PBX内部裂纹水浸超声全聚焦成像方法研究

Water Immersion Ultrasonic Total Focusing Method for Internal Cracks in PBX

高聚物粘结炸药(PBX)的内部裂纹检测对其使用安全性和结构完整性评价具有重要意义和工程应用价值。为了提高PBX内部裂纹缺陷的成像检测精度和图像质量,研究了曲面修正水浸超声全聚焦成像方法,并在此基础上进一步结合了延迟乘和波束形成(DMAS)技术,通过水浸法对Φ100.0 mm的半圆柱PBX的底部裂纹缺陷进行了超声成像检测研究,实现了对曲面构形PBX底部裂纹缺陷的高精度成像表征。实验结果表明,传统全聚焦成像算法的裂纹缺陷高度测量误差为12.0%,图像信噪比为1.37 dB;曲面修正后的裂纹缺陷高度测量误差为3.6%,图像信噪比为2.13 dB;而曲面修正结合DMAS算法成像的裂纹缺陷高度测量误差仅为0.4%,图像信噪比为5.32 dB。

The internal crack detection of polymer bonded explosive(PBX)is of great significance and engineering application value for its safety and structural integrity evaluation.In order to improve the imaging detection accuracy and image quality of PBX internal crack defects,the curved surface modified water immersion ultrasonic total focusing imaging method was proposed.On this basis,the delay multiply and sum(DMAS)technology was further combined.The ultrasonic imaging detection of the bottom crack defects of theΦ100.0 mm semi‑cylindrical PBX was studied by water immersion method,and high‑precision imaging characterization and high signal‑to‑noise ratio imaging of this bottom crack defect of the curved PBX was realized.The experimental results show that the crack defect height measurement error of the traditional TFM imaging algorithm is 12.0%,and the image signal‑to‑noise ratio is 1.37 dB.The height measurement error of this crack defect after surface correction is 3.6%,and the image signal‑to‑noise ratio is 2.13 dB.The crack defect height measurement error of the surface correction algorithm com‑bined with DMAS is only 0.4%,and the image signal‑to‑noise ratio is 5.32 dB.