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Calculation of optimum spacing for a three coil axially symmetric metal detector

Calculation of optimum spacing for a three coil axially symmetric metal detector

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© The Institution of Electrical Engineers
Published

When designing an in-line metal detector, a three coil axially symmetric design is often employed. For maximum sensitivity to small particles, the spacing of the coils is an important factor. A formula is derived which predicts the signal produced by a metal sphere when moved along the axis of such a detector and from this a graph is produced to determine the optimum coil spacing.

Inspec keywords: electromagnetic field theory; electromagnetic devices; coils; electric sensing devices

Other keywords: bearing failure detection; food contamination detection; metallic particles detection; metal sphere; three coil axially symmetric metal detector; optimum coil spacing; in-line metal detector

Subjects: Other electromagnetic device applications; Sensing devices and transducers; Inductors and transformers

References

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      • W.R. Smythe . (1950) , Static and dynamic electricity.
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      • G.R. Hugo , S.K. Burke . Impedance changes in a coil due to a nearby small conducting sphere. J. Phys. D: Appl. Phys. , 33 - 38
    3. 3)
      • S.S. Sidhu . Computation of the elliptic functions used in calculating electron emission from surfaces. J. Vac. Sci. Technol. B , 879 - 880
    4. 4)
      • T. Butler . Metal detection testing provides protection for consumers and machinery. Sens. Rev. , 1 , 10 - 14
    5. 5)
      • R.A. Masom . The development, proving, and application of an in-line metal particle detector (MPD). Brit. J. Non Destruct. Test. , 3 , 159 - 166
    6. 6)
      • H.C. Miller . Inductance formula for a single-layer circular coil. Proc. IEEE , 2 , 256 - 257
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