|Method||Fourier Transform Infra-Red Spectroscopy (FTIR)|
A variety of techniques, including:
Oxides of both sulfur and nitrogen
Can also be used to determine a range of other species, including soot, glycol (from coolants)
Anti-wear additives such as ZDDP, Phenols
Further uses include determination of FAME content (biodiesel) and comparative analysis
The instrument output is based on how covalent bonds move in a given substance when excited by light absorption at a variety of wavelengths. Infrared light is passed through a fine film of oil – by comparing with a base oil.
FTIR can tell us a variety of things, depending on the testing parameters.
These can include quantities of water, oxidation by-products, nitration, sulfonation, glycol, anti-oxidants, anti-wear, petrol, diesel, soot, and many more.
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