- Отрасли: Chemistry
- Number of terms: 265
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Calculation performed on an interferogram to turn it into an infrared spectrum.
Industry:Chemistry
An advantage of FT-IR instrument compared to scanning/single channel dispersive instruments. It is based on the fact that in an FT-IR all the wavenumbers of light are detected at once.
Industry:Chemistry
Functions used to multiply an interferogram to reduce the amount of sidelobes in a spectrum. Different types of apodization functions include boxcar, triangle, Beer-Norton, Hanning, and Bessel. The use of apodization functions unavoidably reduces the resolution of a spectrum.
Industry:Chemistry
For an interferogram, it is the ratio of the large centerburst signal at ZOPD to the smallest recorded signal (which must be greater than the noise for any benefit from signal averaging). The A/D used must have sufficient precision to measure the entire range as any clipping or distortion of the largest signal affects the whole spectrum.
Industry:Chemistry
For an interferogram, it is the ratio of the large centerburst signal at ZOPD to the smallest recorded signal (which must be greater than the noise for any benefit from signal averaging). The A/D used must have sufficient precision to measure the entire range as any clipping or distortion of the largest signal affects the whole spectrum.
Industry:Chemistry
If frequencies above the Nyquist Frequency are not filtered out, energy in these will appear as spectral artefacts below the Nyquist Frequency. Optical and electronic anti aliasing can be used to prevent this. Sometimes the higher frequencies are said to be “folded” back so the term “folding” is used.
Industry:Chemistry
Deuterated tri-glycine sulfate pyroelectric detectors are the most common detectors used in FT-IR instruments. They are chosen for their ease of use, good sensitivity, wide spectral responsivity and excellent linearity
Industry:Chemistry
Infrared spectrometers that use a grating or prism to disperse infrared radiation into its component wavenumbers before detecting the radiation. This type of instrument was dominant before the development of FT-IR.
Industry:Chemistry
The phenomenon that takes place when infrared radiation reflects off a rough surface. The light is transmitted, absorbed, scattered, and reflected by the surface. The light approaches the surface from one direction, but the diffusely reflected light leaves the surface in all directions. A reflectance sampling technique known as DRIFTS is based on this phenomenon.
Industry:Chemistry
A phenomenon that occurs when two waves occupy the same space. Since the amplitudes of waves are additive, if the two waves are out of phase with each other, the resultant wave will be less intense than either of the individual waves.
Industry:Chemistry
