What is the wavelength of NIR?
Near-infrared light generally refers to light within the wavenumber range of 12,500 to 4,000 cm-1 (wavelengths from 800 to 2,500 nm) (see Fig.
What is the difference between FTIR and NIR?
An FTIR spectrometer must have a moving part (a moving mirror) whereas a nir spectrometer with an array detector could record all the dispersed wavelengths simultaneously without the use of any moving parts. The cost of a hand-held FTIR spectrometer can be two to three times higher than a handheld nir spectrometer.
What does NIR spectroscopy measure?
A NIR spectrometer measures overtones and combination tones of molecular vibrations in the infrared range, and especially, the asymmetric vibrations which are intensive in the near infrared range, i.e. stretch vibrations involving hydrogen bonds (e.g. C-H, O-H and N-H).
Can NIR spectroscopy used for qualitative analysis?
1.1 Application of NIR Spectroscopy in Qualitative Analysis By using pattern recognition algorithms, NIRS can provide a qualitative assessment of a process sample to ensure that its NIR spectrum is within an acceptable range of variability for what is considered a Page 20 3 good quality product.
Which of the following is infrared wavelength?
Definition and relationship to the electromagnetic spectrum
| Name | Wavelength | Frequency (Hz) |
|---|---|---|
| Ultraviolet | 10 nm – 400 nm | 750 THz – 30 PHz |
| Visible | 400 nm – 700 nm | 430 THz – 750 THz |
| Infrared | 700 nm – 1 mm | 300 GHz – 430 THz |
| Microwave | 1 mm – 1 meter | 300 MHz – 300 GHz |
How is infrared wavelength measured?
The optical system of an infrared thermometer captures the energy emitted from a circular measuring spot and focuses it onto a detector. A material with a high transmission factor is used for the lenses. The energy captured by the detector is electronically amplified and converted into an electrical signal.
How does NIR spectroscopy work?
In NIR spectroscopy, the unknown substance is illuminated with a broad-spectrum (many wavelengths or frequencies) of near infrared light, which can be absorbed, transmitted, reflected or scattered by the sample of interest. The illumination is typically in the wavelength range of 0.8 to 2.5 microns (800 to 2500nm).
What is the use of FTIR?
FTIR spectroscopy is used to quickly and definitively identify compounds such as compounded plastics, blends, fillers, paints, rubbers, coatings, resins, and adhesives. It can be applied across all phases of the product lifecycle including design, manufacture, and failure analysis.
What is the NIR region?
NIR is a region of the electromagnetic spectrum that has unique properties which make it very useful for characterizing materials. The NIR region is from 700 to 2500 nm. This area of the electromagnetic spectrum has the best combination of attributes for the analysis of most solid, slurry and liquid samples.
What NIR stands for?
Near Infrared (NIR) analysis is a spectroscopic technique that makes use of the naturally occurring electromagnetic spectrum.
What is infrared wavelength in CM?
The infrared range covers 700-1000 nm (wavelength), or 14,286-12,800 cm-1 (wavenumber), and ultraviolet radiation has wavenumbers above these, approximately, 25,000 – 50,000 cm-1, or 100 to 400 nm (wavelength).
What colors are infrared?
Near infrared wavelengths become visible as red while red wavelengths appear as green and green as blue. Blue wavelengths are shifted out of the visible portion of the spectrum and so they appear as black.
Which is an example of a NIR wavelength range?
For both methods, the NIR wavelength range is an important consideration. For instance, a Short Wave NIR range (850 – 1050nm) gives good sample penetration with NIR transmission. An infrared spectrum can be obtained by passing infrared light through a sample (transmission) or the light can be reflected from the sample (reflectance).
What are the advantages of using NIR technology?
The overall advantages of using NIR analysis is that it provides rapid analysis data for better decision making in food and agri production processes. Compared to traditional analysis methods it requires little or no sample preparation and no chemicals or consumables.
What’s the difference between FTIR and NIR spectroscopy?
The main difference is that FTIR works across longer wavelengths. Additionally, many special optical components and materials are used with FTIR. The benefit of the longer wavelengths is that more specific chemical information is typically obtained from the samples.
When to use short wave NIR for grain analysis?
Alternatively, when using NIR transmis¬sion for measuring inhomogeneous samples such as grain, it is an advantage to use the Short Wave NIR range (850 – 1050nm) where the light penetration is good and the premium signal to noise ratio offered by a scanning grating monochromator is essential.