Measurement of electrical discharge machining oil quality by analyzing variations in the equivalent relative permittivity of the capacitive sensor

Shih Jui Chen, Yi Li Chen, Yu Jui Chang, Dong Lin Chuang, Yi Chun Chen, Hai Ping Tsui, Yean Ren Hwang

Research output: Contribution to journalLetterpeer-review

3 Scopus citations

Abstract

In this study, a concentration monitoring system was successfully developed. A sensor was immersed in electrical discharge machining oil, and the capacitance of the sensor changed as a function of the impurity concentration. Thus, DC voltage variations were produced via a conversion circuit. Carbon black and iron particles with different concentrations were successfully characterized. The capacitance increments were positively correlated with the particle concentration. The linear fitting results based on the impurity concentration were used to express the degree of influence of particles with different weight percentage concentrations on the increase in the overall capacitance value. An equivalent medium theory model was then developed according to the electrical characteristics of the impurities to predict different particle volume percentages.

Original languageEnglish
Article number6248
Pages (from-to)1-11
Number of pages11
JournalSensors (Switzerland)
Volume20
Issue number21
DOIs
StatePublished - 1 Nov 2020

Keywords

  • Capacitive sensors
  • Electrical discharge machining oil
  • Equivalent relative permittivity

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