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Sensors 2011, 11(11), 10675-10690; doi:10.3390/s111110675

Low-Cost Oil Quality Sensor Based on Changes in Complex Permittivity

Sustainable Design Research Centre, Bournemouth University, Fern Barrow, Talbot Campus, Poole, Dorset, BH12 5BB, UK
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Received: 10 October 2011 / Revised: 31 October 2011 / Accepted: 4 November 2011 / Published: 10 November 2011
(This article belongs to the Section Physical Sensors)

Abstract

Real time oil quality monitoring techniques help to protect important industry assets, minimize downtime and reduce maintenance costs. The measurement of a lubricant’s complex permittivity is an effective indicator of the oil degradation process and it can be useful in condition based maintenance (CBM) to select the most adequate oil replacement maintenance schedules. A discussion of the working principles of an oil quality sensor based on a marginal oscillator to monitor the losses of the dielectric at high frequencies (>1 MHz) is presented. An electronic design procedure is covered which results in a low cost, effective and ruggedized sensor implementation suitable for use in harsh environments.
Keywords: oil quality; impedance spectroscopy; marginal oscillator; dielectric; permittivity; lubrication oil; on-line monitoring oil quality; impedance spectroscopy; marginal oscillator; dielectric; permittivity; lubrication oil; on-line monitoring
This is an open access article distributed under the Creative Commons Attribution License (CC BY 3.0).

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MDPI and ACS Style

Pérez, A.T.; Hadfield, M. Low-Cost Oil Quality Sensor Based on Changes in Complex Permittivity. Sensors 2011, 11, 10675-10690.

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