Detection and location method for leaked sound signals

Abstract

The invention provides a detection and location method for leaked sound signals. The method comprises the steps of 1, acquiring leaked sound signals, ambient noise signals and other interference noise signals in the vicinity of a leakage point; 2, extracting the features of leaked signals; 3, calculating the approximate entropy on a selected autocorrelation function value to obtain the metric of the signal complexity; 4, conducting the system identification for leaked signals: acquiring the approximate entropy of the autocorrelation function of leaked signals, adopting the approximate entropy as the input of the neural network algorithm, and identifying the occurrence of a real leakage accident; 5, identifying a blind system and locating the leakage point. According to the technical scheme of the invention, a sensor is adopted to replace the manual operation. Therefore, leakage points can be automatically detected and accurately located. The primary problem that the locating is difficult can be solved. Based on the blind system identification principle, leakage points can be located. In this way, the method is not limited by the actual conditions of detection objects. The detection and the location in both positive pressure and negative pressure are realized. Moreover, the method is not limited by detection environments, and the detection operation can be conducted at any time.

Description

technical field [0001] The invention belongs to the technical field of signal detection, and in particular relates to a method for detecting and locating leaked acoustic signals. Background technique [0002] For the leak detection of the sealed structure, there are many ways to realize it, but most of them are not suitable for large-scale projects. Especially in large-scale high-power solid-state laser devices, due to the requirements for beam quality, the beam is transmitted in a fully enclosed vacuum tube and an optical transmission tube filled with special gas, and finally converges to the center of the circular vacuum target chamber. Therefore, large-scale laser projects have strict requirements on the sealing state of the light transmission pipeline and the target chamber, such as the requirement for a vacuum degree of 10 -4 Pa ultimate vacuum. In the process of laser construction and operation, due to the complexity and height of various structural parts such as pip...

AI Technical Summary

Problems solved by technology

Therefore, the detection accuracy of most detection methods cannot meet the detection requirements. At present, the only detection accuracy that meets the requirements is helium mass spectrometry.

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