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In Situ Time-dependent Dielectric Breakdown in the Transmission Electron Microscope: A Possibility to Understand the Failure Mechanism in Microelectronic Devices

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Non-destructive imaging using the time domain topological energy method.

N Dominguez¹, V Gibiat

¹EADS (European Aeronautic Defence and Space Company), Innovation Works Department, 18 rue Marius Terce, 31025 Toulouse, France. nicolas.dominguez@eads.net

|September 25, 2009

Summary

The time domain topological gradient method offers a low-cost, numerically implemented approach for imaging complex structures. This technique demonstrates effective defect detection in non-destructive testing, even with noisy experimental data.

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Area of Science:

Non-destructive testing
Ultrasonic imaging
Computational electromagnetics

Background:

The time domain topological gradient (TDTG) is a novel imaging technique.
Previous work demonstrated TDTG on simulated data for complex structures.
The method combines forward and adjoint ultrasonic fields.

Purpose of the Study:

To validate the TDTG method using experimental data.
To assess the TDTG method's performance in non-destructive testing (NDT) applications.
To evaluate the method's robustness in complex configurations, such as composite materials.

Main Methods:

Utilized a numerical time reversal operation for the adjoint field.
Employed a forward ultrasonic field analogous to a "photographic developer".
Combined computed forward and adjoint ultrasonic fields to generate images.

Main Results:

Successfully applied the TDTG method to experimental NDT data.
Demonstrated the method's efficiency in imaging defects within complex structures.
Confirmed the method's effectiveness even with noisy experimental data and in challenging composite material testing.

Conclusions:

The TDTG method is efficient for non-destructive testing of complex structures.
Numerical implementation of time reversal allows for low-cost systems.
The technique shows promise for real-world applications, including composite material inspection.