How can multi excitation coils in eddy current testing?
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Multi excitation coils in eddy current testing are used to improve the accuracy and sensitivity of defect recognition. The use of multi-turn conductive coils energized by AC currents with phase differences allows for the generation of an excitation field . This excitation field interacts with the object being inspected, creating magnetic fields that can be detected by magnetic field sensors positioned in proximity to the object . By acquiring induction voltage signals at different excitation frequencies and performing gradient transformation on the phase values, the position of defects in the object can be determined . Additionally, the use of multi-frequency signal generating modules in the excitation coil and an array of planar eddy current receive coils enhances the performance of the eddy current testing system, allowing for simultaneous detection of cracks at different depths .
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