System and method for detecting corrosion of storage tank base plate based on ultrasonic Lamb wave

Abstract

A system and a method for detecting corrosion of a storage tank base plate based on an ultrasonic Lamb wave belong to the technical field of nondestructive detection for pressure containers. An upper computer (1) is connected with an arbitrary function generation board (2) connected with a power amplifier (3), the power amplifier (3) is connected with a multi-channel selector switch (4) connected with a signal separator, the signal separator (7) is connected with a detecting sensor array and a multi-channel data collection board (9) connected into the upper computer (1), and the multi-channel data collection board (9) transmits a collected signal to the upper computer. The system and method for detecting the corrosion of the storage tank base plate based on the ultrasonic Lamb wave do not need to empty the storage tank or perform liquid surface lifting and can perform on-line detection on an edge board. For the off-line detection of a center board, compared with other detection methods, the system and the method can finish detection of a whole steel plate through one-step excitation receiving so as to be fast and efficient.

Description

technical field [0001] The invention belongs to the technical field of non-destructive testing of pressure vessels, and in particular relates to a system and method for realizing corrosion detection of storage tank bottom plates by using ultrasonic Lamb wave non-destructive testing technology. Background technique [0002] Large oil storage tanks are widely used in industrial production and national strategic oil reserves. During long-term service, large storage tanks are prone to corrosion due to many factors, resulting in oil leakage and structural failure. Most of the materials stored in storage tanks are flammable, explosive or toxic oil products, which have a large capacity. Once they fail, they will often cause fire and explosion accidents, which will not only bring huge economic losses to the oil and gas industry, but also may cause heavy casualties. Accidents and serious environmental pollution. [0003] At present, the commonly used methods for regular detection o...

AI Technical Summary

Problems solved by technology

[0006] The purpose of the present invention is to overcome the shortcomings of low detection efficiency and insufficient detection practicability of the existing detection means, and use Lamb waves to detect the corrosion status of the bottom plate of the storage tank. Specifically, a low-frequency (80kHz~1MHz) zero-order symmetric The modal (S0 modal) Lamb wave realizes the detection and location of storage tank floor corrosion. An electromagnetic acoustic sensor that excites and receives the S0 modal Lamb wave in the circumferential direction is used for excitation and reception of signals, and the array full-focus algorithm is used to detect defects. Distributed imaging is realized, and the detection process is divided into two parts: the edge board online detection system and the medium width board offline detection system

Images