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FTIR redirects here. FTIR may also refer to Frustrated total internal reflection. Fourier transform infrared spectroscopy (FTIR) is a technique which is used to obtain an infrared spectrum of absorption, emission, photoconductivity or Raman scattering of a solid, liquid or gas.n a Michelson interferometer adapted for FTIR, light from the polychromatic infrared source, approximately a black-body radiator, is collimated and directed to a beam splitter. Ideally 50% of the light is refracted towards the fixed mirror and 50% is transmitted towards the moving mirror.
2 INTRODUCTION What is FT-IR? FT-IR stands for Fourier Transform InfraRed, the preferred method of infrared spectroscopy. Ininfrared spectroscopy, IR radiation is passed through a sample. Some of the infrared radiation isabsorbed by the sample andsome of it is passed through(transmitted).The resultingspectrum represents the molecularabsorption and transmission,creating a molecular ï¬ngerprintof the sample. It can identify unknown materialsâ¢ It can determine the quality or consistency of a sampleâ¢ It can determine the amount of components in a mixtureThis booklet is an introduction to the concepts behind FT-IR spectroscopy.