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Related Experiment Video

Updated: Jul 16, 2026

Crack Monitoring in Resonance Fatigue Testing of Welded Specimens Using Digital Image Correlation

Crack Monitoring in Resonance Fatigue Testing of Welded Specimens Using Digital Image Correlation

Published on: September 29, 2019

An Enhanced Absolute Eddy Current Probe for Surface Cracks Detection at High Temperatures.

Zhiying Liu¹, Wenze Shi¹, Chao Lu¹

¹Key Laboratory of Non-Destructive Testing, Ministry of Education, Nanchang Hangkong University, Nanchang 330063, China.

Sensors (Basel, Switzerland)

|July 15, 2026

Summary

This study introduces an improved eddy current probe with water-cooling for detecting cracks in high-temperature Inconel 718 alloys. The optimized probe enhances detection sensitivity and reliability in extreme industrial environments.

Keywords:

high-temperature eddy current testing nickel-based alloy optimal design surface cracks water-cooled sensor

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Last Updated: Jul 16, 2026

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Published on: January 16, 2020

Area of Science:

Materials Science
Non-Destructive Testing
Aerospace Engineering

Background:

High-temperature surface crack detection in Inconel 718 is vital for aero-engine safety.
Conventional eddy current testing faces limitations due to thermal degradation and low signal-to-noise ratios.

Purpose of the Study:

To develop an optimized absolute eddy current probe with water-cooling for enhanced non-destructive evaluation.
To improve crack detection sensitivity and reliability in extreme thermal conditions.

Main Methods:

Multi-physics finite element modeling was used to optimize probe design parameters (frequency, coil/core geometry).
An efficient water-cooling system was integrated with an absolute eddy current probe.
Experimental validation was performed to assess probe performance.

Main Results:

The optimized probe demonstrated a 76.2% increase in peak amplitude and nearly 10 dB signal-to-noise improvement for a 0.3 mm crack.
High-sensitivity detection of a 0.3 mm crack was achieved at 500 °C.
Reliable detection of a 0.5 mm crack at 600 °C (CV < 3.5%) and detection capability at 650 °C were confirmed.

Conclusions:

The optimized water-cooled eddy current probe offers a viable solution for non-destructive evaluation in extreme industrial thermal environments.
This sensor design significantly enhances detection capabilities for surface cracks in nickel-based alloys operating at high temperatures.