I'm looking for suggestions for commonly available (like from Home Depot) and inexpensive lamps that can be used as a standard calibration source for an inexpensive, low resolution, slit-less spectrometer. Ideally the lamp would be small (like an LED) and easy to wire up to a 9 volt battery (preferred) or 110 VAC.
We need this lamp so students can do two types of calibration:
I don't need a high degree of accuracy. Students will be capturing spectra and determining their approximate color temperature.
I've thought about using the flashlight (torch) on an iPhone, since they're, um, pretty common.
I know that some lamps change in SPD over time, but I don't know to what degree this is the case with a cell phone or other possible standard lamp.
Any suggestions on lamps?
While researching this a few years ago, I found a site (GE?) that provided SPD graphs for a wide range lamps. I am unable to find this site again. The graph below (from another thread on this board) looks like it is from that site.
This is the kind of graph and standard lamp I'm looking for. I can smooth the features for #1 above. And it has some features with a known wavelength.
We need this lamp so students can do two types of calibration:
- Relative flux calibration (to remove non-linear instrument sensitivity across wavelengths) : The light source needs to have a visible continuum rather than just a few broad emission features.
- Wavelength calibration: The light source needs to have one fairly defined emission feature.
I don't need a high degree of accuracy. Students will be capturing spectra and determining their approximate color temperature.
I've thought about using the flashlight (torch) on an iPhone, since they're, um, pretty common.
I know that some lamps change in SPD over time, but I don't know to what degree this is the case with a cell phone or other possible standard lamp.
Any suggestions on lamps?
While researching this a few years ago, I found a site (GE?) that provided SPD graphs for a wide range lamps. I am unable to find this site again. The graph below (from another thread on this board) looks like it is from that site.
This is the kind of graph and standard lamp I'm looking for. I can smooth the features for #1 above. And it has some features with a known wavelength.