A lift-off measurement and compensation method based on a comprehensive EMAT-PEC probe

Duan, Zhaoqi; Guo, Yizhou; Cheng, Si; Kang, Yihua; Hu, Yu; Chen, Yanting; Li, Yannong; Feng, Bo

doi:10.1016/j.sna.2024.115319

Sensors and Actuators A: Physical

2024

DOI: 10.1016/j.sna.2024.115319

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A lift-off measurement and compensation method based on a comprehensive EMAT-PEC probe

Zhaoqi Duan,

Yizhou Guo,

Si Cheng

et al.

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2024

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Cited by 2 publications

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Bottom Crack Detection with Real-Time Signal Amplitude Correction Using EMAT-PEC Composite Sensor

Guo,

Hu,

Wang

et al. 2024

Sensors

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During electromagnetic ultrasonic testing, it is difficult to recognize small-size bottom cracks by time of flight (ToF), and the lift-off fluctuation of the probe affects the accuracy and consistency of the inspection results. In order to overcome the difficulty, a novel composite sensor of an electromagnetic acoustic transducer (EMAT) and pulse eddy current (PEC) is designed. We use the amplitude of a bottom echo recorded by EMAT to identify the tiny bottom crack as well as the amplitude of PEC signals picked up by the integrated symmetric coils to measure the average lift-off of the probe in real time. Firstly, the effects of lift-off and bottom cracks on the amplitude of bottom echo are distinguished by combining the theoretical analysis and finite element method (FEM). And then an amplitude correction method based on the fusion of EMAT and PEC signals is proposed to reduce the impact of lift-off on the defect signal. The experimental results demonstrate that the designed composite sensor can effectively detect a bottom crack as small as 0.1 mm × 0.3 mm. The signal fusion method can accurately correct the amplitude of defect signals and the relative error is less than ±8%.

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Bottom Crack Detection with Real-Time Signal Amplitude Correction Using EMAT-PEC Composite Sensor

Guo,

Hu,

Wang

et al. 2024

Sensors

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Design and Study of Pulsed Eddy Current Sensor for Detecting Surface Defects in Small-Diameter Bars

Han,

Jiang,

Yuan

2024

Sensors

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The design and study of pulsed eddy current sensors for detecting surface defects in small-diameter rods are highly significant. Accurate detection and identification of surface defects in small-diameter rods may be attained by the ongoing optimization of sensor design and enhancement of detection technologies. This article presents the construction of a non-coaxial differential eddy current sensor (Tx-Rx sensor) and examines the detection of surface defects in a small diameter bar. A COMSOL 3D model is developed to examine the variations in eddy current distribution and defect signal characteristics between the plate and rod components. The position of the excitation coil on the bar and the eddy current disruption around the defect are examined. Additionally, a Tx-Rx sensor has been developed and enhanced concerning coil dimensions, coil separation, and elevation height. An experimental system is established to detect bar structures with surface defects of varying depths, and a model correlating differential signal attenuation with defect depth is proposed, achieving a quantitative relative error of less than 5%, thereby offering a reference for the quantitative detection of bar surface defects.

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A lift-off measurement and compensation method based on a comprehensive EMAT-PEC probe

Cited by 2 publications

References 35 publications

Bottom Crack Detection with Real-Time Signal Amplitude Correction Using EMAT-PEC Composite Sensor

Bottom Crack Detection with Real-Time Signal Amplitude Correction Using EMAT-PEC Composite Sensor

Design and Study of Pulsed Eddy Current Sensor for Detecting Surface Defects in Small-Diameter Bars

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