Novel Chromatic Technique Based on Optical Absorbance in Characterizing Mineral Hydraulic Oil Degradation

Abstract

A low cost, compact, real-time, and quick measurement optical device based on the absorbance of white light, which comprised of photodiodes in a 3-element color-sensor, feedback diodes, water and temperature sensing element, and so on, was developed and tested in low absorption mineral oil. The device, a deviation from conventional electrical, mechanical, and electrochemical techniques, uses color ratio (CR) and total contamination index (TCI) parameters based on transmitted light intensity in RGB wavelengths for oil condition monitoring. Test results showed that CR corroborated CIE chromaticity (- Coordinates) and increased with oil degradation unlike Saturation and Hue . CR was found to be independent of the particulate contaminants of oil, but dependent on chemical degradation. TCI depended on both chemical degradation and particulate contaminants in oil, being most sensitive in the blue wavelength range and least in the green. Furthermore, results agreed with those of viscometry, total acid number (TAN), and UV-VIS photospectrometry. CR and TCI gave clearer indication of oil degradation than key monitoring parameters like TAN and were found to be effective criteria for characterizing the degradation of hydraulic mineral oils.

Potensi Cahaya Laser sebagai Sensor Kadar Asam Lemak Jenuh pada Minyak Jelantah

“…Hal ini berbeda dengan penelitian Oyem bahwa asam lemak bebas ketika disimpan dalam panjang gelombang hijau lebih sensitif daripada panjang gelombang merah maupun biru yang ditunjukkan besar kandungan asam lemak bebas [11]. Sedangkan, hasil penelitian lain absorbansi asam lemak bebas memiliki sensitive di area panjang gelombang biru -UV [12,13]. Namun, penelitian Leong dkk, panjang gelombang 360 -600 nm sangat sensitif untuk material minyak [14].…”

Engine oil quality deterioration estimation using an integrated sensory system

“…red, green and blue demonstrate a good correlation to viscosity, TAN and Fe-particle concentration(C. V. Ossia et al, 2010).Utilizing Polychromatic (white LED) source and colour sensor shows that the output coordinates go up with an increase in the oil degradation. Arti cially degraded oils, output results are also compared with viscometer, TAN and UV-VIS photo spectrometry (Ossia and Kong, 2012).Previous studies have emphasized use of a colour sensor to measure the deterioration in the TAN.The TAN and oxidation parameters increase results in darkening the colour of the oil (Myshkin and Markova, 2018). An object shape based optical sensing technique used for analysing lubricants that are contaminated can distinguish 1%, 4%, 7%, and 10% water contamination, coolant, and gasoline (Bordatchev et al, 2014).…”

“…27 Artificially degraded oils, output results are also compared with a viscometer, TAN and UV-Vis photospectrometry. 28 Previous studies have emphasized the use of a colour sensor to measure the deterioration in the TAN. The TAN and oxidation parameters increase resulting in the darkening of the colour of the oil.…”

UV-Vis Spectroscopy: A New Approach for Assessing the Color Index of Transformer Insulating Oil

“…UV-Vis spectroscopy also has been widely used in evaluating olive oil since the components within such as chlorophyll and lutein are responsible for the color of olive oil [ 25 , 26 ]. Besides palm oil and olive oil, researchers have also applied the UV-Vis spectroscopy in determining the color in crude petroleum oil [ 27 ], hydraulic oil [ 28 ], automotive lubricating oil [ 29 ], essential oil [ 30 ], pumpkin seed oil [ 31 ], and edible oils (sunflower oil, soya oil, corn oil, canola oil, and olive oil) [ 32 ]. Moreover, Hadjadj et al [ 21 ] have proposed the determination of the correlation between proposed parameters, which are turbidity and dissolved decay product (DDP) value, and the traditional parameters such as interfacial tension, acidity and color index of transformer oil using UV-Vis spectroscopy.…”