Optimized Designing Of Transducers In Nondestructive Inspection

Nondestructive Inspection is based on the premise of preserving the working condition of work-piece and material, which is a testing method to inspect the surface and inner qualities of the object to be tested. Because of its’ excellent sensitivity and bandwidth, ultrasonic transducer has been widely used in the field of nondestructive testing for the past few years. The demand of high performance transducers increases with the development of technology, which impels more and more scientists to study the optimization of transducers in order to get better performance.Many scholars have proposed a lot of theories about matching layer design, such as KLM model which view piezoelectric materials as part of matching layer, well reflecting the effect of matching to transducers. Based on the KLM model and the transfer matrix, the transducer can be equivalent to the form of transfer matrix and we can derive the pulse-echo curve equation. Comparing and analyzing the performance of transducers by changing material parameters, we can get designing parameters.Based on experimental methods, this paper discusses how the performance of transducers will change by changing the area of transducers, the variety of matching layer, the thickness of matching layer and adding a second matching layer, which lays the foundation for the optimization of transducers. The results show that in a certain extent, using appropriate matching material, appropriate area of transducers and adding a second matching layer are useful to improve the performance of transducers.