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Related Concept Videos

Eddy Currents01:25

Eddy Currents

Since eddy currents occur only in conductors, magnets can separate metals from other materials. For example, in a recycling center, trash is dumped in batches down a ramp, beneath which lies a powerful magnet. Conductors in the trash are slowed by eddy currents, while nonmetals in the trash move on, separating from the metals. This works for all metals, not just ferromagnetic ones.
Other major applications of eddy currents appear in metal detectors and the braking systems of trains and roller...

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Related Experiment Video

Updated: May 28, 2026

Quantifying the Relative Thickness of Conductive Ferromagnetic Materials Using Detector Coil-Based Pulsed Eddy Current Sensors
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Quantifying the Relative Thickness of Conductive Ferromagnetic Materials Using Detector Coil-Based Pulsed Eddy Current Sensors

Published on: January 16, 2020

Ceramic-Integrated Eddy Current Sensor for Blade Tip Clearance Measurement: Design and Performance Evaluation.

Qiang Miao1, Zhichun Liu1, Qijian Liu1

  • 1School of Aerospace Engineering, Xiamen University, Xiamen 361102, China.

Sensors (Basel, Switzerland)
|May 27, 2026
PubMed
Summary
This summary is machine-generated.

This study introduces a novel ceramic-integrated printed coil eddy current sensor (ECS) for precise blade tip clearance (BTC) monitoring in aero-engines. The new sensor offers high accuracy, stability, and high-temperature tolerance, improving engine performance and safety.

Keywords:
blade tip clearance measurementceramic integrationeddy current sensorhigh temperature tolerance

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Area of Science:

  • Aerospace Engineering
  • Materials Science
  • Sensor Technology

Background:

  • Blade tip clearance (BTC) is crucial for aero-engine performance, fuel efficiency, and safety.
  • Traditional eddy current sensors (ECS) have limitations in consistency and geometric design, hindering optimization.
  • Existing sensors struggle with high-temperature operational demands.

Purpose of the Study:

  • To develop a novel eddy current sensor (ECS) for accurate blade tip clearance (BTC) measurement.
  • To overcome the limitations of traditional wound coil sensors.
  • To enhance sensor performance in high-temperature aero-engine environments.

Main Methods:

  • Utilizing screen printing technology to fabricate metal coils directly onto ceramic substrates.
  • Integrating coils and substrates into a single, robust unit for enhanced structural stability.
  • Designing coils with high precision for optimal electromagnetic performance and various topologies.

Main Results:

  • Achieved manufacturing accuracy of 0.2 mm or better for the novel ECS.
  • Demonstrated superior electromagnetic performance, especially with 0.2 mm line width and spacing.
  • Exhibited less than 1% performance variation after 24 hours at 800 °C, indicating high-temperature stability.
  • Provided stable responses to BTC changes within a 0-600 rpm fan motor speed range.

Conclusions:

  • The ceramic-integrated printed coil ECS offers a promising solution for accurate and stable BTC measurement.
  • This novel sensor design overcomes traditional limitations, enabling high-precision monitoring in demanding high-temperature conditions.
  • The technology supports further optimization of aero-engine electromagnetic performance and operational safety.