Eddy-Current Measurements of Corrosion-Related Thinning in Aluminium Lap Splices

Recent Developments of Eddy Current Inspection Simulator

“…It is an ideal example, therefore, for illustrating the basic nature of eddy current phenomena to non-experts. Furthermore, the model has been proven useful in practical applications of layer-sizing and corrosion detection algorithms via the swept-frequency method [5,6]. It was this modelthat was first incorporated into the simulator.…”

“…4), or, optionally, can be sent to a file. Figure 4 actually contains important physical results, the key feature to the sweptfrequency corrosion detection approach [5,6]. Notice the characteristic zero-crossing of the real parts in Fig.…”

Pulsed Eddy-Current Measurements of Corrosion-Induced Metal Loss: Theory and Experiment

“…In contrast, ultrasonic techniques require a mechanical bond between layers for the ultrasonic energy to penetrate to the second or third layers. Both time-domain [1,2] (pulsed) and frequency-domain [3,4] (continuous wave) methods are under development.…”

“…Since pulsed signals contain a broad range of frequencies, their information content is inherently greater than conventional single-or dual-frequency signals. In this way, they are akin to sweptfrequency measurement methods [3], which sample a large number of frequencies. Yet the pulsed eddy-current technique is much faster: 100 milliseconds to acquire a pulsed eddycurrent signal compared to several minutes to complete a swept-frequency measurement.…”

A New Electromagnetic Instrument for Thickness Gauging of Conductive Materials

“…Eddy current techniques are widely used to measure the thickness of electrically conducting materials [1][2][3]. The approach, however, requires an extensive set of calibration standards and can be quite time consuming to set up and perform.…”