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A Precise Oxide Film Thickness Measurement Method Based on Swept Frequency and Transmission Cable Impedance
Yifan Li1, Qi Xiao1, Lisha Peng2
1School of Information Science and Technology, ShanghaiTech University, Shanghai 201210, China.
Sensors (Basel, Switzerland)
|January 25, 2025
Summary
Accurate measurement of nuclear fuel oxide film thickness is vital for safety. This study introduces a swept frequency eddy current testing method with transmission line impedance correction, significantly improving accuracy in poolside inspections.
Area of Science:
- Nuclear Engineering
- Materials Science
- Non-Destructive Testing
Background:
- Accurate measurement of oxide film thickness on nuclear fuel assemblies is crucial for nuclear power plant safety.
- Eddy current testing (ECT) is a common poolside inspection method, but long cables in pool environments introduce significant measurement errors.
- Swept frequency technology in ECT can improve accuracy, but its effectiveness is hampered by transmission line effects.
Purpose of the Study:
- To develop a high-precision measurement system for nuclear fuel oxide film thickness.
- To mitigate the impact of long transmission cables on swept frequency ECT measurements.
- To improve the accuracy of oxide film thickness measurements in nuclear power plant maintenance inspections.
Main Methods:
- Proposed a swept frequency eddy current testing method incorporating long transmission line impedance correction.
- Developed a transmission line model for cable signal calibration to eliminate cable influence.
- Created a swept frequency signal-processing algorithm to separate parameters and calculate oxide film thickness.
- Validated the method on fuel cladding samples with varying conductivities.
Main Results:
- The proposed method accurately assesses oxide film thickness across varying conductivities.
- Achieved a maximum error of 3.42 μm and an average error of 1.82 μm.
- Impedance correction reduced measurement error by 66%.
Conclusions:
- The developed method effectively eliminates the impact of long transmission cables on ECT measurements.
- The signal-processing algorithm successfully mitigates the influence of material conductivity.
- This technique is suitable for precise oxide film thickness measurements in nuclear power plant maintenance inspections.
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