Research And Design On Multicentre And Automative Ultrasonic Detection System

At present, the distance of the pipelines running in the industry of oil refining, petrol-chemistry and electricity in China is around 500,000 kilometres. The majority of them last one or two decades, gradually resulting in the summit of accidents with various degrees of erosion and cracks. Meanwhile, many oil and gas pipelines are buried either under the ground or at the bottom of the sea, which makes detection rather difficult. Consequently, the oil and gas industry is in great need of a set of machinery which can detect the pipelines harmlessly and automatically so as to make sure the security of them. This paper concerns the research and design on multicentre and automotive ultrasonic detection system.The development and the problems of nondestructive on-line detection for inner pipelines have been discussed in this paper. With investigation and research done, an overall system of simulated ultrasonic detection for inner pipelines has been worked out. There follows a thoroughly-designed subsystem of on-line data collection, leading to the successful programming of the communication software which can transfer the data of the position as well as the pipeline thickness exactly.However, some thorny problems, such as errors and its low ability of anti-jamming usually appear during the pipeline detection. So it is essential to diminish the errors and enhance its anti-jamming ability. An innovative method of measuring pipeline thickness based on power spectral evaluation computing has been put forward. Besides, experiments on the on-line measurement have yielded good results, proving the veracity and reliability of the measurement. Furthermore, the design and experimental results of the radical system of data collection for four channels and digital ultrasonic detection have been gained through this method. The techniques that the paper adopts are as follows: the analysis of power spectrum and the stimulated experiments by Matlab, dynamic real-time power spectrum evaluation computing and validation of experiments with VC++.In the end, the paper forecasts the trend in further research into digital ultrasonic signal processing , for example, how to use DSP to complete the data processing based on power spectral evaluation computing to reach a high speed, so that the problem of real-time during detection can be solved.