Near-infrared Spectroscopy

What is Near-infrared Spectroscopy?

Near-infrared spectroscopy (NIRS) is a spectroscopic method that uses the near-infrared region of the electromagnetic spectrum (from 780 nm to 2500 nm). Typical applications include medical and physiological diagnostics and research including blood sugar, pulse oximetry, functional neuroimaging, sports medicine, elite sports training, ergonomics, rehabilitation, neonatal research, brain computer interface, urology (bladder contraction), and neurology (neurovascular coupling). There are also applications in other areas as well such as pharmaceutical, food and agrochemical quality control, atmospheric chemistry, combustion research and knowledge.

Near-infrared Spectroscopy-3

Features of Near-infrared Spectroscopy

  1. Suitable for a wide range of sample types, such as granules, flakes, powders, pastes, moisture, crude fat, crude protein, crude fiber, crude ash etc.
  2. Fast analysis, results within 3/10/30 seconds.
  3. Easy operation: no special training, no sample pretreatment, no sample destruction.
  4. Software applicable to different management permissions.
  5. Reliable results – for most analyses, NIR instruments have a prediction accuracy within 1.5 times of the reference method error with much better precision.
  6. Cost effective – one analyst can typically analyze several hundred samples in a day with no consumable costs.

Applications of Near-infrared Spectroscopy

Typical applications of NIR spectroscopy include the analysis of food, pharmaceuticals, petrochemical, combustion products, and a major branch of astronomical spectroscopy.

Applications of Near-infrared Spectroscopy

1. Astronomical Spectroscopy

Near-infrared spectroscopy is used in astronomy for studying the atmospheres of cool stars where molecules can form. The vibrational and rotational signatures of molecules such as titanium oxide, cyanide, and carbon monoxide can be seen in this wavelength range and can give a clue towards the star’s spectral type. It is also used for studying molecules in other astronomical contexts, such as in molecular clouds where new stars are formed. The astronomical phenomenon known as reddening means that near-infrared wavelengths are less affected by dust in the interstellar medium, such that regions inaccessible by optical spectroscopy can be studied in the near-infrared. Since dust and gas are strongly associated, these dusty regions are exactly those where infrared spectroscopy is most useful.

2. Agriculture

Near-infrared spectroscopy is widely applied in agriculture for determining the quality of forages, grains, and grain products, oilseeds, coffee, tea, spices, fruits, vegetables, sugarcane, beverages, fats, and oils, dairy products, eggs, meat, and other agricultural products. It is widely used to quantify the composition of agricultural products because it meets the criteria of being accurate, reliable, rapid, non-destructive, and inexpensive. Abeni and Bergoglio 2001 apply NIRS to chicken breeding as the assay method for characteristics of fat composition.

3. Materials Science

Techniques have been developed for NIR spectroscopy of microscopic sample areas for film thickness measurements, research into the optical characteristics of nanoparticles and optical coatings for the telecommunications industry.

4. Medical Uses

The application of NIRS in medicine centres on its ability to provide information about the oxygen saturation of haemoglobin within the microcirculation. Broadly speaking, it can be used to assess oxygenation and microvascular function in the brain (cerebral NIRS) or in the peripheral tissues (peripheral NIRS).

5. Particle Measurement

NIR is often used in particle sizing in a range of different fields, including studying pharmaceutical and agricultural powders.

6. Industrial Uses

As opposed to NIRS used in optical topography, general NIRS used in chemical assays does not provide imaging by mapping. For example, a clinical carbon dioxide analyzer requires reference techniques and calibration routines to be able to get accurate CO2 content change. In this case, calibration is performed by adjusting the zero control of the sample being tested after purposefully supplying 0% CO2 or another known amount of CO2 in the sample. Normal compressed gas from distributors contains about 95% O2 and 5% CO2, which can also be used to adjust %CO2 meter reading to be exactly 5% at initial calibration.

Specifications of Near-infrared Spectroscopy

Picture DW-EXPEC1330 Near Infrared Spectroscopy-3 NIR DW-EXPEC1350 Near-infrared Spectroscopy-3 NIR DW-EXPEC1360A Quick Fuel Analyzer-6 NIR DW-EXPEC1370 Near-infrared Spectroscopy(3)
Analysis sample Grain Solid and liquid samples, with various probes available Gasoline,diesel fuel,jet fuel. Grain and feed, Fertilizer products
Detector TEC refrigerated and temperature-controlled indium gallium arsenide (InGaAs) detector TEC refrigerated and temperature-controlled indium gallium arsenide (InGaAs) detector   TEC refrigerated and temperature-controlled indium gallium arsenide (InGaAs) detector
Expansion connection USB2.0 or Bluetooth USB2.0 LAN interface USB 2.0
Ambient temperature 5-40 ℃   5~45℃ 5~35°C
Wavelength range 1000-1800nm 1000-1800nm 1000-1800nm ( 1000~ 1800) nm & ( 1000~2500nm optional)

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