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- aa2c39cf-1c4c-437e-ae2d-29e6a77f1aa2 definition "FTIR SPECTROMETER - Fourier Transform Infrared Spectrometer Traditional (dispersive) infrared techniques experience difficulties due to the '1 wavenumber at a time' nature of data acquisition. This leads to either a poor signal to noise ratio in a spectrum or a very long time needed to obtain a high quality spectrum. Both these situations cause problems with kinetic work. The first gives inherent large errors, the second prohibits in-situ work. These problems can be overcome using Fourier transform infrared spectroscopy (FT-IR) that is based on the interferometer originally designed by Michelson and a mathematical procedure developed by Fourier that converts response from the 'time' to the 'frequency' domain. In the Michelson interferometer a parallel, polychromatic beam of radiation from a source (A) is directed to a beam splitter (B), made from an infrared transparent material, such as KBr. The beam splitter reflects approximately half of the light to a mirror, known as the fixed mirror (C), which in turn reflects the light back to the beam splitter. The rest of the light passes through to a mirror, moving continuously, at a known velocity, back and forth along the direction of the incoming light and this is known as the moving mirror (D). Upon reflection from the moving mirror, radiation is then directed back to the beam splitter. At the beam splitter some of the light that has been reflected from the fixed mirror combines with light reflected from the moving mirror and is directed towards the sample. After passing through the sample (E) the radiation is focused onto the detector (F). The detectors are sufficiently fast to cope with time domain signal changes from the modulatio n in the interferometer. Additional information available at http://physics.nist.gov/Divisions/Div842/Gp1/fts_intro.html" @default.
- aa2c39cf-1c4c-437e-ae2d-29e6a77f1aa2 id "1655273" @default.
- aa2c39cf-1c4c-437e-ae2d-29e6a77f1aa2 path_id 055a79c7-61db-4250-abad-f1e09909f14c @default.
- aa2c39cf-1c4c-437e-ae2d-29e6a77f1aa2 path_id 2e38423f-a5e6-411a-88d3-8fdc00aaf30a @default.
- aa2c39cf-1c4c-437e-ae2d-29e6a77f1aa2 path_id 4f81c61c-f100-4bc4-9664-d9b70d2f162f @default.
- aa2c39cf-1c4c-437e-ae2d-29e6a77f1aa2 path_id 6015ef7b-f3bd-49e1-9193-cc23db566b69 @default.
- aa2c39cf-1c4c-437e-ae2d-29e6a77f1aa2 path_id b2140059-b3ca-415c-b0a7-3e142783ffe8 @default.
- aa2c39cf-1c4c-437e-ae2d-29e6a77f1aa2 path_label "Earth Remote Sensing Instruments" @default.
- aa2c39cf-1c4c-437e-ae2d-29e6a77f1aa2 path_label "Instruments" @default.
- aa2c39cf-1c4c-437e-ae2d-29e6a77f1aa2 path_label "Passive Remote Sensing" @default.
- aa2c39cf-1c4c-437e-ae2d-29e6a77f1aa2 path_label "Spectrometers" @default.
- aa2c39cf-1c4c-437e-ae2d-29e6a77f1aa2 path_label "Spectrometers/Radiometers" @default.
- aa2c39cf-1c4c-437e-ae2d-29e6a77f1aa2 prefLabel "FTIR SPECTROMETER" @default.
- aa2c39cf-1c4c-437e-ae2d-29e6a77f1aa2 reference "" @default.
- aa2c39cf-1c4c-437e-ae2d-29e6a77f1aa2 tag "Instruments" @default.