Vector imaging of an in-plane electric current using a planar magneto-optical sensor

Area of Science:

• Physics
• Materials Science
• Electrical Engineering

Background:

• Visualizing electric current distributions is crucial for understanding electronic device performance.
• Existing methods may suffer from noise or limitations in real-time display.
• Magneto-optical (MO) sensors offer a non-contact method for probing magnetic fields generated by currents.

Purpose of the Study:

• To propose and demonstrate a novel imaging technique for visualizing in-plane electric current vector distributions.
• To adapt existing methods for a planar magneto-optical sensor and enable prompt display.
• To optimize the technique for improved signal-to-noise ratio and dynamic range.

Main Methods:

• Utilizing a plate-shape magneto-optical (MO) sensor for current visualization.
• Developing an original algorithm based on Roth et al.'s method, adapted for planar sensors.
• Avoiding Fourier domain division to suppress noise enhancement.
• Evaluating signal-to-noise ratio and dynamic range performance.

Main Results:

• Successful demonstration of the proposed imaging technique.
• Implementation of an algorithm that avoids Fourier domain division for noise reduction.
• Evaluation of the technique's signal-to-noise ratio and dynamic range.
• Discussion of the influence of MO sensor characteristics on imaging performance.

Conclusions:

• The developed MO sensor imaging technique effectively visualizes in-plane electric current vectors.
• The modified algorithm enhances noise suppression and is suitable for prompt display.
• The technique shows promise for analyzing current distributions in various electronic applications.