Leak detection method for buried water supply and heating pipeline based on microwave detection technology

Abstract

The invention discloses a method for detecting leaks of embedded water supply and heating pipelines based on microwave detection technology. The method is based on the influence of the difference in dielectric properties of materials on the resonant frequency of microwave antennas for rapid detection of leaks. The invention relies on a set of hardware equipment to test. The hardware system is divided into three modules in total. Firstly, microwave signals with a frequency of 5 GHz are generated by microwave signal transceiver equipment, and the microwave signals are fed into a special flat-panel antenna 5 cm above the ground. The echo signal generated when the signal is reflected on the ground can form electromagnetic field resonance inside the antenna, and display the resonant peak value and resonant peak frequency on the signal transceiver equipment. The resonance perturbation method adopted in the present invention has higher precision, more sensitive sensing range and stronger anti-interference ability, and can test whether the pipeline at 50 cm underground is leaking without destroying the physical structure, which has great significance in the construction safety industry application value.

Description

technical field [0001] The invention belongs to the technical field of microwave testing, and in particular relates to a detection method for detecting whether a heating pipeline has problems such as leakage or leakage through microwave signals. Background technique [0002] The leakage of urban water and heating network is a common problem faced by many urban planning processes. According to the recent statistics released by China Water Supply Association, the leakage rate of domestic water supply pipe network is 27% on average, and the leakage rate of pipe network in small and medium-sized towns is as high as 35% to 42%. Taking the floor heating pipes for central heating in northern families as an example, polymer-based heating pipes are widely used in various heating pipes. Due to factors such as manufacturing process, wiring installation and aging failure, the possibility of leakage and leakage of heating pipes cannot be completely avoided under long-term high temperatu...

AI Technical Summary

Problems solved by technology

In actual use, these methods have many disadvantages. The poor penetration of ultrasonic waves on cement concrete leads to low detection accuracy; infrared thermal imaging often requires a significant temperature difference between the leaking water source and the ambient temperature; the listening method has requirements for operators It is very high, and it cannot work normally in a noisy environment; water pressure monitoring uses the water pressure difference at the main gate to estimate and predict, and can only monitor large-scale leakage events, and has little effect on the total pressure of micro-leakage and dripping. Larger cases tend to be less effective

At the same time, the above methods can only judge whether there is a water leak or not, and cannot accurately and quickly locate the leak point. The inherent defects of these methods are difficult to meet the practical needs of universality and rapidity for high-precision location of the water leak point.

[0004] In response to the detection requirements for precise location of water leakage in the pipeline network, some researchers have developed a miniaturized real-time pressure detector array based on a microcontroller. Real-time display of pipeline operation through wireless communication means. This kind of equipment has high precision and strong real-time performance, but it also brings problems such as high cost, difficult to guarantee the life of electronic devices, and difficult to design power supply system.

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