The water leakage correlation meter consists of a main unit and two symmetrical transmitting units (transmitters). The two transmitters detect the noise information of the water leakage sound source (water leakage droplets) propagating along both sides of the pipeline, and then transmit the data to the main unit through wireless or wired methods. The main unit performs calculations through autocorrelation mathematical and physical methods and finally provides the location of the water leakage droplets
Due to the viscosity of water and its initial velocity, it will rub against the pipe wall, causing vibration. This vibration spreads along the pipe in the form of waves to both sides. At the leakage points (such as gate Wells, etc.), the probe rod of an electronic leak detector can be used to pre-position the leakage points.
From the perspective of wave theory, its waves belong to linear waves, the sound source is the leakage point, and the sound energy - sound intensity decays exponentially and regularly. Due to the consumption of the medium, the wave energy will attenuate. The high-frequency part attenuates faster, while the low-frequency part attenuates more slowly. The closer to the leakage point, the higher the proportion of energy in the high-frequency part relatively. When listening attentively with the ear through the leakage detector, the sound will be perceived as sharp. The farther away from the water leakage point, the faster the high-frequency attenuation, so the human ear will feel that the sound has less power. The principle and method of valve bolt listening
When the water column escapes from the damaged area, due to its mass and initial velocity, it will strike the soil medium around the pipe body, causing vibration. This vibration spreads in the form of waves, with the equipotential surface radiating in a spherical direction in all directions. The waves belong to spherical waves, and their attenuation consists of two parts: spherical divergence for spatial propagation and heat consumption of the internal medium for radial propagation.
The closer the distance the water leakage noise travels, the greater the sound intensity at that location. When detecting the water leakage sound waves along the pipeline on the ground, the highest sound intensity is found around the projection point of the water leakage drop on the ground. By taking advantage of this feature, the water leakage detector can be controlled to precisely locate the leakage point by using the ground listening method.
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