Abstract
In this study, the frequency and shape characteristics of the sounds of leaks in water pipes were analyzed using an LTE-M1 sensor. We verified the relevance through frequency analysis and cross correlation analysis of the leakage signals for metal(STS) pipes and PE pipes. By processing the leakage signal detected by the sensor to determine the frequency bandwidth from 0 ~ 5120 Hz, it was found that the leak signal is strongest in the range of 200 ~ 400 Hz. Therefore, the specific frequency range of the leak sound was confirmed from 200 to 400 Hz. The intensity was attenuated with increasing distance from the leakage point. When comparing to the metal pipe and the PE pipe, the range of the frequency did not differ much, but the intensity of the frequency signal in the metal pipe was relatively high. The leak-detecting frequency band in which the leak occurs in pipes indicated that the strength of the leak signal weakens as it moves away from the leak point. These studies can be used as basic data to analyze the frequency characteristics of leaks and apply them to future technologies such as artificial intelligence, big data, IoT, and 5G to find leak points.
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