Abstract
An interferometric technique for measuring the spectral slit width of i.r. spectrophotometers has been described. This method involves the evaluation of the visibility of the interferences of a Fabry-Perot interferometer observed in the spectrophotometer. The reflexion of the interferometer plates approximates to R = 0.41. The profile of the slit function is assumed to be the Gauss curve. However, measuring conditions can be given, for which the measurement result is rather independent of this assumption.
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