Total Focusing Method Imaging for Oblique Incidence Test using Linear Transmit-receive Longitudinal Phased Array Probe

doi:10.3901/JME.2025.20.040

Abstract

Abstract: Total focusing method is widely used in the field of ultrasonic non-destructive testing due to its high defect resolution and detection sensitivity. In order to avoid the influence of the near-field region of the probe in the total focusing imaging and ensure that the detected area can be effectively detected, and further improve the imaging quality, an oblique incidence dual-line array phased array probe total focusing imaging method is proposed. The total focusing method is combined with the dual-line array phased array probe, and the defect detection is realized by improving the total focusing imaging algorithm. The aluminum and brass test blocks were collected by full-matrix capturing using dual-line array phased array probes with different roof angles, and the total focusing image reconstruction was performed. The imaging results were compared with the results of single-line array oblique incidence total focusing imaging. The results show that in the detection of brass test blocks and aluminum test blocks, the oblique incidence defect imaging API values of the dual-line array with roof angles of 2.5° and 5° are 0.8 and 0.6 lower than those of the single-line array oblique incidence defect imaging API values. The SNR values are up to 9.7 dB and 11.1 dB, and the maximum amplitude values are 21.6 dB and 23.9 dB higher. The Total focusing method of oblique incidence transmit-receive phased array probe is more suitable for the stratified detection of wedges with suitable roof angles in different areas and the defect detection of coarse crystal materials.

Key words: linear transmit-receive longitudinal, phased array, total focusing method, oblique incidence, imaging

CLC Number:

TG115

CHEN Yao, MA Xiaoxiao, LU Chao, HE Xi, CHI Jiapeng, CHEN Ming, XIONG Zhenghui, LI Qiufeng. Total Focusing Method Imaging for Oblique Incidence Test using Linear Transmit-receive Longitudinal Phased Array Probe[J]. Journal of Mechanical Engineering, 2025, 61(20): 40-48.

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