ibg's Simultaneous Harmonic Analysis (iSHA) for Advanced Eddy Current Structure Testing
10/27/2025
Limitations of Traditional Signal Processing in Structure Testing
Ensuring steel components meet the highest quality standards starts with verifying heat treatment results, including proper case depth and hardness. This process is especially important for safety-critical parts in the automotive and aerospace sectors. Traditional signal processing methods can merely evaluate one basic frequency or one harmonic in eddy current signals.
Thus, these approaches fall short when dealing with complex defect patterns or dynamic test signals, typical of real-world testing scenarios.
iSHA: Efficient Analysis of Complex ECT Signals
iSHA (ibg’s Simultaneous Harmonic Analysis) evaluates 8 fundamental frequencies and their harmonics simultaneously, guaranteeing maximal test sensitivity and time efficiency. It is particularly well-suited for eddy current structure tests of several possible kinds of defects, analyzing the complex ECT signals and their multiple fundamental waves and harmonics components.
Enhanced Eddy Current Structure Testing with iSHA and PMFT
In ibg’s eddyvisor S system for microstructure testing, iSHA is paired with ibg’s proven Preventive Multi-Frequency Testing to deliver maximum reliability of testing. The received signals are digitized immediately after the input amplifier and efficiently processed very fast by the system’s digital signal processors (DSP).
This powerful combination enhances sensitivity, improves defect characterization, and enables precise differentiation between defect types.
A Powerful Combination: iSHA, iPMFT and AI
The signals analyzed by iSHA and iPMFT are so comprehensive that, with the help of AI, they can even be used to predict the hardening depth in induction hardening, for example.
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