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Channel consistency calibration of planar eddy current sensor arrays

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Planar eddy current sensor arrays have several advantages, including good coherence, fast response speed and high sensitivity, which can be used for defect inspection of crucial parts in mechanical equipment. A key step to improve the detection performance is to ensure the channel consistency of the planar eddy current sensor arrays. The principles and characteristics of planar eddy current sensor arrays are described in this paper and the channel consistency calibration algorithm is investigated based on the least squares principle. An experimental system is established based on a field-programmable gate array (FPGA) and an ARM processor and is utilised to inspect the defects in aluminium alloys. The multiple-channel data from before and after calibration are compared and the effect of three artificial defects on the detection capability is illustrated when the channel consistency calibration of the sensor arrays is implemented. The experimental results show that the channel consistency and the repeatability of the sensor arrays are improved remarkably after calibration. The defect testing results show that the calibration algorithm has greatly improved the performance of the testing system based on planar eddy current sensor arrays.
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Keywords: 3D IMAGE; CONSISTENCY CALIBRATION; LEAST SQUARES; NON-DESTRUCTIVE TESTING (NDT); PLANAR EDDY CURRENT SENSOR ARRAY

Document Type: Research Article

Publication date: September 1, 2018

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