Ge/KBr beamsplitters

Figure 17.1. Instiument response function obtained by calculating the ratio of the spectrum of a blackbody at 200 C measured on a Digilab FTS-14 spectrometer with a Ge/KBr beamsplitter to the calculated spectral energy density of a blackbody at the same temperature.

As expected from the above description, the simplest way to find the response flaw of a detector is to examine the 400-0 cm region of the measured spectrum, where no spectrum should exist in the case of an FT-IR spectrometer with a Ge/KBr beamsplitter. As for the issue of the detector response, see also Section 3.6.2. 

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