System and method for positioning damage of HDPE (High-Density Polyethylene) film of refuse landfill

Abstract

The invention discloses a system and a device for positioning damage of an HDPE (High-Density Polyethylene) film of a refuse landfill. The system and the device utilize the scattering characteristic of ultrasonic waves. By means of wave piezoelectric patches laid on the upper surface of a to-be-detected area of an HDPE film in a regular plane geometry mode, a wave piezoelectric patch generator controls half of the piezoelectric patches to generate ultrasonic waves in a self-excited oscillation mode, and preferably, in order to prevent mutual interference of detection systems, the piezoelectric patches on the designated opposite sides receive ultrasonic signals. Scanning is completed according to the process, an analog quantity damage signal is obtained, time-energy density characteristics are extracted through analog-to-digital conversion and wavelet analysis, damage positioning is achieved by combining probability imaging according to the energy density difference when damage exists or not, a damage alarm is given out through system control, and the damage position can be displayed. The system can solve the problems that an existing naked film detection method is low in timeliness, gas leaks, and the manual workload is large, active detection of the HDPE film is achieved through the vibration inducing piezoelectric plate, and the omission ratio is effectively reduced.

Description

technical field [0001] The invention relates to the field of environmental protection engineering, in particular to a HDPE film damage location system for landfills using ultrasonic scattering characteristics. Background technique [0002] In order to solve the problem of leachate leakage and pollution of groundwater in domestic waste landfills, HDPE membranes are usually used to prevent seepage. However, due to various reasons such as irregular construction and welding, the HDPE membrane will be damaged before the landfill is put into operation. Therefore, it is necessary to locate the damage in advance before putting it into use, so that it can be repaired in time. [0003] At present, the traditional HDPE bare film damage detection methods in landfills mainly include infrared detection method, vacuum box detection method, dipole method and so on. Among them, the infrared detection method needs to preheat the HDPE film, and locate the damaged area through the temperature ...

AI Technical Summary

Problems solved by technology

The system can solve the problems of low timeliness, gas leakage, and heavy manual workload of the existing bare film detection methods, and realizes the active detection of HDPE film through the vibration-induced piezoelectric film, effectively reducing the missed detection rate

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