Laser ultrasonic corrosion detection of oil tank in petroleum reserve base
To solve the problem of oil leakage caused by corrosion in oil storage tanks,a non-destructive testing method for corrosion of oil storage tanks in oil reserve bases based on laser ultrasound technology was proposed.The thermal elastic effect and thermal corrosion effect generated by laser ultrasonic scanning of oil storage tanks generated Lamb waves,based on the changes in symmetric and antisymmetric modes when Lamb waves propagated in oil storage tanks.According to the structure of the oil tank,sensors were arranged to scan the storage tank with a laser,collected ultrasonic signals using the sensors,and set the Lamb wave signal on the normal tank wall as the standard signal.The corrosion scattering signals were extracted based on the time-domain characteristics of the signal.The presence of corrosion damage in the oil storage tank was determined and a corrosion damage factor was introduced to estimate the corrosion depth of the tank body.The experimental results showed that when using laser to scan the corroded oil storage tank model,the signal intensity was higher in non corroded positions,and the signal intensity was weaker as the scanning position is closer to the corrosion center;This method can determine the corrosion depth of the tank body by the numerical value of the corrosion damage factor,and provide reference opinions for the replacement time of the tank body.
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