Selective Photodiode

[v]

Anyone know where I can obtain some selective photodiodes at 470nm(red
region) and 660nm(blue region)?.preferable from an US company.

Thanks
Vi

 

[v]

Oops...I got my color backward...470nm-blue 660nm-red

 

[Henry Kiefer]

Try using ordinary LEDs as photo diode. They have an "intregrated" color
filter because of their physical function.

- Henry

 

[GregS]

Try using ordinary LEDs as photo diode. They have an "intregrated" color
filter because of their physical function.

- Henry

Not all LED's have good in reverse voltage outputs. You could probably buy filters
from Edmund Optics to put in front of the photodiodes.

grge

 

[Brendan Gillatt]

Anyone know where I can obtain some selective photodiodes at 470nm(red
region) and 660nm(blue region)?.preferable from an US company.

Thanks
Vi

It would probably be easier to use a full spectrum photodiode and attach
different filters to the front.

Custom filters: http://www.ndc.com/tfodnarrow.aspx

Variety of different filters:
http://www.sldlighting.com/shopdisplaycategories.asp?id=10&cat=Color+Filters+/+Gels

Some more: http://cinemasupplies.stores.yahoo.net/leefilsheetc.html

 

[Joerg]

Not all LED's have good in reverse voltage outputs. You could probably buy filters
from Edmund Optics to put in front of the photodiodes.

Or use a prism with some fancy mechanical vernier and make the whole
thing tunable

 

[John Popelish]

Oops...I got my color backward...470nm-blue 660nm-red

I don't have a US manufacturer handy, but Hamamatsu makes
several series of filtered photodiodes.

i.e.
http://sales.hamamatsu.com/assets/pdf/parts_S/S9702.pdf

 

[Didi]

Or use a prism with some fancy mechanical vernier and make the whole

thing tunable

A few months back I read a posting to some analytical group how a guy
used an office scanner and a prism to do some pretty sophisticated
optical spectrum analyses... or at least was planning to, whatever,
sounds like fun either way .

Dimiter

 

[Joerg]

Hello Dimiter,

A few months back I read a posting to some analytical group how a guy
used an office scanner and a prism to do some pretty sophisticated
optical spectrum analyses... or at least was planning to, whatever,
sounds like fun either way .

Yes, you can achieve amazing results with modest means. Remember the
days when people made spectrum analyzers from parts of discarded TV
sets? I even used its own tube as a display. So I had the biggest
honking spectrum display in town. That is, until the day when the
flyback transformer went lalaland with an evil hiss and my allowance
didn't allow to order a new one :-(

 

[Homer J Simpson]

A few months back I read a posting to some analytical group how a guy
used an office scanner and a prism to do some pretty sophisticated
optical spectrum analyses... or at least was planning to, whatever,
sounds like fun either way .

ISTR people were scanning old records (LP etc?) with scanners and converting
the tracks to music.

 

[Steve Noll]

Anyone know where I can obtain some selective photodiodes at 470nm(red
region) and 660nm(blue region)?.preferable from an US company.

Thanks
Vi

This outfit has what you need for under $20 each:
http://www.intor.com/

If you have a more critical application this outfit can custom make
anything:
http://www.advancedphotonix.com/

Steve Noll | The Used Hi Tech Equipment Dealer Directory:
| http://www.big-list.com
| Peltier Information Directory:
| http://www.peltier-info.com

 

[Jerry R]

Anyone know where I can obtain some selective photodiodes at 470nm(red
region) and 660nm(blue region)?.preferable from an US company.

Thanks
Vi

These guys make them: http://www.taosinc.com/product.asp

....jerry