Design and Research of large pulse power ultrasonic guided waves excitation circuit

摘要

In order to incentive ultrasonic guided waves and realized to locating detection of pipelines' defects and dilaceration, this article designed a bridge type power amplifier of signal energized circuit base on FPGA, the frequency of energized circuit ranged from 0 to 200 kHz, the number of pulse period can be selected between 3-10, and the initial interval of pulse train ability to 20ms, bridge power amplifier circuit is able to output 500V peak value of positive and negative square wave voltage, signal source power can reach to 1000w. Experimental results showed that the design of this ultrasonic energized circuit's hardware and soft ware is reasonable, the services out put stable and high precision signal, it also has small volume and easy to use, which is beneficial to the popularization and application of ultrasonic guided waves detection.