Composite primary structures that can sustain high loads are used to reduce the weight of structures in various industries. Composite primary structures that are L-shaped or T-shaped have a right-angled corner, and phased-array ultrasonic inspection or water squirt robotic C-scan is mainly used for the corners. However, using a customized transducer has restrictions depending on the size and shape of the corner. In this paper, we propose a novel approach based on rotational laser ultrasonic inspection for even narrow corner sections regardless of size and angle. In the rotational scanning method, the target structure is rotated for inspection, which is different from conventional scanning methods in which transducers or a scanning head are moved along the inspection area. The rotational scanning method is designed to solve the problem of signal-to-noise ratio deterioration that occurs when the ultrasonic sensing laser scans a curved surface. The corner sections of two L-shaped specimens fabricated by autoclave curing and resin transfer molding were inspected using the rotational scanning method. Using the proposed method, all of the artificial defects inserted into the corner section of the specimens were clearly visualized. Then, the inspection results were compared with water squirt C-scan inspection results. The test results showed that the proposed method is highly reliable and useful for inspecting the corner sections.

可以承受高载荷的复合主结构用于减轻各个行业的结构重量。L形或T形的复合主结构有一个直角，相控阵超声检测或喷水机器人C-scan主要用于角部。但是，根据拐角的大小和形状，使用定制的换能器会受到限制。在本文中，我们提出了一种基于旋转激光超声波检测的新方法，适用于即使是狭窄的角落部分，无论大小和角度如何。在旋转扫描方法中，目标结构被旋转以进行检查，这不同于传统的扫描方法，其中换能器或扫描头沿着检查区域移动。旋转扫描法是为了解决超声波传感激光扫描曲面时信噪比恶化的问题而设计的。使用旋转扫描方法检查通过高压釜固化和树脂传递成型制造的两个 L 形试样的角部分。使用所提出的方法，所有插入试样角部的人工缺陷都清晰可见。然后，将检查结果与喷水 C 扫描检查结果进行比较。测试结果表明，所提出的方法是高度可靠的，可用于检测角部。使用旋转扫描方法检查通过高压釜固化和树脂传递成型制造的两个 L 形试样的角部分。使用所提出的方法，所有插入试样角部的人工缺陷都清晰可见。然后，将检查结果与喷水 C 扫描检查结果进行比较。测试结果表明，所提出的方法是高度可靠的，可用于检测角部。使用旋转扫描方法检查通过高压釜固化和树脂传递成型制造的两个 L 形试样的角部分。使用所提出的方法，所有插入试样角部的人工缺陷都清晰可见。然后，将检查结果与喷水 C 扫描检查结果进行比较。测试结果表明，所提出的方法是高度可靠的，可用于检测角部。