Editing Spectroradiometer (section)

== DIY builds ==
It is possible to build a basic optical spectrometer using an optical disc grating and a basic webcam, using a CFL lamp for calibrating the wavelengths.<ref>{{cite magazine |title=DIY Spectrometer |url=https://www.wired.com/2012/07/diy-spectrometer/ |magazine=Wired |language=en-us}}</ref> A calibration using a source of known spectrum can then turn the spectrometer into a spectroradiometer by interpreting the brightness of photo pixels.<ref>{{cite web |title=PLab 3 Gain Correction |url=https://publiclab.org/notes/stoft/03-06-2015/plab-3-gain-correction |website=[[Public Lab]]}}</ref> A DIY build is affected by some extra error sources in the photo-to-value conversion: photographic noise (requiring [[dark frame subtraction]]) and non-linearity in the CCD-to-photograph conversion (possibly solved by a [[raw image format]]).<ref>{{cite web |title=Noise Reduction |url=https://jethomson.wordpress.com/spectrometer-articles/noise-reduction/ |website=Jonathan Thomson's web journal |language=en |date=26 October 2010}}</ref>