![]() It uses an optical device called an interferometer to scan through different combinations of wavelengths.Ī schematic diagram of a Michelson interferometer used for FTIR spectroscopy (source: Wikipedia) FTIR spectroscopy is a kind of IR spectroscopyįTIR stands for Fourier Transform IR. That is because there is no single combination of sources, detectors, and optics that can do it all. There is no single spectrometer that can measure the whole infrared range, from just by the visible right through to the millimeter wave region. ![]() To make a practical infrared spectrometer, you need a source of infrared light, a sensor that responds to infrared light, and an optical set up that enables you to measure how much light is falling on the detector at discrete wavelengths within the range. The principal divisions of the infrared spectrum Group vibrational modes of molecules and lattices fundamental vibrational modes. RangeĮlectronic transitions in atoms and molecules combinations and overtones of vibrational modes.įundamental vibrational modes of molecules rotational modes of gases. There are many ways this can be done, but one common classification divides infrared into near-infrared (NIR), mid-infrared (MIR), and far-infrared (FIR) parts. ![]() It is therefore an extremely wide range, spanning over three orders of magnitude in wavelength.įor practical purposes, we usually subdivide the infrared into smaller parts. Infrared light comprises everything longer in wavelength than visible red light at around 700 nanometers wavelength up to around 1 millimeter in wavelength. The electromagnetic spectrum with subdivisions of the infrared labelled ![]()
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