针对现有的管道缺陷超声阵列检测技术发射声能低、小缺陷检出率低以及电路结构复杂的问题，设计了一种8通道阵列收发电路.发射电路采用单片机控制发射电路产生时序和重复频率均可调的8路高压窄脉冲，实现阵列的激发.接收电路采用数控模拟多路复用器，实现接收电路的分时复用.将该阵列电路用于管道试样检测中，能够检测出直径2mm、高3.6mm的平底孔和长×宽×高为10mm×0.5mm×1.5mm的裂纹，测量壁厚的平均误差达到0.51%，且电路稳定可靠.
关键词：
; 管道检测; 超声; 小缺陷; 阵列电路
A novel 8channel array emitting and singlechannel receiving circuit is designed to solve the problems of low acoustic emission energy, low tiny flaw detection rate and complex circuit structure for pipeline flaw ultrasonic array detection. A singlechipmicrocomputer is applied to generate 8channel control signals for emission circuit stimulating adjustable time sequence and repetition frequency. Then, the transducers are stimulated by the 8channel highvoltage narrow pulses. A multiplexer is used in receiving circuit for echo signal time sharing multiplex. The designed array circuit is applied to pipeline sample ultrasonic testing. Artificial flatbottom hole with 2mm diameter and 3.6mm height and crack with 10mm length, 0.5mm width and 1.5mm height are inspected by using the designed circuit. In the experiments, wall thickness is also measured with an average relative error of 0.51%. Testing results show that the circuit is stable and reliable.
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