Start Date

2016 12:00 AM

Description

Exact solutions for the electromagnetic response of a transmit-receive coil pair situated above two parallel plates, separated by a gap, was developed using recently published solutions that account for all electromagnetic interactions between the voltage driven transmit coil, receive coil and conducting samples. This model was then compared to the canonical solutions developed by Dodd and Deeds, which assume an invariant current and open- circuited pick-up coil. Both analytical models were compared with experimental results that measured the gap profile for a Grade 2 Titanium plate (54 μΩ∙cm) over a SS-316 stainless steel second layer plate (74 μΩ∙cm). These materials simulated the electromagnetic properties of a Zr 2.5% Nb pressure tube and Zircaloy-2 calandria tube, respectively, as found in the fuel channels of CANDU® reactors. It was observed that Dodd and Deeds solutions were valid at low frequencies (2 kHz), but were less accurate at frequencies up to 16 kHz when all electromagnetic interactions needed to be taken into account to achieve good agreement with experiment.

Language

en

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application/pdf

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Jan 1st, 12:00 AM

Examination of Dodd and Deeds Solutions for a Transmit-Receive Eddy Current Probe above a Layered Planar Structure

Exact solutions for the electromagnetic response of a transmit-receive coil pair situated above two parallel plates, separated by a gap, was developed using recently published solutions that account for all electromagnetic interactions between the voltage driven transmit coil, receive coil and conducting samples. This model was then compared to the canonical solutions developed by Dodd and Deeds, which assume an invariant current and open- circuited pick-up coil. Both analytical models were compared with experimental results that measured the gap profile for a Grade 2 Titanium plate (54 μΩ∙cm) over a SS-316 stainless steel second layer plate (74 μΩ∙cm). These materials simulated the electromagnetic properties of a Zr 2.5% Nb pressure tube and Zircaloy-2 calandria tube, respectively, as found in the fuel channels of CANDU® reactors. It was observed that Dodd and Deeds solutions were valid at low frequencies (2 kHz), but were less accurate at frequencies up to 16 kHz when all electromagnetic interactions needed to be taken into account to achieve good agreement with experiment.