Design And Realization Of Ultrasonic Data Acquisition Module For Seabed Pipelines Detection

This research is one of the most important parts of the national 863 key project–"Robot and Detection technology in seabed oil pipeline". The main task of this research is to develop a module based on ARM and FPGA to fulfill the data acquisition and storage for the pipeline flaw signals during the ultrasonic online detection.This thesis firstly introduces the ultrasonic detection principles briefly,and then analyzes and calculates the technical parameters of this project according to engineering machine's performance. Thus,it determines the 5MHz central frequency of the ultrasonic probes, the 40MHz sampling frequency of the A/D, the 73GB total storage data and four simultaneous sampling channels.In view of the high frequency,high speed and large volume data of ultrasonic signals,the thesis has developed a data acquisition module for the online ultrasonic detection device based on ARM and FPGA.The whole data aqusition module contains four bandwidth filters, whose bandwidth frequency is 3MHz and central frequency is 5MHz,and a logical control and data pretreatment module runned on FPGA.In addition,the further denoising,compressing and storage module for ultrasonic sampling signals...