| abstract |
The present invention provides a method and a device for determining the degradation of a used oil. The method of the invention is based on calculating the components in the red, green and blue transmission spectral bands I R0 , I G0 and I B0 of the unused oil, carrying out a number of measurements of the transmittance of the same oil after use, calculating the colour indices of the used oil and the reference colour index as CI=1×I R +0.5×I 0 +0.5I B CI REF =1×I R0 0.5×I G0 +0.5I B0 and obtaining the overall degradation value as OD(%)=100−100×log 10 (CI REF /CI). By virtue of the method and the corresponding device, real-time monitoring of oil degradation is facilitated. |