摘要
为减少管道超声导波检测中频散现象给检测工作带来的不利影响,提出了一种针对管道的超声导波激励信号源的设计方法,采用超高速单片机DS89C430、数模转换器件AD9708和运算放大器LM318等器件,设计出专门用于激励超声导波的汉宁窗调制单音频信号的窄带信号发生器,该信号发生器可实现汉宁窗的宽度可调,汉宁窗调制下的单音频信号频率可调的功能。实验结果表明设计合理,激励信号中单音频的频率及汉宁窗调制单音频的周期数调节方便。
A design method of signal source for exciting ultrasonic guided wave in the pipe was presented, for reducing the adverse effects of dispersive phenomena in pipeline ultrasonic guided wave inspection, using uhra-high-speed microcontroller DS89C430, digital-analog converter （DAC） device AD9708, operational amplifier （OP） LM318 and other devices, a narrow-band signal generator which can generate single acoustic frequency signal modulated by Harming window is deugned, the generator is devoted to excite ultrasonic guided wave, both the width of Hanning window and the frequency of single acoustic frequency signal are adjustable. Results show that the design is reasonable, the frequency of single acoustic frequency and the cycles＇s number of the single acoustic frequency modulated by Hanning window are all adjustable easily.
出处
《电子设计工程》
2010年第10期136-138,141,共4页
Electronic Design Engineering
