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Measurement of Electrical Discharge Machining Oil Quality by Analyzing Variations in the Equivalent Relative Permittivity of the Capacitive Sensor

descriptionPublicationkeyboard_double_arrow_right Article , Other literature type 02 Nov 2020Publisher:MDPI AGJournal:Sensors, volume 20, page 6,248 (eissn: 1424-8220,

Authors: Shih-Jui Chen; Yi-Li Chen; Yu-Jui Chang; Dong-Lin Chuang; Yi-Chun Chen; Hai-Ping Tsui; Yean-Ren Hwang;

doi: 10.3390/s20216248

pmid: 33147780

pmc: PMC7662549

Measurement of Electrical Discharge Machining Oil Quality by Analyzing Variations in the Equivalent Relative Permittivity of the Capacitive Sensor

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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.

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Keywords

Letter, capacitive sensors, Chemical technology, equivalent relative permittivity, TP1-1185, electrical discharge machining oil

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