The Remote Eddy-Current Analysis of a Composition of Metal Objects
A. O. Abramovych, I. S. Kashirsky, V. O. Piddubniy
National Technical University of Ukraine ‘Igor Sikorsky Kyiv Polytechnic Institute’, 37 Peremohy Ave., UA-03056 Kyiv, Ukraine
Received: 07.06.2017. Download: PDF
For the remote determination of a metal-object composition, the eddy-current method of sensing is used. It is based on the interaction of electromagnetic radiation with metal objects contained in a dielectric medium where their electrical or magnetic properties differ from the properties of this medium. Traditional eddy-current methods usually allow the identification of a metal object and its dichotomous (black/non-ferrous) metal, but do not allow distinguishing the type of metal in the subgroups of ferrous and non-ferrous metals. The type of metal can be determined only in laboratory conditions on special metal detectors. In this paper, it is suggested to use a specially designed digital device for objects’ near-locating (metal analyser), built on the eddy-current method of detecting the metal objects, coupled with the original method of processing the signal reflected from object. Processing of the signal can be done in two ways—amplitude one and graphic-images’ method, which are based on comparison of the signal obtained from the investigated object with etalon ones. The proposed method allows determining remotely the type of metal in the subgroups of ferrous and non-ferrous metals.
Key words: electromagnetic properties of metals, eddy-current converter, location devices, remote chemical analysis.
PACS: 07.05.Kf, 42.25.Gy, 42.30.Va, 81.70.Ex, 81.70.Jb, 84.40.Xb
Citation: A. O. Abramovych, I. S. Kashirsky, and V. O. Piddubniy, The Remote Eddy-Current Analysis of a Composition of Metal Objects, Metallofiz. Noveishie Tekhnol., 39, No. 8: 1035—1049 (2017) (in Ukrainian)