导波检测用激励源的设计及应用

研制出一种用AD9833和模拟乘法器MC1496合成产生信号,用单片机控制的导波检测用信号发生器。该信号发生器可根据实际检测条件进行频率、加窗形状、窗体宽度、猝发间隔程控修改等操作。运用该仪器研究分析了特定条件下不同频率,不同脉宽的激励信号的回波信号,确定了检测的最佳频率为100kHz以上,宽度为4个脉冲。运用该仪器的导波检测系统能检测出来5%缺损面积的缺陷,定位精度可达5%。

Design and Appalication of stimulant signal generator used for Guide Wave testing

With AD9833 and analog multiplier MC1496, we designed the signal generator ,which controlled by single chip, The frequency, the shape of the windows, the width of the windows, and the delay-time of the plus of the generator can change by programmed controlling. Using the generator, we studied the echo wave signal of the guide wave in various frequency, various plus-width prompting plus, and confirmed the optimal frequency is above 100kHz, the optimal width is 4-plus. Appling this generator, the guide wave testing system can detect 5% loss of the metallic area, and its distance position precision can reach 5%.