Технічна інженерія (Dec 2022)
Optimizing the scanning speed of the eddy current metal detector
Abstract
The results of the identification of metal objects by an eddy current radio engineering system (RS) with amplitude-phase detection of the response signal during their dynamic scanning are considered. A mathematical model was developed that describes the changes in the information criteria of the response signal depending on the material of the investigated metal objects and the speed of their linear movement relative to the RS antenna. Simulations of response signals for several metals are carried out and comparisons with experimentally obtained results are given. The optimal range of scanning speeds was determined, which allows obtaining the maximum correlation difference of information criteria for different metals, which is recorded in a memory device and used for further identification of unknown conductive (metal) objects. The proposed mathematical model of the response signal of the eddy current device with a phase detector and the integral-differential approach to determining the correlation difference of the information criteria of the spectral and graphic-digital methods of identification of metal objects made it possible to experimentally determine the range of the optimal speed of movement of a metal object relative to the antenna system. The obtained experimental results showed that the maximum correlation difference of the information parameters of the proposed radio engineering system lies in the range of 12–14 Hz, which corresponds to the range of linear speeds of 4–6 m/s.
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