On the magnetic polarizability tensor of US coinage. (13th February 2018)

• Record Type: Journal Article
• Authors: Davidson, John L; Abdel-Rehim, Omar A; Hu, Peipei; Marsh, Liam A; O'Toole, Michael D; Peyton, Anthony J
• Is Part Of: Measurement science & technology. Volume 29:Number 3(2018:Mar.)
• Publication Date: 2018-02-13
• Subjects: magnetic polarizability tensor -- electromagnetic induction spectroscopy -- metal detection -- landmine discrimination -- coin; Physical measurements -- Periodicals; Scientific apparatus and instruments -- Periodicals; Equipment and Supplies -- Periodicals; Science -- instrumentation -- Periodicals; Technology -- instrumentation -- Periodicals; Mesures physiques -- Périodiques; Physical measurements; Scientific apparatus and instruments; Periodicals; 502.87
• DOI: 10.1088/1361-6501/aa9cf2
• Languages: English
• ISSNs: 0957-0233

Abstract

Abstract: The magnetic dipole polarizability tensor of a metallic object gives unique information about the size, shape and electromagnetic properties of the object. In this paper, we present a novel method of coin characterization based on the spectroscopic response of the absolute tensor. The experimental measurements are validated using a combination of tests with a small set of bespoke coin surrogates and simulated data. The method is applied to an uncirculated set of US coins. Measured and simulated spectroscopic tensor responses of the coins show significant differences between different coin denominations. The presented results are encouraging as they strongly demonstrate the ability to characterize coins using an absolute tensor approach.