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The novel ultrasonic NDT technique based on application of long range guided waves is proposed for detection of defects in a storage tank floor. The technique needs access only to the outer edge of the tank floor and do not require emptying and cleaning inside of the tank. The technique has been developed on the basis of the Lamb wave transmission tomography. The propagation of the guided waves in the tank floor has been carried out using simulation and experimental verification. The resultsdoi:10.1504/ijmpt.2011.040291 fatcat:x635vjbtdbghdehirswcpoen7a