储氢钢瓶的在线水浸聚焦相控阵自动超声检测

Online automatic phased array ultrasonic detection of hydrogen storage cylinder in water immersion

传统的储氢钢瓶在线自动检测通常采用水浸点聚焦或线聚焦的超声检测方法,但点聚焦检测速度受到一定限制,线聚焦的检测灵敏度和分辨力比点聚焦的差。提出了带凹面声透镜的相控阵检测技术,通过凹面声透镜水浸耦合实现超声波在钢瓶截面方向的聚焦。利用CIVA软件对带凹面声透镜的相控阵探头辐射声场进行仿真分析,并根据仿真结果设计了相控阵探头参数,在此基础上开发了一套针对储氢钢瓶的五轴联动相控阵超声水浸C扫描自动检测系统,利用相控阵电子扫描技术快速规划超声检测路径和重构曲面。利用该检测系统,对带有人工缺陷的试件进行检测试验。试验结果表明:该方法融合了水浸点聚焦和线聚焦两种方法的优点,能够实现储氢钢瓶轴向和周向缺陷的自动在线超声检测。

The conventional online automatic detection of hydrogen storage steel cylinders typically utilizes the water-immersion ultrasonic testing technology with point or line focusing method.However,the point focusing method has slow detection speed,and the line focusing method has low sensitivity and resolution.This paper proposes a phased array detection technology utilizing a concave acoustic lens that combined water-immersion to focus ultrasound in the radial direction of the steel cylinder.The radiated sound field of the phased array probe with a concave acoustic lens was simulated and analyzed by CIVA.The phased array probe parameters were optimized in accordance with the simulation results.Based on this,a five-axis linkage ultrasonic phased array water-immersion C-scan automatic detection system for hydrogen storage steel cylinders was developed.The system quickly planed the path of ultrasonic testing and reconstructed surface through electronic scanning technology of phased array.The system was tested using a hydrogen storage steel cylinder with artificial defects.The results showed that the proposed system,combining the advantages of the point focusing and line focusing methods,can achieve automatic online ultrasonic detection of axial and circumferential defects in hydrogen storage steel cylinders.