Application of poly-harmonic signals to eddy-current metal detectors and to advanced classification of metals

• Autorzy: Svatoš J. , Pospíšil T. , Vedral J.

Identyfikatory

DOI

10.24425/119564

• Języki publikacji: EN

Abstrakty

EN

A limited ability to discriminate between different materials is the fundamental problem with all conventional eddy-current-based metal detectors. This paper presents the use, evaluation and classification of nontraditional excitation signals for eddy-current metal detectors to improve their detection and discrimination ability. The presented multi-frequency excitation signals are as follows: a step sweep sine wave, a linear frequency sweep and sin(x)/x signals. All signals are evaluated in the frequency domain. Amplitude and phase spectra and polar graphs of the detector output signal are used for classification and discrimination of the tested objects. Four different classifiers are presented. The classification results obtained with the use of poly-harmonic signals are compared with those obtained with a classical single-tone method. Multi-frequency signals provide more detailed information, due to the response function - the frequency characteristic of a detected object, than standard single-tone methods. Based on the measurements and analysis, a metal object can be better distinguished than when using a single-tone method.

Słowa kluczowe

EN

eddy current; metal detector; polyharmonic signal; signal processing; classification

• Wydawca: Komitet Metrologii i Aparatury Naukowej PAN
• Czasopismo: Metrology and Measurement Systems
• Rocznik: 2018
• Tom: Vol. 25, nr 2
• Strony: 387--402
• Opis fizyczny: Bibliogr. 29 poz., rys., tab., wykr., wzory

Twórcy

autor

Svatoš J.

• Czech Technical University in Prague, Department of Measurement, Prague 6, Technická 2, 16627, Czech Republic

autor

Pospíšil T.

• Czech Technical University in Prague, Department of Measurement, Prague 6, Technická 2, 16627, Czech Republic

autor

Vedral J.

• Czech Technical University in Prague, Department of Measurement, Prague 6, Technická 2, 16627, Czech Republic

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Uwagi

EN

1. This research was supported by the SGS16/171/OHK3/2T/13 grant provided by the Grant Agency of the Czech Technical University in Prague.

PL

2. Opracowanie rekordu w ramach umowy 509/P-DUN/2018 ze środków MNiSW przeznaczonych na działalność upowszechniającą naukę (2018).