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Terms
  • Fourier transform (FT) Any of the various methods of decomposing a signal into a set of coefficients of orthogonal waveforms (trigonometric functions).
  • Fourier transform spectrometer An instrument using a Michelson interferometer, a beamsplitter, two plane mirrors and a detector to give Fourier analysis of the detector signal to provide the desired spectrum.  
  • infrared (IR) The invisible portion of the electromagnetic spectrum that lies between about 0.75 and 1000 µm. Radiation in the near-infrared produces a sensation of heat.
  • spectrometer A kind of spectrograph in which some form of detector, other than a photographic film, is used to measure the distribution of radiation in a particular wavelength region.  
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