Three dimensional total focusing imaging of volumetric defects using laser diffuse ultrasonic phased arrays

作者：Jun Li, Paul D. Wilcox, Jie Zhang · 发表于：Mechanical Systems and Signal Processing · 年份：2025 · DOI：10.1016/j.ymssp.2025.112673 · 被引用次数：9 · 研究领域：Ultrasonics and Acoustic Wave Propagation、Thermography and Photoacoustic Techniques、Photoacoustic and Ultrasonic Imaging

• Laser diffuse ultrasonic phased array technique for faster 3D TFM image formation. • Cross-correlating signals in the wave diffuse regime to reconstruct FMC array data. • Chirp signal excitation to eliminate the need for extensive averaging. • Superior longitudinal wave imaging with the directivity level of a laser detector. Laser-induced phased arrays (LIPAs) have been used for defect detection, offering the advantages of being non-contact and capable of coping with complex geometry and harsh environments. However, the detection speed is constrained by slow data acquisition. This is due to the extensive averaging required to suppress noise and because the number of reception sampling points at which data can be recorded in parallel is limited by the number of laser interferometers, and is typically one. Consequently, significant time is needed for data acquisition to construct a full matrix capture (FMC) array dataset, compared to using piezoelectric ultrasonic arrays. This limitation becomes particularly prominent when using high element-count two-dimensional (2D) sampling layouts for three-dimensional (3D) volumetric imaging. In this paper, we propose the laser diffuse ultrasonic phased array (LDUPA) technique as a means of acquiring FMC data from a 2D array configuration more rapidly. 3D images are then formed from the FMC data using the total focusing method. In the proposed inspection configuration, a single conventional piezoelectric transducer is employed to transmi...