Characterization of lubricating oil using ultrasound

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Higuti, Ricardo Tokio [UNESP]
Furukawa, Celso Massatoshi [UNESP]
Adamowski, Julio Cezar [UNESP]

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This paper presents an ultrasonic method to measure small concentrations of water in lubricating oil. It uses an ultrasonic measurement cell composed by a piezoceramic emitter (5 and 10 MHz), and a large aperture PVDF receiver that eliminates diffraction effects. The propagation velocity, attenuation coefficient and density of several samples of water-in-oil emulsion were measured. The concentrations of water of the samples were in the range of 0 to 5% in volume, and the results showed that these low concentrations can be discriminated within a resolution of 0.2% in the studied range, using the measurement of the propagation velocity.



Liquid characterization, Lubricating oil, Ultrasound, Attenuation, Characterization, Ultrasonic applications, Velocity, Water, Wave propagation, Attenuation coefficient, Piezoceramic emitter, Propagation velocity, Water in oil emulsion, Lubricating oils

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Revista Brasileira de Ciencias Mecanicas/Journal of the Brazilian Society of Mechanical Sciences, v. 23, n. 4, p. 453-461, 2001.