I have performed an experiment in which I used a spectrometer (CCS200 from Thorlabs) to measure the spectrum of a tungsten source (it was connected to the spectrometer with an optical fiber). The spectrum is shown in the figure:
I would like to know why I get that curvy spectrum, when the tungsten source should emit a spectrum that looks like a black body emission.
I have read this website about spectrometers, but it doesn't have references to check some of the things written there, and there are some things that come without explanation (for instance, symbols whose meaning are not explained). Is there any "short" (maybe up to 30 or 40 pages) text or chapter or source where the working of a spectrometer is explained with a bit of detail so that I could explain the curviness of my spectrum?