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

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...

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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.

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