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In the aviation in-situ eddy current non-destructive testing (ECNDT), there are increasing requirements for speediness, intelligence and integration. The signal conditioning bridge ciruit is one of the most important parts for realizing the requirements. This work proposes an approach to develop a novel digitally controlled bridge (DCB), which is based on relay arrays. It is used for impedance signal...
In pulsed eddy current testing, repetitive excitation signals with different parameters: duty-cycle, frequency and amplitude have different response representations. This work studies the influences of different excitation parameters on pulsed eddy current testing for deep-layered defects detection of stratified samples with rectangular sensor. The sensor had been proved to be superior in quantification...
Multi-frequency eddy current test (MFECT) is an important NDT technology, and it can be applied to realize multi-parameter detection and interference elimination effectively. Aiming at the problem that conventional single-frequency eddy current test can only identify defects but can't classify defects effectively, a new MFECT technology which adopts LFM signal exciting and spectrum analysis method...
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