Abstract
As one of the most important five means to transportation，pipeline transportation has become the artery of national economy modem enterprise．With the development of pipeline industry，pipelines aging，inevitable erosion，abrasion and human destroying，pipelines leakage occurs frequently，which not only affects the normal production，but also lead to serious pollution to the environment．Therefore，leak detection has become a significant part ofpipeline malfunctions detection．
The research status of pipeline leakage detection technology home and abroad is summarized in this thesis．Study on the leak detection and location technology．Design a acoustic leak detection system which leak hunting law as the main fact with the negative pressure，the balanced method of flow and shoulder the acoustic in order to complement．
This thesis described the causes of pipeline leaks，and the difference of variety detection methods． When the leak generated,there will be a spread of negative pressure wave along the pipeline．Thesis analyzes the negative pressure wave propagation laws，method of calculating wave velocity and temperature on the impact velocity．The design of the leak detection and location technology based on AT89S52 MCU was described.Principle,system construction,signal acquisition,signal processing and data processing aspects ale discussed and analyzed in this thesis．
According to pipeline leakage monitoring require．System hardware selection has been completed．Pipelines are exposed outdoors for years，the natural conditions is uncertainty．Terefore，to choose quality rdiable sensors is necessary．The sefisor selected in the thesis，are highly precision and mliable，which consistent with site requirements，able to guarantee the collection ofmonitoring signal quality．
Keywords ：transportation pipeline ;leakage detection ; negative pressure wave ; MCU ;Temperature measure ;LCD1602
