fuel conamination

You can Test on FTIR at Spectral Location (apx. cm-1)

Correct. fuel contamination can be measured through FTIR and also by temperature using flash point. FTIR can also detect its oxidation, nitration, water content. i suggest do oil analysis to know your oil condition and to know where your fuel is coming from and address the root cause to eliminate in happening again.

The contamination of medium-speed engine lubricants with
residual fuel continues to be a common problem. Contamination
can occur through leaky fuel pumps or faulty fuel injectors
or as the result of poor combustion.

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Your best bet is gas chromatography (GC). It isn't very easy to set up but it is a much more direct way and hence more accurate than other techniques when done correctly. http://www.astm.org/Standards/D3524.htm

It has been determined that there is always a nominal amount of water in your fuel which will not impact fuel system operation. However, you need to be vigilant in the control of delivered water being a professional.

FTIR technique may not be proper as fuel dilution in Oil was measured based on concentration of sulphur peak & recently sulphur level in diesel is reduced all over,
also diesel concentration is different in all countries. GC method is more reliable method.