圆管构件螺纹处缺陷的激光超声定位检测

搭建了激光超声检测实验平台, 采用热弹效应和激光干涉接收方式, 观测了点聚焦激发横波的指向性及内表面处缺陷对超声信号的影响, 完成了圆管工件的B-scan成像, 实现了对圆管型螺纹构件内表面裂纹的定位。结果表明, 点聚焦激光激发横波信号在作用点法向夹角为32.1°的方向上能量最强, 与理论分析相符合; 根据圆管构件B-scan成像实现了内表面裂纹的位置检测, 并结合峰值-角度变化进一步实现了缺陷宽度测量。该研究成果为激光超声工业应用推广提供了实验依据。

Abstract

An experimental platform of laser ultrasonic is built based on the thermoelastic effect and the laser interference reception method. The directivity of transverse waves generated by the incident laser and the effects of the inner surface defect on the ultrasonic signal are observed. According to the B-scan image, the defect location at the inner surface threaded part is detected. The experimental results show that the transverse wave with the largest power generated by the laser point source is in the direction of normal angle of 32.1°, which is consistent with the result of the theoretical analysis. The B-scan image combined with the peak-angle variation of the signal is used to locate the inner surface defect and to measure the defect width. This study can provide an experimental basis for industry application and popularization of laser ultrasonic.

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李海洋, 李巧霞, 王召巴, 潘强华. 圆管构件螺纹处缺陷的激光超声定位检测[J]. 激光与光电子学进展, 2018, 55(10): 101202. Li Haiyang, Li Qiaoxia, Wang Zhaoba, Pan Qianghua. Positioning Detection of Defects in Thread of Tubular Member by Laser Ultrasonic[J]. Laser & Optoelectronics Progress, 2018, 55(10): 101202.

圆管构件螺纹处缺陷的激光超声定位检测

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