New Electromagnetic Sensors for Detection of Subsurface Cracking and Corrosion

Development of Very Low Frequency Self-Nulling Probe for Inspection of Thick Layered Aluminum Structures

“…Giant magneto-resistive sensors have several advantages over the competing technologies for applications to low frequency eddy-current testing [3][4][5]. The devices are small, low cost, highly sensitive, operate at room temperature, and require minimal instrumentation.…”

Tilt-shift eddy current probe impact on information value of response signal

“…Secondary EM field counteracts the cause of its formation, interacts with primary EM field and causes the formation of the electromagnetic coupling, shown in Figure 1. Any change in the electromagnetic parameters of conductive material causes a change in the flow of induced eddy currents, which affects the resulting EM field and coil impedance, which is measurable, [4,[6][7][8]. The ECT method has several requirements that must be secure to properly measure such as suitable frequency, the geometry of the material and placing of the ECT probe, offset, electromagnetic properties, preventing unwanted movement of probe and vibrations.…”

Deep flaw detection with giant magnetoresistive (GMR) based self-nulling probe

“…The use of giant magnetoresistive (GMR) sensors for electromagnetic nondestructive evaluation has grown considerably in the last few years [1][2][3][4]. Technological advances in the research and development of giant magnetoresistive materials has led to commercially available GMR sensors with many qualities well suited for electromagnetic NDE.…”