Ultra-Multiple-Point Laser Scanning 3D Ultrasonic Imaging Method for Challenging to Improve Reliability of Actual Structures and Elucidate Defect Generation Mechanisms

2021 Fiscal Year Final Research Report

• Project/Area Number: 19K21910
• Research Category: Grant-in-Aid for Challenging Research (Exploratory)
• Allocation Type: Multi-year Fund
• Review Section: Medium-sized Section 18:Mechanics of materials, production engineering, design engineering, and related fields
• Research Institution: Tohoku University
• Principal Investigator: Ohara Yoshikazu 東北大学, 工学研究科, 准教授 (90520875)
• Co-Investigator(Kenkyū-buntansha): 三原 毅 東北大学, 工学研究科, 教授 (20174112) ; 辻 俊宏 東北大学, 工学研究科, 助教 (70374965)
• Project Period (FY): 2019-06-28 – 2022-03-31
• Keywords: 超音波探傷 / 非破壊評価 / フェーズドアレイ / レーザドップラー振動計 / 3次元映像

Outline of Final Research Achievements

Cracks in power plants, trains, rockets, and automotive components have complex 3D geometries. If 3D imaging of internal defects in actual structures is achieved, it will enable to ensure the reliability of actual structures based on accurate 3D defect geometry and will also lead to the elucidation of the defect generation mechanism in them. However, ultrasonic imaging methods applicable in the field have been limited to 2D imaging, even with the latest ultrasonic phased array. In this study, we challenged creating a high-resolution 3D ultrasonic imaging method based on ultra-multiple-point laser 2D scan and large-amplitude ultrasonic transmission technology and established the fundamentals for this method.

Free Research Field

材料計測評価学

Academic Significance and Societal Importance of the Research Achievements

発電プラント、鉄道車両、ロケット、自動車部材などに発生する「き裂」は、複雑な3次元形状を有する。実構造物の内部欠陥の3次元映像化が実現されれば、正確な3次元欠陥形状に基づくより高度な信頼性保証が可能となり、さらには実構造物の欠陥発生機構解明にもつながることが期待できる。本研究で基盤を確立した「超多点レーザ走査3D超音波映像法」は、実構造物に適用可能な世界初の高分解能3D映像法として、様々な分野での活用が期待される。