Basics: Fourier Transform Spectrometry
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چکیده
A FT spectrometer is an interferometer. Its historical and most widely known configuration is the Michelson interferometer, shown on Fig. 1. A beam-splitter is used for dividing the light to be spectrally analyzed into two beams. After they have been reflected on two distinct mirrors, the two beams are recombined by the same beam-splitter and sent to a detector. One of the mirrors is fixed, while the other is a movable mirror. When the fixed and the movable mirrors are equidistant from the beam splitter (d=0) both beams travel the same distance before reaching the detector. However, if the movable mirror moved away, one of the light beams has to travel an additional distance δ = 2d (back and forth) called retardation, or optical path difference.
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