摘要
针对内外径之比通常小于0.6的超高压水晶釜超声检测技术,常规的周向超声检测技术存在灵敏度低、缺陷定位困难等技术难点,同时国内外还没有相应的检测标准和成熟的检测工艺。相对于常规超声技术,相控阵技术可以在不更换探头的情况下,实现整个检测区域多角度、多方向扫查和动态聚焦检测,并结合实时成像技术,直观地显示缺陷的位置、分布、尺寸等信息。在试验研究的基础上,提出超高压水晶釜周向超声柔性相控阵检测技术,提出的柔性探头可以良好匹配超高压水晶釜圆柱表面,根据曲面形状设计聚焦法则,可以有效解决超高压水晶釜周向超声检测的技术难题。试验结果表明,柔性相控阵技术对超高压水晶釜的表面和内部缺陷均具有较高的检测精度和可靠性。
For the ultra-high pressure crystal kettle with the ratio of inner radius to outer radius less than0. 6,the conventional circumferential ultrasonic testing could not receive satisfied performance,because of the low sensitivity,locating defects difficultly. Comparing to conventional ultrasonic testing,ultrasonic phased array technology could realized the multi-angle,multi-direction scanning and dynamic focusing detection in the entire detecting region without replacement of probe and can visually display the location,distribution,size of defects utilizing the real time imaging technology. Based on the experimental study,the circumferential ultrasonic phased array technique is proposed for ultra-high pressure crystal kettle. A flexible probe is designed which can be good match to the surface of ultra-high pressure crystal kettle. The focal law is designed based on the curved shape and can effective excite the probe. The experimental result show that the flexible phased array technology proposed in this paper has high detection precision and reliability for the detection of superficial and internal defects of ultra-high pressure crystal kettle.
出处
《压力容器》
2016年第7期69-75,共7页
Pressure Vessel Technology
基金
浙江省质量技术监督系统科研计划项目(20150125)
关键词
超高压水晶釜
柔性探头
超声相控阵
超声聚焦技术
ultra-high pressure crystal kettle
flexible probe
ultrasonic phased array
ultrasonic focusing technology
