thickness measuring of thin metal by non destructive with fuzzy logic control system

non-destructive testing & evaluation methods are developed to inspect and investigate materialsand structures. ultrasonic testing is an ndt method can be used for measuring the thickness ofobjects, as one of its significant applications. the objective of this paper is designing and applyingan intelligent ut fuzzy control system for evaluating the thickness of thin metal objects in a rangeof 5-20 mm. the designed fuzzy logic controller has five variables including four inputs and oneoutput. the inputs are frequency of probe, couplant's acoustic impedance, object’s acousticimpedance, and temperature; also the output is thickness, particularly of thin objects. this suggestedmethod has been applied to four metals. our strategy consists of three steps; and it has beenpreferred to utilize pulse-echo method because of using the immersion method. the experimentalresults imply that the proposed procedure has been able to control and measure the thickness of thinobjects (5-20 mm) successfully within a rate of mean error of 0.5%.