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This paper proposes a noncontact internal defect imaging method for cylindrical components, and an automatic photoacoustic testing platform is built. A synthetic aperture focusing technology in the polar coordinate system based on laser ultrasonic (LU-pSAFT) is established, and the relationship between the imaging quality and position of discrete points is analyzed. In order to verify the validity of this method, small holes of \u03a60.5 mm in the aluminum alloy rod are tested. During the imaging process, since a variety of waveforms can be excited by the pulsed laser synchronously, the masked longitudinal waves reflected by small holes need to be filtered and windowed to achieve high-quality imaging. In addition, the influence of ultrasonic beam angle and signal array spacing on imaging quality is analyzed. The results show that the method can accurately present the outline of the small hole, the circumferential resolution of the small hole is less than 1\u00b0 and the dimensional accuracy and position error are less than 0.1 mm.<\/jats:p>","DOI":"10.3390\/s23156803","type":"journal-article","created":{"date-parts":[[2023,7,31]],"date-time":"2023-07-31T03:30:02Z","timestamp":1690774202000},"page":"6803","update-policy":"https:\/\/doi.org\/10.3390\/mdpi_crossmark_policy","source":"Crossref","is-referenced-by-count":2,"title":["Research on Photoacoustic Synthetic Aperture Focusing Technology Imaging Method of Internal Defects in Cylindrical Components"],"prefix":"10.3390","volume":"23","author":[{"given":"Yanjie","family":"Zhang","sequence":"first","affiliation":[{"name":"College of Mechanical and Vehicle Engineering, Taiyuan University of Technology, Taiyuan 030024, China"},{"name":"Engineering Research Center of Advanced Metal Composites Forming Technology and Equipment, Ministry of Education, Taiyuan University of Technology, Taiyuan 030024, China"},{"name":"National Key Laboratory of Metal Forming Technology and Heavy Equipment, Taiyuan University of Technology, Taiyuan 030024, China"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Tianyou","family":"Li","sequence":"additional","affiliation":[{"name":"College of Mechanical and Vehicle Engineering, Taiyuan University of Technology, Taiyuan 030024, China"},{"name":"Engineering Research Center of Advanced Metal Composites Forming Technology and Equipment, Ministry of Education, Taiyuan University of Technology, Taiyuan 030024, China"},{"name":"National Key Laboratory of Metal Forming Technology and Heavy Equipment, Taiyuan University of Technology, Taiyuan 030024, China"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Hongkai","family":"Chen","sequence":"additional","affiliation":[{"name":"College of Mechanical and Vehicle Engineering, Taiyuan University of Technology, Taiyuan 030024, China"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Zhihui","family":"Xu","sequence":"additional","affiliation":[{"name":"College of Mechanical and Vehicle Engineering, Taiyuan University of Technology, Taiyuan 030024, China"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Xinyao","family":"Li","sequence":"additional","affiliation":[{"name":"College of Architecture, Taiyuan University of Technology, Taiyuan 030024, China"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Wangzhe","family":"Du","sequence":"additional","affiliation":[{"name":"College of Mechanical and Vehicle Engineering, Taiyuan University of Technology, Taiyuan 030024, China"},{"name":"Engineering Research Center of Advanced Metal Composites Forming Technology and Equipment, Ministry of Education, Taiyuan University of Technology, Taiyuan 030024, China"},{"name":"National Key Laboratory of Metal Forming Technology and Heavy Equipment, Taiyuan University of Technology, Taiyuan 030024, China"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Yaxing","family":"Liu","sequence":"additional","affiliation":[{"name":"College of Mechanical and Vehicle Engineering, Taiyuan University of Technology, Taiyuan 030024, China"},{"name":"Engineering Research Center of Advanced Metal Composites Forming Technology and Equipment, Ministry of Education, Taiyuan University of Technology, Taiyuan 030024, China"},{"name":"National Key Laboratory of Metal Forming Technology and Heavy Equipment, Taiyuan University of Technology, Taiyuan 030024, China"}],"role":[{"vocabulary":"crossref","role":"author"}]}],"member":"1968","published-online":{"date-parts":[[2023,7,30]]},"reference":[{"key":"ref_1","doi-asserted-by":"crossref","first-page":"102321","DOI":"10.1016\/j.ndteint.2020.102321","article-title":"Laser ultrasonics for defect evaluation on coated railway axles","volume":"116","author":"Montinaro","year":"2020","journal-title":"NDT E Int."},{"key":"ref_2","doi-asserted-by":"crossref","first-page":"990","DOI":"10.1177\/1475921720953058","article-title":"A novel baseline-free approach for acousto-ultrasonic crack monitoring of rotating axles","volume":"20","author":"Reitz","year":"2021","journal-title":"Struct. 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