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The material properties of metal abrasive particles in oil could demonstrate the wear areas of the marine mechanical system because different components consist of different materials. However, most sensors can only roughly separate metallic contaminants into ferromagnetic and non-ferromagnetic particles but cannot differentiate them in greater detail. A micro-three-coil sensor is designed in this paper; the device applies different excitation signals to two excitation coils to differentiate materials, based on the different effects of different material particles in the asymmetric magnetic field. Therefore, a particle\u2019s material can be judged by the shape of the induction electromotive force output signal from the induction coil, while the particle size can be judged by the amplitude of the signal. Experimental results show that the material differentiation of four different types of particles can be achieved, namely, of aluminum, iron, 304 stainless steel, and carbon steel. This newly designed sensor provides a new research prospect for the realization of an inductive detection method to distinguish non-ferrous metals and a reference for the subsequent detection of metal contaminants in oil and other liquids.<\/jats:p>","DOI":"10.3390\/s23031637","type":"journal-article","created":{"date-parts":[[2023,2,2]],"date-time":"2023-02-02T02:57:24Z","timestamp":1675306644000},"page":"1637","update-policy":"https:\/\/doi.org\/10.3390\/mdpi_crossmark_policy","source":"Crossref","is-referenced-by-count":3,"title":["Micro-Three-Coil Sensor with Dual Excitation Signals Use Asymmetric Magnetic Fields to Distinguish between Non-Ferrous Metals"],"prefix":"10.3390","volume":"23","author":[{"ORCID":"https:\/\/orcid.org\/0000-0002-4245-1526","authenticated-orcid":false,"given":"Jiaju","family":"Hong","sequence":"first","affiliation":[{"name":"Marine Engineering College, Dalian Maritime University, Dalian 116026, China"}]},{"given":"Yucai","family":"Xie","sequence":"additional","affiliation":[{"name":"Marine Engineering College, Dalian Maritime University, Dalian 116026, China"}]},{"given":"Shuyao","family":"Zhang","sequence":"additional","affiliation":[{"name":"Navigation College, Dalian Maritime University, Dalian 116026, China"}]},{"ORCID":"https:\/\/orcid.org\/0000-0001-8222-8196","authenticated-orcid":false,"given":"Haotian","family":"Shi","sequence":"additional","affiliation":[{"name":"Marine Engineering College, Dalian Maritime University, Dalian 116026, China"}]},{"given":"Yu","family":"Liu","sequence":"additional","affiliation":[{"name":"Marine Engineering College, Dalian Maritime University, Dalian 116026, China"}]},{"ORCID":"https:\/\/orcid.org\/0000-0003-3172-600X","authenticated-orcid":false,"given":"Hongpeng","family":"Zhang","sequence":"additional","affiliation":[{"name":"Marine Engineering College, Dalian Maritime University, Dalian 116026, China"}]},{"given":"Yuqing","family":"Sun","sequence":"additional","affiliation":[{"name":"Marine Engineering College, Dalian Maritime University, Dalian 116026, China"}]}],"member":"1968","published-online":{"date-parts":[[2023,2,2]]},"reference":[{"key":"ref_1","doi-asserted-by":"crossref","first-page":"1","DOI":"10.1016\/j.triboint.2016.06.025","article-title":"Effect of abrasive size on friction and wear characteristics of nitrile butadiene rubber (NBR) in two-body abrasion","volume":"103","author":"Shen","year":"2016","journal-title":"Tribol. 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