All live material vibrates in different, known frequencies. By sending light towards the live matter and detecting which frequencies have been absorbed after transmission or reflection, it is thus possible to establish the content of the analyzed matter.
              

NIR analyses is using the near infra Red spectrum. ASD Inc. instruments are even making use of the visible light on top of that. (350-2.500 nm).

Traditional – pre dispersive - NIR send out the light in known frequencies, which means that they have to shelter the sample from false frequencies.

Post dispersive NIR – as we are making use of – sends out so much light, that we dilute the problem of false information. Without any loss of accuracy!

If you apply Post dispersive NIR it is thus not necessary to take a sample or to shelter the analyzed matter.

That makes room for quite a few new applications.

IR/FTIR analysis works basically the same way as NIR, just using a different spectrum. Measurements within the mid-infra red spectrum are more accurate, but the energy is on the other hand so low, that in reality you can only measure low viscous liquids.
      
In an infra red instrument the liquid is pumped through a cuvette, so that it appears as a thin line, which can be analyzed – normally in transmission.

FTIR (Fourir Transform IR) is a technology which allows a simultaneous reading of the full spectrum, which gives us access to much more information over and above the traditional ones: Fat, Protein, Lactose and TS. Delta Instruments FTIR analyses over and above F, P, L and TS also: Density, Casein, True Protein, Urea, FFA, pH and Citric Acid.

A filter IR can only analyze those parameters the filters are set for. That on the other hand gives you a good basic alternative to the somewhat more expensive FTIR instruments.

Raman technology is based on the fact, that photons change their level of energy, when they meet the matter you are analyzing. A laser radiates photons from a very specific frequency.
            
When they meet the analyzed matter they scatter and drop in energy which is shown in the frequencies of the photons received by the detector.

This gives you a lot of information about the analyzed matter.

Raman is in particular well suited for identification analysis, but with the new technology: ”Surface enhanced Raman scattering”, that Raman Systems is making use of, you can over and above that get fairly good quantity analysis.

Raman doesn’t see water or particle sizes, which gives you new possibilities compared to NIR.

Raman is used for very different kinds of analysis, for instance: Counterfeit diamonds, BUN online analysis and identification of raw products.