Water Line Leak Detection Using Multi-Band Noise Thresholds
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Solution Overview
Problem
Existing methods struggle to effectively distinguish interference noises from leakage noises in fluid media lines, particularly in water lines, leading to inaccurate leak detection due to mixed audio signals.
Innovation Solution
A method utilizing a noise and/or frequency logger with a sensor and computing unit that performs frequency analysis, divides the noise spectrum into frequency bands, sets individual threshold values for each band, and generates warning signals based on threshold exceedance to differentiate between leakage and interference noises.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If noise level and single frequency value are used for leak detection, then the detection process is simple, but the ability to distinguish leakage noise from interference noise deteriorates
Solution Approach 1:
The frequency spectrum is divided into multiple frequency bands (e.g., 0-20 Hz, 20-40 Hz, 40-60 Hz, etc.), and threshold values are independently determined for each band. This segmentation allows the system to distinguish leakage noise characteristics from interference noise characteristics across different frequency ranges, resolving the contradiction between simple detection and accurate differentiation.
2Measurement precision
If multiple frequency bands with individual thresholds are used, then the differentiation between leakage and interference noise is improved, but the device complexity and data processing requirements increase
Solution Approach 1:
Threshold values for each frequency band are pre-determined based on measurements from leak-free lines during installation or commissioning. These pre-stored thresholds are then used during operational leak detection, eliminating the need for real-time complex threshold calculations and reducing processing complexity while maintaining high differentiation accuracy.
3Measurement precision
If the sensor is positioned close to the leak, then the high frequency components of leakage noise are enhanced, but the susceptibility to interference noise increases
Solution Approach 1:
The frequency spectrum is segmented into multiple bands, allowing the system to identify and emphasize high-frequency components (150-600 Hz) that are characteristic of leakage noise while simultaneously recognizing and filtering out interference noise patterns in other frequency ranges, thus maintaining sensitivity while reducing harmful interference effects.
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
Enhances the ability to differentiate between leakage and interference noises, improving the accuracy of leak detection by evaluating frequency components and reducing data volume through band division and threshold settings.
Implementation Method 1
measuring noise in the line via the sensor... for measuring a noise by means of the vibration and/or the structure-borne sound in the line wall
Implementation Method 2
detect leakage noises by determining the noises generated by leakages
Implementation Method 3
a frequency analysis, in particular a Fourier analysis, preferably a fast Fourier transform, of the noise level for determining a frequency spectrum
Implementation Method 4
The sensor preferably is or comprises a noise sensor and/or a piezo sensor and/or a piezo microphone
Implementation Method 5
a hydrophone for directly measuring the noise in the water column
Data Source
AI summary
A method for determining a leak in a line for fluid media can include providing at least one noise and/or frequency logger comprising a sensor, and a computing unit, attaching the noise and/or frequency logger to the line or to fittings thereof, measuring noise on the line via the sensor and determining a noise level by means of a frequency analysis of the noise level. The determined frequency spectrum may be divided into two or more frequency bands, and a threshold value may be determined for each frequency band. A threshold value can be determined for each frequency band, and compare the measured noise to determine if one or more threshold values are being exceeded. A leak in the line can thus be determined and/or analyzed by means of the computing unit.