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With oil and gas pressure pipes long-term delivery of universal application, for pressure pipeline transport security and reliability requirements continue to increase. Pipeline leak detection as an important means of protecting the safety of pipeline, more and more people's attention. Traditional pipeline gas leak detection methods, investment, slow effect, the reasons for higher maintenance costs, and in our country can not be universal application. An urgent need to develop a state-of-the-art, practical, suitable for China's pipeline gas leak detection equipment to meet the needs of the different regions of enterprises gas leak detection. Subject objective is to develop a set of embedded systems based on ultrasonic pipeline gas leak detector, it is possible to complete the acquisition and processing of the ultrasonic waves generated by the scene due to the leakage of the high-pressure gas pipe, and the A / D conversion after the data for fast Fourier transform (FFT) transform, in the liquid crystal display its spectral characteristics. According to the general requirements of the system design, based embedded system design. Using C8051F120 microprocessor core embedded systems, it is fully integrated mixed-signal chip MCU. The chip can be a good analysis of the signal collected by the ultrasonic sensor and the FFT operation. The system uses a modular design, divided into signal acquisition, signal processing and LCD three modules. Hardware aspect, a brief introduction to the characteristics of the various components in the circuit, emphasis is given to the design process and the final realization of the circuit and the circuit works. Software, highlights the programming of the A / D conversion, FFT transform and Bresenham line drawing algorithm. Test results and the accuracy of analysis, simulation of high-pressure pipeline gas air compressor leak ultrasonic test equipment, the rationality of the design through the analysis of experimental data. Topics based on the analysis of the pipeline gas leak detection principle and traditional means of detection, by contrast the advantages and disadvantages of the various types of technology to finalize the design. The system design of high-performance single-chip the C8051F120 application, band-pass filter design and image processing technology, in-depth study. After the overall design, hardware selection, circuit design, Protel drawing, circuit board production, hardware, software programming and calibration testing, eventually developed a prototype. The ultrasonic waves generated with the prototype simulation pipeline gas leak is detected, and the experimental data with the measured value of specialized testing equipment synchronized compared. Research found that the prototype has the advantages of accurate measurement, high accuracy, good repeatability, and easy to use, intuitive and easy to carry, has some practical value.
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