相控阵检测技术聚焦深度对检测结果的影响

Effect of Focus Depth on Test Results by Ultrasonic Phased Array Inspection

超声相控阵聚焦能将超声能量聚焦于被检区域,使检测结果更加明显,但缺陷定量结果受相控阵仪器聚焦深度的设置影响较大。利用超声相控阵技术,通过真实深度聚焦模式对深度分别为4、9、13、18、23、29、35 mm的Φ2 mm横通孔进行检测。结果表明:当聚焦深度与缺陷孔深相同时,孔深和孔径测量值误差可达最小值;在孔深前后大约5 mm范围内进行聚焦时,使用相控阵检测方法对缺陷的定位定量相对较为准确,可以将误差控制在1 mm内。

Ultrasonic phased array focusing ultrasonic energy on the inspected area to make the test results more obvious. The focus depth setting had great influence in defect quantification. This paper had detected the Φ2mm drill holes of different depth like 4,9,13,18,23,29,35 mm by using ultrasonic phased array scanning technology. As per the test result,when focus depth setting equal to the hole depth,the tolerance of the hole depth and the hole aperture will be 迷你 mum. When the focusing zone in which ultrasonic beam energy concentrated is approximately 5mm front and after the focusing point setted,and the detecting and sizing the defect has better accuracy. The deviation could be controlled in the range of 1mm.