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Open AccessArticle

Improving Sensitivity of a Micro Inductive Sensor for Wear Debris Detection with Magnetic Powder Surrounded

1
College of Marine Engineering, Dalian Maritime University, Dalian 116026, China
2
School of Science, Dalian Maritime University, Dalian 116026, China
3
College of Electronic and Information Engineering, Guangdong Ocean University, Zhanjiang 524088, China
*
Author to whom correspondence should be addressed.
Micromachines 2019, 10(7), 440; https://doi.org/10.3390/mi10070440
Received: 22 May 2019 / Revised: 20 June 2019 / Accepted: 22 June 2019 / Published: 1 July 2019
(This article belongs to the Special Issue MEMS/NEMS Sensors: Fabrication and Application, Volume II)
The inductive detection of wear debris in lubrication oil is an effective method to monitor the machine status. As the wear debris is usually micro scale, a micro inductive sensor is always used to detect them in research papers or high-tech products. However, the improvement of detection sensitivity for micro inductive sensors is still a great challenge, especially for early wear debris of 20 μm or smaller diameter. This paper proposes a novel method to improve the detection sensitivity of a micro inductive sensor. Regarding the magnetic powder surrounding the sensor, the magnetic field in the core of the sensor where the wear debris pass through would be enhanced due to the increased relative permeability. Thus, the inductive signal would be improved and the detection sensitivity would be increased. It is found that the inductive signal would linearly increase with increasing the concentration of the magnetic powder and this enhancement would also be effective for wear debris of different sizes. In addition, the detection limit of the micro inductive sensor used in our experiment could be extended to 11 μm wear debris by the proposed method. View Full-Text
Keywords: micro inductive sensor; sensitivity; magnetic powder; wear debris; improvement micro inductive sensor; sensitivity; magnetic powder; wear debris; improvement
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MDPI and ACS Style

Liu, L.; Chen, L.; Wang, S.; Yin, Y.; Liu, D.; Wu, S.; Liu, Z.; Pan, X. Improving Sensitivity of a Micro Inductive Sensor for Wear Debris Detection with Magnetic Powder Surrounded. Micromachines 2019, 10, 440.

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