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%.