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Multichannel Inductive Sensor Based on Phase Division Multiplexing for Wear Debris Detection

1
College of Marine Engineering, Dalian Maritime University, Dalian 116026, China
2
College of Navigation, Guangdong Ocean University, Zhanjiang 524088, China
*
Author to whom correspondence should be addressed.
Micromachines 2019, 10(4), 246; https://doi.org/10.3390/mi10040246
Received: 20 March 2019 / Revised: 8 April 2019 / Accepted: 11 April 2019 / Published: 13 April 2019
(This article belongs to the Special Issue MEMS/NEMS Sensors: Fabrication and Application, Volume II)
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Abstract

Inductive wear debris sensor has been widely used in real time machine lubricant oil condition monitoring and fault forecasting. However, the small sensing zone, which is designed for high sensitivity, of the existing sensors leads to low throughput. In order to improve the throughput, a novel multichannel wear debris sensor that is based on phase division multiplexing is presented. By introducing the phase shift circuit into the system, multiple sensing coils could work at different initial phases. Multiple signals of sensing coils could be combined into one output without information loss. Synchronized sampling is used for data recording, and output signals of multiple sensing coils are extracted from the recorded data. A four-channel wear debris sensor system was designed to demonstrate our method. Subsequently, crosstalk analysis, pseudo-dynamic testing and dynamic testing were conducted to check the sensing system. Results show that signals of four sensing coils could be simultaneously detected and the detection limit for ferrous wear debris is 33 μm. Using the presented method, real time wear debris detection in multiple channels could be achieved without increasing the number of excitation source and data acquisition equipment. View Full-Text
Keywords: inductive sensor; multichannel; phase division multiplexing; synchronized sampling; wear debris; microfluidics inductive sensor; multichannel; phase division multiplexing; synchronized sampling; wear debris; microfluidics
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Wu, S.; Liu, Z.; Yuan, H.; Yu, K.; Gao, Y.; Liu, L.; Pan, X. Multichannel Inductive Sensor Based on Phase Division Multiplexing for Wear Debris Detection. Micromachines 2019, 10, 246.

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