What are the most temperature stable photo detector? I simply need to detect the magnitude of visible light. The temperature of the detector and emitter will change by ~20c. I might be worrying about nothing, but I would like to make wise choices, in case this proves a hurdle towards calibration.
http://en.wikipedia.org/wiki/Photodetector Wiki has a bunch of them.
At first thought I would think to use two LEDs.
As for the emitter,
I don't need much light, a single dim LED is enough.
Making a temperature stable current source to put energy into something is easy enough, but what should that something be?
some kind of light bulb? LED? Perhaps a particular kind of LED?
This is for detecting a change in light conductance through a sample (like a photo spectrometer)
Is there something like two LED's on a common substrate? I would imagine the detection capability of one LED would scale with the emission capability of the other LED over temperature, ? I could use fiber optics to route light in this case. (or its still non linear even if they were made at the same time on the same substrate? )
I guess i can over nize it if no near solution exists, but that is pretty ugly.
*wave length is not critical. So long it is visible light.