box about
2" x 4" x 6" and has a FO input and a USB connection. It is powered from
my laptop via the USB port.

I bought mine at an MIT Flea Market last summer. The SW is available from
the manufacturer.

I don't recall what I paid, but it was certainly less than $250. If
anybody is interested in one, I still have the seller's contact
information. He may still have them.

I believe these particular units came from a biomedical analyzer of some
sort. The gratings (hence the dispersion) can be changed at the factory,
but it costs something like $500 last seen.

Best,
-John

==============



>  >
>  >> J. Forster wrote:
>  >>> Attached is a spectrum of a "white" LED Flashlight. My diode
> spectrometer
>  >>> does not go further than the limits shown.
>
>
> While this may be stretching the limits of time-nuts...
>
> I think I saw a question asking what was used to measure the recently
> posted LED spectra but other than a passing comment about a diode
> spectrometer, if there was an answer I can't find it.
>
> I'm curious to know a little more about what was used to measure the LED
> spectra.  Not familiar with a "diode spectrometer" and Google is not
> being very helpful.  The last time I measured optical spectra was a long
> long time ago using a PE UV/Visible spectrophotometer in the early days
> of semiconductor manufacturing - used it to measure dielectric thickness
> (on 1 inch and eventually 2 inch wafers).  I'm interested in looking at
> the spectra of CF lamps - something which may not be realistic since we
> retired folks no longer have access to the fun (and expensive) lab
> equipment we used in our pre-retirement days.
>
> JoeC
>
>
>
>
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