IRPrestige-21 NIR System
Fourier Transform Infrared Spectrophotometer

The IRPrestige-21 NIR system enables measurements ranging from the near infrared to mid-infrared regions.
For near infrared measurements, it uses a CaF₂ (calcium fluoride) beam splitter, InGaAs (indium gallium arsenide) detector, and tungsten light source. When the beam splitter is replaced with a CaF₂ beam splitter, the system recognizes the type of beam splitter and automatically sets the appropriate measurement parameters.

Because molecular vibration-based absorption appears in the near infrared region, substances can be identified by comparing spectral patterns and quantitated from peak intensity. In addition, since absorption intensity in this region is not as high as in the mid-infrared region, many samples can be measured as-is, without dilution, which allows for more rapid analysis.
The IRPrestige-21 NIR system is especially well suited to pattern comparison, because the Fourier transform method provides such high wavelength precision. If the sample container is made of thin plastic or glass, samples can be left in the container for measurements. Also, using a fiber probe allows measuring samples without having to place the samples in the sample chamber or an accessory.

FT-NIR can be used for a wide variety applications, such as for acceptance testing when receiving raw materials or before shipping products, or for monitoring in reaction or mixing processes.

	Petroleum / Fuel	Octane number, aromatic components, or olefin number
	Foods / Beverages	Moisture, protein, fat, sugar, or alcohol content
	Fibers	Fiber type, moisture content, or oil content
	Chemistry / Polymers	Polymerization level, residual monomer content, hydroxyl group content, blend ratio, or moisture content
	Pharmaceuticals	Main ingredients, additives, moisture content, or raw material acceptance testing
	Pulp / Paper	Surface coatings or moisture content

This probe uses a near infrared optical fiber to enable measuring samples without placing them in a sample chamber or accessory. The probe measures samples by irradiating them with near infrared light emitted from the probe head and collecting the reflected light. This eliminates the need for pretreatment procedures, such as dilution with KBr. Powder samples can be measured by inserting the probe directly into the sample or they can be measured left in a plastic bag or glass bottle.

Enables measuring powder samples on a sample stage. This eliminates the need for pretreatment procedures, such as dilution with KBr. Powder samples can also be measured contained in a plastic bag or glass bottle.

Enables placing powder samples, pellets, liquids, or molded items on a sample stage for measurement (reflectance measurement). This eliminates the need for pretreatment procedures, such as dilution with KBr. Samples can be measured left in powder form, contained in a plastic bag or glass bottle.

Enables measuring transmission through liquid samples while they are heated or held at a constant temperature. This is used for multi-component quantitative analysis of liquid samples or to track any reactions or changes in samples when they are heated.

The near infrared region is considered the range from the long wavelength end of the visible light spectrum up to the mid-infrared region. In terms of wavelengths, this normally means from 800 nm to 2500 nm (12,500 to 4000 cm^-1). Absorption that appears in the near infrared region is based on molecular vibration, just as it is for the fundamental molecular vibrations in the mid-infrared region, but the vibrations are overtones or combinations of the fundamental vibrations. Spectra in the mid-infrared region are referred to as infrared spectra and provide information about the functional groups in organic substances. Spectra in the near infrared region also reveal information about the functional groups in organic substances as well. Therefore, substances can be qualified from a comparison of the overall spectral patterns. In addition, it enables quantitation from peak intensities.