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Quantifying the Detection Capability of Metal Detectors using Metal Spheres
Plots of maximum detection distance as a function of target radius, for a set of metal balls, have been used as a measure of the sensitivity of metal detectors. This simple idea allows detection capability at a given distance to be quantified. One of the advantages of the sphere is that it is easily modelled mathematically. We compare results of detector measurements with theory for some of the metals tested. In particular, both theory and experiment support the use of permeable steel balls as standard test targets.