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

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

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