We present the design, fabrication and testing of a microfluidic device for metal wear detection in lubrication oils. The detection is based upon the capacitance Coulter counting principle, that is, on the change in a microchannel’s capacitance caused by the presence of a metal particle in the microchannel. Preliminary testing on the microfluidic device using 20 μm aluminum particles has demonstrated the feasibility of using this microfluidic device for detection and counting of micro metal particles in non conductive lubricant oil. This microfluidic device is promising for online oil debris detection by the use of multiple detection microfluidic channels.

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