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Micromachines 2017, 8(8), 249; doi:10.3390/mi8080249

A Novel On-Chip Impedance Sensor for the Detection of Particle Contamination in Hydraulic Oil

1
Marine Engineering College, Dalian Maritime University, Dalian 116026, China
2
School of Naval Architecture and Ocean Engineering, Harbin Institute of Technology, Weihai 264209, China
*
Author to whom correspondence should be addressed.
Received: 13 June 2017 / Revised: 25 July 2017 / Accepted: 7 August 2017 / Published: 14 August 2017
(This article belongs to the Special Issue Micro/Nano-Chip Electrokinetics, Volume II)
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Abstract

A novel impedance sensor based on a microfluidic chip is presented. The sensor consists of two single-layer coils and a straight micro-channel, and can detect, not only ferromagnetic and non-ferromagnetic particles in oil as an inductive sensor, but also, water droplets and air bubbles in oil as a capacitive sensor. The experiments are carried out at different excitation frequencies, number of coil turns and particle sizes. For the inductance detection, the inductance signals are found to increase with the excitation frequency and the noise is constant; both the inductance signals and the noise increase with the number of coil turns, but because the noise increases at a faster rate than the signal, the signal-to-noise ratio decreases with the number of coil turns. We demonstrate the successful detection of 40 μm iron particles and 110 μm copper particles using the coil with 20 turns at the excitation frequency of 2 MHz. For the capacitance detection, capacitance signals decrease with the excitation frequency and the noise is constant; the capacitance signals decrease with the number of coil turns, while the noise increases, thus, the signal-to-noise ratio decreases with the number of coil turns. We can detect 100 μm water droplets and 180 μm bubbles successfully using the coil with 20 turns at the excitation frequency of 0.3 MHz. View Full-Text
Keywords: particle contamination; hydraulic oil; inductive sensor; capacitive sensor; microfluidic chip particle contamination; hydraulic oil; inductive sensor; capacitive sensor; microfluidic chip
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This is an open access article distributed under the Creative Commons Attribution License which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited. (CC BY 4.0).

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Zhang, H.; Zeng, L.; Teng, H.; Zhang, X. A Novel On-Chip Impedance Sensor for the Detection of Particle Contamination in Hydraulic Oil. Micromachines 2017, 8, 249.

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