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Measurement of current distribution using infrared thermography.

Chao Ren1, Libing Bai1, Ruilong Shi2

  • 1School of Automation Engineering, University of Electronic Science and Technology of China, Chengdu 611731, China.

The Review of Scientific Instruments
|April 4, 2023
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Summary

This study introduces a novel non-contact infrared thermography method for high-resolution current distribution imaging. The technique accurately measures current amplitude and direction, improving upon existing methods for various applications.

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Area of Science:

  • Electrical Engineering
  • Non-destructive Testing
  • Thermal Imaging

Background:

  • Current distribution measurement is vital for medical, semiconductor, and structural integrity applications.
  • Existing methods like electrode arrays and magnetic sensors lack high spatial resolution.
  • A need exists for non-contact, high-resolution current distribution imaging techniques.

Purpose of the Study:

  • To propose and validate a non-contact current distribution measurement method using infrared thermography.
  • To achieve high spatial resolution in current distribution imaging.
  • To accurately quantify current amplitude and reconstruct current direction.

Main Methods:

  • Utilizing thermal variations detected by infrared thermography to quantify current amplitude.
  • Reconstructing current direction based on electric field passivity.
  • Employing calibration fitting for low-frequency current quantification and first-order derivative for high-frequency estimation.

Main Results:

  • Accurate current amplitude measurement demonstrated, with relative error ±3.66% at 50 Hz (1.05-3.45 A) using calibration fitting.
  • Effective high-frequency current amplitude estimation achieved using temperature variation derivative.
  • High-resolution 2D current distribution images obtained, verified by eddy current detection (256 KHz) and simulations.

Conclusions:

  • The proposed infrared thermography method offers accurate current amplitude measurement.
  • The technique significantly enhances spatial resolution for 2D current distribution imaging.
  • This non-contact approach provides a valuable advancement for current distribution analysis.