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Unformatted text preview: Fourier Transform Infrared Spectrometer 6 A Fourier Transform InfraRed (FTIR) spectrometer is based on a Michelson in- terferometer. An FTIR spectrometer is capable of determining the spectral content of a light source. This is accomplished by scanning one of the mirrors of the Michelson in- terferometer and recording the output interferogram as a function of the optical path difference between the two interfering beams. In an FTIR, the wavelength of a wave is typically represented by its wavenumber v where v = 1 λ , and λ is the freespace wavelength. A particular optical source emits a hypothetical expo- nential spectrum. To obtain the interferogram, the spectrum may be considered to be an even function centered at k = 0. The spectrum is represented by B ( k ) = e-| 2 k/ Δ k | where k is the wavevector magnitude ( k = 2 π/λ = 2 π v ) and Δ k is the wavevector bandwidth. This spectrum is shown below....
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This note was uploaded on 04/29/2008 for the course ECE 4500 taught by Professor Gaylord during the Spring '08 term at Georgia Tech.
- Spring '08