https://doi.org/10.15407/jopt.2018.53.261
Optoelectron. Semicond. Tech. 53, 261-267 (2018)
G.V. Dorozinsky, H.V. Dorozinska, V.P. Maslov
FEATURES OF REFRACTOMETRIC CHARACTERISTICS OF SURFACE PLASMON RESONANCE OF MOTOR OILS FOR USE
It has been experimentally shown that the information-important for the analysis of the engine oil condition is the initial stage of operation in the engine of the car. Engine oil changes its physical and chemical properties during operation, with frequent cases where one or several indicators of oil quality reach limit values long before its regular replacement. In order to prevent precipitation of oxidation products into the oil, special additives are introduced into the oil, with the reduction of which in the process of use there is a sharp decrease in the operation characteristics, which leads to rapid deterioration of the engine. Therefore, the study of the intensity of degradation of motor oils is an important direction for increasing the engine life and diagnostics of motor oils during operation. We tested 9 samples of Hyundai Super Extra 5W-30 oil with a run of 47, 150, 197, 292, 387, 549, 644, 834 and 928 km, as well as 8 samples of Castrol Edge 5W-40 oil with a run of 20, 40, 60 , 100, 170, 250, 500 and 1000 km, and comparative studies of their refractometric characteristics were carried out. According to the results of comparative studies of the surface plasmon resonance refractometric characteristics of motor oils samples by two brands Hyundai Super Extra 5W-30 and Castrol Edge 5W-40 with different mileage, it has been ascertained that the relative change in the angular position of the resonant angle during the period of operation can indicate the rate of degradation of motor oil, and a decrease in its value during the first 100 km of run - about the ingress of inorganic impurities in the oil: soot, fuel, water, antifreeze, which can characterize the state of the car fuel and lubrication systems. The results of the work may be useful for the development of new diagnostic systems of car maintenance stations.
Keywords: diagnostics, surface plasmon resonance, synthetic motor oils, car engine, operational wear