Full-area detection method for storage tank floor based on active and passive acoustic fusion

Abstract

The invention discloses an active-passive sound fusion full-area detection method for the bottom plate of a storage tank. In the full-area detection method for the bottom plate of a storage tank, an intrinsically safe waterproof sensor or a sensor array formed by a plurality of intrinsically safe waterproof sensors is put into the storage tank. The central area of ​​the bottom plate inside monitors the tank together with the acoustic wave sensors evenly arranged on the edge plate of the tank bottom. At the same time, the active acoustic excitation modulation signal and passive acoustic emission signal are collected, which can complete the fusion analysis and processing of frequency domain and time domain information to form a storage tank. The image of the distribution, size and corrosion activity of tank bottom defects is especially suitable for the detection of large storage tanks. The invention changes the sensor point-by-point detection mode of the traditional ultrasonic guided wave technology, adopts the active acoustic excitation detection method of the acoustic signal excitation mode and the defect modulation signal extraction method, and improves the detection coverage; and integrates the passive acoustic emission detection method on the bottom plate of the storage tank. The detection will greatly improve the detection efficiency, and the evaluation results will be more comprehensive, intuitive and reliable.

Description

technical field [0001] The invention belongs to the technical field of storage tank detection, and relates to a full-area detection method for a storage tank bottom plate by active and passive acoustic fusion. Background technique [0002] Ultrasonic guided wave and acoustic emission are technologies that can realize on-line inspection of storage tank bottom plate without opening the tank and not stopping production. in: [0003] Ultrasonic guided wave is an active acoustic technology. The test system shows that the sensor is placed on the edge plate of the polished tank bottom. Under the control of the guided wave transceiver, the sensor actively sends a pulse signal to the tank bottom to excite Lamb waves. When the Lamb wave When a defect is encountered, an echo is formed, and the position of the defect can be calculated more accurately by analyzing the echo signal. In this way, the sensor is run along the edge plate of the tank bottom for a circle to perform point-by-po...

AI Technical Summary

Problems solved by technology

[0006] Since the ultrasonic guided wave system in the prior art can only determine the location of the corrosion defect of the tank bottom, and the specific size cannot be obtained yet, while the acoustic emission system can only detect the corrosion activity of the tank bottom. Incomplete evaluation results may occur during online testing

[0007] In addition, because the ultrasonic guided wave technology needs to run the sensor along the edge plate of the tank bottom for a point-by-point detection, the ultrasonic guided wave technology has defects such as low monitoring efficiency and small coverage of sound wave attenuation detection.

Images