Re: [time-nuts] LED Spectra mentioned in time-nuts Digest, Vol 66, Issue 164
OK. I'll look for the guy's contac info, but it might take a day or two. -John === > J. Forster wrote: > >> 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. > > I work with a fellow who makes custom gas discharge lamps (you need a > spectra, he makes the light!) and we bought an OO from the company. > About $2k. I'd LOVE to have a second one so yes, please post the name > of the guy who had those. > > John > > -- > John DeArmond > Tellico Plains, Occupied TN > http://www.neon-john.com<-- email from here > http://www.johndearmond.com <-- Best damned Blog on the net > PGP key: wwwkeys.pgp.net: BCB68D77 > > ___ > time-nuts mailing list -- time-nuts@febo.com > To unsubscribe, go to > https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts > and follow the instructions there. > > ___ time-nuts mailing list -- time-nuts@febo.com To unsubscribe, go to https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts and follow the instructions there.
Re: [time-nuts] LED Spectra mentioned in time-nuts Digest, Vol 66, Issue 164
J. Forster wrote: > 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. I work with a fellow who makes custom gas discharge lamps (you need a spectra, he makes the light!) and we bought an OO from the company. About $2k. I'd LOVE to have a second one so yes, please post the name of the guy who had those. John -- John DeArmond Tellico Plains, Occupied TN http://www.neon-john.com<-- email from here http://www.johndearmond.com <-- Best damned Blog on the net PGP key: wwwkeys.pgp.net: BCB68D77 ___ time-nuts mailing list -- time-nuts@febo.com To unsubscribe, go to https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts and follow the instructions there.
Re: [time-nuts] LED Spectra mentioned in time-nuts Digest, Vol 66, Issue 164
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 > > > > > ___ > time-nuts mailing list -- time-nuts@febo.com > To unsubscribe, go to > https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts > and follow the instructions there. > > ___ time-nuts mailing list -- time-nuts@febo.com To unsubscribe, go to https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts and follow the instructions there.
Re: [time-nuts] LED Spectra mentioned in time-nuts Digest, Vol 66, Issue 164
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. I too would like to know more about the tool used to create those plots. What I use is a 'manual' direct vision spectrophotometer which I bought from Surplus Shed: http://www.surplusshed.com/pages/item/i1479d.html for $49 you can't really go wrong...however, when I have a bit of spare coin I plan on buying a better one: http://www.surplusshed.com/pages/item/l3524.html You see, the $93 one actually has a scale in it, the cheap one does not! They also sell much higher grade ones for $200-400 that do a good deal more (angle measurements etc). But nothing that attaches to a computer for pretty plots. So I'm intrigued as well. Tom Frank, KA2CDK ___ time-nuts mailing list -- time-nuts@febo.com To unsubscribe, go to https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts and follow the instructions there.
[time-nuts] LED Spectra mentioned in time-nuts Digest, Vol 66, Issue 164
> >> 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 ___ time-nuts mailing list -- time-nuts@febo.com To unsubscribe, go to https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts and follow the instructions there.
