Application of spectral analysis for differentiation between metals using signals from eddy-current transducers

Authors

DOI:

https://doi.org/10.15587/1729-4061.2017.110177

Keywords:

dichotomy, vortex-current metal detector, VLF metal detector, PI metal detector, Foucault currents, microcontrollers

Abstract

The authors theoretically and experimentally substantiated the use of the spectral method for processing a signal of the vortex-current metal detector for dichotomous differentiation between metals. Results of experimental research that prove the possibility of using spectral analysis for differentiation between metals were presented.

The vortex-current method for detection of hidden metal objects was analyzed. It was indicated that amplitude of output VCD signal is determined by electric conductivity of material of a hidden object and its magnetic permeability. It was shown that the spectral density of a signal can be an informative feature.

The authors designed and fabricated a mockup of the vortex-current device, the special features of which include modularity, which, if necessary, makes it possible to replace quickly each of the modules. The developed algorithm of normalization of signals allows an operator to choose freely a scan mode and compare correctly VCD signals with reference signals.

Research results show that it is possible to distinguish easily between the spectra of ferrous metals and those of non-ferrous metals. Spectral methods can be applied both for dichotomous analysis of hidden metal objects and for analysis of the type of metal in the subgroup of non-ferrous metals under condition of using highly sensitive spectroanalyzers with measurement error not exceeding 1 %.

It was shown that advantage of the spectral method for analysis of signals of vortex-current transducer is identification of hidden objects by type of metal. The use of spectral methods for detection of hidden metals offers a new property – distant analysis of composition of detected metal objects. 

Author Biographies

Anton Abramovych, National Technical University of Ukraine "Igor Sikorsky Kyiv Polytechnic Institute" Peremohy ave., 37, Kyiv, Ukraine, 03056

Postgraduate student

Department of Radioengineering Devices and Systems

Volodymyr Poddubny, National Technical University of Ukraine "Igor Sikorsky Kyiv Polytechnic Institute" Peremohy ave., 37, Kyiv, Ukraine, 03056

PhD, Аssociate Professor

Department of Radioengineering Devices and Systems

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Published

2017-10-30

How to Cite

Abramovych, A., & Poddubny, V. (2017). Application of spectral analysis for differentiation between metals using signals from eddy-current transducers. Eastern-European Journal of Enterprise Technologies, 5(5 (89), 51–57. https://doi.org/10.15587/1729-4061.2017.110177

Issue

Vol. 5 No. 5 (89) (2017): APPLIED PHYSICS

Section

Applied physics

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Copyright (c) 2017 Anton Abramovych, Volodymyr Poddubny

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