Electromagnetic particle detection method
A detection method and micro-particle technology, applied in particle and sedimentation analysis, measuring devices, particle size analysis, etc., can solve the problems of indistinguishable particle attributes, limited abrasive particles, etc., and achieve easy automation and miniaturization, high sensitivity, and small size Effect
Active Publication Date: 2019-11-19
UNIVERSITY OF CHINESE ACADEMY OF SCIENCES
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Problems solved by technology
The first three methods cannot distinguish the properties of the particles, while the inductance detection method is limited by the solenoid processing technology, and the current practical application is basically limited to the detection of abrasive particles above 200 μm
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[0030] The technical solutions of the present invention will be described in further detail below with reference to the accompanying drawings and embodiments.
[0031] The electromagnetic microparticle detection method of the present invention proposes a new method, which can truly realize the detection of microparticles in fluids, for example: online accurate measurement of oil particle pollution, avoid sudden failure of working components, and reduce time-consuming and laborious It has broad application prospects.
[0032] figure 1 The schematic diagram of the embodiment for the measurement of the electromagnetic microparticle detection method of the present invention, as shown in the figure, includes a fluid 1 forming a jet or a fluid 1 flowing in a fixed channel, a tiny permanent magnet 2 placed on the surface of the fluid 1 to be measured, and The magnetic sensor 3 which keeps a certain position with the tiny permanent magnet, the microparticles or foreign substances 4 i...
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Abstract
The invention relates to a novel electromagnetic microparticle detection method. The method comprises the following steps: 1)a minimal permanent magnet is placed near the to-be-detected fluid, wherein the magnetic field provided by the minimal permanent magnet penetrates into the fluid; 2) relative flowing or motion is generated between the minimal permanent magnet and the to-be-detected fluid; 3) the change of the induced magnetic field around the to-be-detected fluid due to microparticle or heterogeneous substances in the to-be-detected fluid is detected; and 4) and the characteristic of the microparticle or heterogeneous substances can be detected through the variance of the induced magnetic field. The electromagnetic microparticle detection method has the advantages that a used measuring instrument has simple mechanism; measurement is accurate, the measurement efficiency is high; in-situ on-line measurement is realized, magnetic conduction of the to-be-detected particles is not required, and the method has wider application field and scope.
Description
technical field [0001] The invention relates to a method for detecting electromagnetic microparticles, in particular to a measurement method for detecting microparticles or substances in fluids based on electromagnetic induction effects. Background technique [0002] Effective detection of microparticles in fluids has great practical application and economic significance, for example: detection of suspended abrasive particles in oil. All kinds of mechanical equipment contain a large number of friction pairs, and a large number of abrasive particles are suspended in the oil during the working process. Among them, solid particles are the main pollutants, and 80% of component failures are caused by wear. Wear contaminants in lubricating and hydraulic oils have a constant concentration and small particle size; when abnormal wear occurs, the concentration of abrasive particles increases; the concentration and size of metal particles continue to increase until the machine fails. ...
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IPC IPC(8): G01N15/00G01N15/02
CPCG01N15/00G01N15/02G01N2015/0294
Inventor 代尚军王晓东
Owner UNIVERSITY OF CHINESE ACADEMY OF SCIENCES