Thickness Measuring of Thin Metal by Non Destructive with Fuzzy Logic Control System

Non-Destructive Testing & Evaluation methods are developed to inspect and investigate materials and structures. Ultrasonic Testing is an NDT method can be used for measuring the thickness of objects, as one of its significant applications. The objective of this paper is designing and applying an intelligent UT fuzzy control system for evaluating the thickness of thin metal objects in a range of 5-20 mm. The designed Fuzzy Logic Controller has five variables including four inputs and one output. The inputs are frequency of probe, couplant's acoustic impedance, object’s acoustic impedance, and temperature; also the output is thickness, particularly of thin objects. This suggested method has been applied to four metals. Our strategy consists of three steps; and it has been preferred to utilize pulse-echo method because of using the immersion method. The experimental results imply that the proposed procedure has been able to control and measure the thickness of thin objects (5-20 mm) successfully within a rate of mean error of 0.5%.