|
Hi Jeff,
thanks for the calculations; never seen it before.
My set up is a little different from yours: I mounted a 12V down light on an optical bench and varied the voltage, taking readings from that. Yours is probably a cleaner reading, as I made no attempt at shielding the spectrometer from ambient light sources. The intensity of the light was such that I kept having to reduce it either by varying the distance to the spectroscope (the fibre optic feed, that is) or using a diaphragm to stop the signal being saturated. It didn't seem to make that much difference to the shapes of the curves as the light was so bright. We seem to be using the same spectroscope.
I looked at both your curves and mine and they seem to match well. Your absorption features and mine seem roughly the same, suggesting a common glass composition? (I'm new to this game.) In my curves, I adjusted all three sets so they were the same amplitude, allowing me to look at the shape of the curve more easily.
What are your thoughts?
Incidentally, where do you teach? I'm at Melrose High in Canberra.
Cheers,
Geoff Mc
|