Article Article
Temperature Sensitivity Study of Eddy Current and Digital Gauge Probes for Oxide Measurement

Novel fuels are part of the nationwide effort to reduce the enrichment of Uranium for energy production. Fuel performance is determined by irradiating tfuel plates. The plate checker used in this experiment at Idaho National Lab (INL) performs nondestructive testing on fuel rod and plate geometries with two different types of sensors: eddy current and digital thickness gauges. The sensors measure oxide growth and sample thickness on research fuels, respectively. Sensor measurement accuracy is crucial because even microns of error is significant when determining the viability of an experimental fuel. One parameter known to affect the eddy current and digital gauge sensors is temperature. Since both sensor accuracies depend on the ambient temperature of the system, the plate checker has been characterized for these sensitivities. Additionally, the manufacturer of the digital gauge probes has noted a rather large coefficient of thermal expansion for their linear scale. In this work, the effect of temperature on the eddy current and digital gauge probes is evaluated, and thick-ness measurements are provided as empirical functions of temperature. Additionally, an experimental coefficient of thermal expansion for the probe material has been reported and compared with the manufacturer’s specifications.


Lion Precision, Eddy-Current Sensors Overview, 2013 (accessed May, 2016).

Lion Precision, Eddy Current Displacement Sensors ECL202 Data Sheets, http://www. 2010 (accessed May 13, 2016).

Paint and Coatings Industry, The Importance of Accurately Measuring Film Thickness, (accessed Jun. 13, 2018).

Measurement Technologies & Supply, Sony Magnescale DG25BS Digital Probe, 2000 (accessed Jun. 11, 2016).

K. Masaaki inventor; Sony Corporation, assignee. Magnetic position detector with multiple magnetoeffect resistance elements. United States patent US 5,216,363 (1993).

F. R. Beck, R. P. Lind, and J. A. Smith, AIP Publishing AIP Conf. Proc. 1949 (1), 160002 (2018).

K. Proctor and C. Maunder inventors; Weston Aerospace Ltd, assignee. Eddy current sensors. United States patent application US 11/002, 990 (2005).

H. Wang et al., Sens. Actuators A Phys. 211,98–104 (2014). DOI: 10.1016/j.sna.2014.03.008.

A. J. Fleming, Sens. Actuators A Phys. 190, 106–126 (2013). DOI: 10.1016/j.sna.2012.10.016.

Z. Chen,N.Yusa, andK.Miya, Nucl. Eng. Des. 238 (7), 1651–1656 (2008). DOI: 10.1016/j. nucengdes.2007.12.015.

Q. Li and F. Ding, Sens. Actuators A Phys. 122 (1), 83–87 (2005). DOI: 10.1016/j. sna.2005.04.008.

E. Gros et al. Determining confounding sensitivities in eddy current thin film measurements. Conference Proceedings of the 2016 Quantitative Nondestructive Evaluation, Atlanta, Georgia 2016.

G. Klein, J. Morelli, and T. W. Krause. Evaluation of effect of temperature variation on pressure tube to calandria tube gap measurements. Conference Proceedings of the 37th Annual Conference of the Canadian Nuclear Society and 41st Annual CNS/CNA Student Conference, 2017, Niagara Falls, Canada.

X. Mao and Y. Lei, NDT & E Int. 78,10–19 (2016). DOI: 10.1016/j.ndteint.2015.11.001.

Usage Shares
Total Views
36 Page Views
Total Shares
0 Tweets
0 PDF Downloads
0 Facebook Shares
Total Usage