Abstract
For strongly absorbing bands measured with a Fourier transform infrared (FT-IR) spectrometer, the effects of a nonlinear detector response must be eliminated before Beer’s law linearity can be achieved. The effect of the non-linear response of mercury cadmium telluride (MCT) detectors has been evaluated on three commercial FT-IR spectrometers. The greater the photon flux, photon flux density, and the smaller the area of the detector on which the source image is focused, the greater are the effects of the nonlinearity. Detector nonlinearity is manifested by the generation of nonlinear Beer’s law plots. A simple correction algorithm has been applied to Beer’s law data acquired using both photoconductive MCT and pyroelectric detectors and found to work well.
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