【摘要】 超声相控阵检测技术是利用脉冲反射法对被检构件中是否存在缺陷(如裂纹、夹杂、气孔等)进行无损检测,阵列换能器是该检测技术中实现电-声转换的传感器件,其声场特性是能否获得并有效利用被检测部位或区域回波信息的决定因素,也是设计换能器阵的主要依据。从平面矩形活塞阵元的辐射声场出发,利用简便算法对阵元辐射声场、一维线阵辐射声场进行了仿真模拟,分析了影响阵列换能器性能的几个主要因素,提供了阵列换能器的设计思路,并对采用相控阵超声换能器与常规超声换能器探测人工缺陷时的扫查波形进行了比较。更多还原

【Abstract】 Using pulse-echo method, the defects of inspected specimens, such as cracks, inclusions, porosities (et al,) can be tested with ultrasonic phased array technique. Phased array transducer can realize the conversion between sound wave and electric signal, its characteristic of acoustic field is the most important factor whether the echo information of the inspected area in a specimen can be obtained and utilized effectively, and it is the main basis of designing a phased array. Based on a radiating acoustic field of a rectangle piston transducer, a (simple) algorithm is used to simulate the acoustic field of a single rectangle piston transducer and a linear phased array transducer. By analyzing problems generated in a linear phased array design, the basic design method is provided. With an ultrasonic phased array transducer and a conventional ultrasonic transducer, the scan beam profiles of the artificial defects are compared.更多还原