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This paper presents an adaptive leak detection and location scheme for gas pipelines by using acoustic emission (AE) sensors. When gas being ejected from pipelines, an acoustic emission is produced at the leak hole and the acoustic vibration is transmitted along the pipeline. The acoustic movement can be picked up by AE sensors placed at either sides of a suspected leak on the outer surface of pipelines...
In the correlation-based leak location, it is supposed that the correlative components in the spatially separately collected acoustic signals merely result from a leak or leaks. This is why a false leak location will be produced when there is a non-leak acoustic source occurring outside a pipeline. To void a false leak location, it is necessary to detect whether or not a real leak exists in the pipeline...
An intelligent water pipe leak detection and location instrument is developed based on adaptive filtering methods. To achieve its better performance in lower SNR and nonstationary environments, the paper studies two information processing schemes: bias-free LMS time delay estimation(LMSTDE) and real-time evaluation of the adaptive estimation result by dynamically discriminating the adaptation's convergence...
The leak acoustic signals collected on pipelines play an important role in detecting a leak or leaks in buried pipelines. The traditional detection methods have shown some promise in detecting leak in the absence of a fixed non-leak acoustic source occurring in or outside the detected pipeline. However, in practice, the leak signals are inevitably corrupted with these non-leak sounds as usual. In...
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