Model of a Light Extinction Sensor for Assessing Wear Particle Distribution in a Lubricated Oil System

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Abstract

Light extinction based optical wear particle counters (OPCs) have been widely used in the industry for oil condition monitoring for several years, and while experiments have tested the benefits and drawbacks of the measurement principle, limited research has been conducted regarding a theoretical approach to evaluate opportunities and limitations of the measurement scheme. In this paper, we present a method for theoretically modelling the output of an OPC based on the light extinction principle in the regime of geometrical optics, with a special focus on the influence of sensor optical design, particle concentration and measurement noise. Moreover, we show that, if only signal amplitude is considered, an algorithm for evaluating sensor output can cause an erroneous assessment of particle contamination level.

Original languageEnglish
JournalSensors (Basel, Switzerland)
Volume18
Issue number12
ISSN1424-8220
DOIs
Publication statusPublished - 22. Nov 2018

Keywords

  • light extinction
  • oil condition monitoring
  • optical particle counter
  • particle distribution
  • wear debris
  • wear particle analysis

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