Fourier transformation and light dispersion for spectra analysis

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Fourier transformation is essential in IR and NIR spectroscopy for separating signals into individual wavelengths, while UV and Vis spectroscopy typically use gratings for light dispersion. The discussion raises questions about the cutoff wavelength in FTIR spectroscopy, noting that the spectral response is influenced by the source, beamsplitter, and detector. There is no inherent cutoff frequency in FTIR, but the lower wavelength limit is determined by the equipment used. The interchangeability of techniques for light dispersion between FTIR and Vis spectroscopy is also questioned. Overall, the conversation highlights the distinct methods and considerations in spectral analysis.
xhtp2000
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IR and NIR spectroscopy usually employ Fourier transformation to separate the signal into individual wavelength, UV and Vis spectroscopy normally apply gratings for light dispersion (into individual wavelength). What is the cutoff wavelength, and why is so?
 
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Are you referring to FTIR spectroscopy?
 
I don't think there is any inherent cutoff frequency when dealing with FTIR spectroscopy. Normally your spectral response will be determined by; A) your source. sometimes a tungsten globar or similar; B) your beamsplitter; C) your detector.


there is a lot of pertinent information here
 
Andy Resnick said:
Are you referring to FTIR spectroscopy?

Yes, for instance, FTIR uses Fourier transformation to convert the signal into individual wavelength, but Vis spectroscopy, like laser-induced breakdown spectroscopy, uses gratings to disperse the light into individual wavelength, I want to know if I can interchange this two techniques for light dispersion .
 
xhtp2000 said:
Yes, for instance, FTIR uses Fourier transformation to convert the signal into individual wavelength, but Vis spectroscopy, like laser-induced breakdown spectroscopy, uses gratings to disperse the light into individual wavelength, I want to know if I can interchange this two techniques for light dispersion .

Christopher.s' link has a nice explanation of the lower wavelength limit in FTIR machines.
 
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