Describe how impedance plane plots such as these could be used for metal

# Describe how impedance plane plots such as these

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Describe how impedance-plane plots such as these could be used for metal sorting. (6) Question 3: Which frequency provides better sensitivity when distinguishing between two samples with high conductivity? (4) Question 4 : Describe and give reasons for the distribution of the different signals on the impedance plane. What effect does the conductivity, lift-off and frequency have on the normalized resistance and inductive reactance of the coil, and why? (6) 4. Produce a new impedance plane plot for a ferrite material, with conductivity = σ 1.0 MS/m and relative magnetic permeability μ r = 1000, that shows the lift-off curves for frequencies 10 kHz, 500 kHz, and 2.0 MHz. Question 5: Describe and give reasons for the difference between the normalized inductive reactance for the ferrite material and for the non-ferromagnetic conductors studied above. (6) 5. Produce a plot that shows change in impedance as the probe moves from air to the test-piece (lift-off = 0.1 mm) versus conductivity for the metals given in Table 1, and for each frequency used. Include all frequency plots on one chart. (You should use the data generated by Teddy to create this plot, but you may need to use another plotting package such as excel to plot the curves.) Question 6: Explain how a chart like this could be used to select the optimum frequency that should be used to distinguish between two materials. (6) 6. To ensure that thickness variations do not affect conductivity measurements, the thickness of test specimens should be at least three times the standard depth of penetration (skin depth, ). δ Question 7: At three standard depths of penetration, what is the strength of the eddy currents relative to those at the surface of the material? (2)

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Question 8: Did all the samples used in this assignment satisfy the three times the standard depth of penetration requirement for the frequencies used? If not, which ones did not satisfy the requirement? (4) TOTAL: (40)
• Fall '19
• Inductor, Teddy, 8 mM, Ferrite, Eddy current, 0.1 mm

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