High signal-to-noise ratio eddy thermal imaging detection method based on direction modulation
A technology with high signal-to-noise ratio and direction modulation, which can be used in material defect testing and other directions to solve problems such as poor detection results.
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[0020] Embodiment 1
[0021] The structure of the eddy current thermal imaging system is as figure 1 As shown, there is a crack 2 on the metal sample 1, the excitation coil 3 is wound on the ferrite core 4, the alternating current is provided by the high-power high-frequency power supply 5, and the thermal imager 6 is located above the sample. Observe the induction heating area , The software on the computer 7 controls the start and stop of the power supply 5, and at the same time collects the data of the thermal imager 6 for processing, analysis and result display. The excitation coil 3 and the ferrite core 4 are composed of two sets of coils and cores whose excitation directions are perpendicular to each other. The structure is as follows: figure 2 As shown, the U-shaped magnetic core 4A is wound with a coil 3A, and the U-shaped magnetic core 4B is wound with a coil 3B. The induced eddy currents generated by the coil 3A and the coil 3B on the sample surface are substantially pe...
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