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A non-contact electromagnetic detection method for discrete-phase non-conductive particles

An electromagnetic detection and discrete phase technology, applied in individual particle analysis, particle and sedimentation analysis, measuring devices, etc., can solve the problems of rapid and effective detection and counting of few discrete phase non-conductive particles, long detection time, complex operation process, etc. , to achieve efficient real-time detection, easy processing and production, and flexible application

Active Publication Date: 2021-08-24
BEIHANG UNIV
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AI Technical Summary

Problems solved by technology

[0004] However, the traditional physical and chemical detection methods in the prior art have disadvantages such as complex operation process, long detection time and need to contact with the measured object. There are few methods for fast and effective detection and counting of discrete phase non-conductive particles.

Method used

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  • A non-contact electromagnetic detection method for discrete-phase non-conductive particles
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  • A non-contact electromagnetic detection method for discrete-phase non-conductive particles

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Embodiment Construction

[0029] The following will clearly and completely describe the technical solutions in the embodiments of the present invention with reference to the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only some, not all, embodiments of the present invention. Based on the embodiments of the present invention, all other embodiments obtained by persons of ordinary skill in the art without making creative efforts belong to the protection scope of the present invention.

[0030] The present invention provides a non-contact electromagnetic detection method for discrete phase non-conductive particles, such as figure 2 As shown, the specific steps are as follows:

[0031] Step 1. For the current moment, place the multi-turn tiny coil coaxially and perpendicular to the measured discrete phase area, and apply high-frequency sinusoidal current excitation to the coil, thereby generating an alternating magnetic field in the measured d...

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Abstract

The invention discloses a non-contact electromagnetic detection method for discrete-phase non-conductive particles, which belongs to the field of electromagnetic measurement. The principle of the loop is to perform frequency mixing and low-pass filtering on the induced voltage signal and the reference signal, demodulate the phase, and then judge whether the phase corresponding to the induced voltage signal is equal to the phase when no non-conductive particles pass through. If so, the discrete phase is normal, and the next moment Otherwise, it means that the discrete phase has non-conductive particles passing through; through uninterrupted measurement, the phase corresponding to each moment is obtained, and finally, according to the selected threshold τ, each phase value is compared one by one, so as to pass the statistical phase The number of exceptions is obtained by counting the discrete phase non-conductive particles. The invention realizes high-efficiency and real-time detection of non-conductive particles in the flowing discrete phase.

Description

technical field [0001] The invention belongs to the field of electromagnetic measurement, in particular to a non-contact electromagnetic detection method for discrete-phase non-conductive particles, which is used for detection and counting of discrete-phase non-conductive particles. Background technique [0002] In recent years, with the mass production and use of plastics, the concentration of microplastic particles in the environment has been increasing. Microplastic pollution has become a global environmental problem and has attracted widespread attention from academia and the public. [0003] Microplastics usually refer to plastic particles with a particle size of less than 5 mm, which is a new type of environmental pollutant. At present, researchers have found traces of microplastics in freshwater waters, marine water bodies, terrestrial environments, atmospheric particles, and organisms. The harm is mainly manifested in two aspects: one is that microplastics are not di...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G01N15/10
Inventor 刘顿索鹏孙江涛徐立军谢跃东
Owner BEIHANG UNIV
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