Novel Chromatic Technique Based on Optical Absorbance in Characterizing Mineral Hydraulic Oil Degradation
- Novel Chromatic Technique Based on Optical Absorbance in Characterizing Mineral Hydraulic Oil Degradation
- Ossia; 공호성
- Oil; dedradation; Chromatic; Optical Absorbance; Oil Degradation
- Issue Date
- Advances in Tribology
- VOL 2012, 131956-1-131956-8
- 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 (X-Y Coordinates) and
increased with oil degradation unlike Saturation S and Hue H. 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.
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