Plane diffraction grating definition8/1/2023 Some advanced aircraft materials or coatings are porous or otherwise sensitive to the application of water, gel, or some other ultrasonic couplants. Rolling dry- coupled transducers for ultrasonic inspections of aging aircraft structures The influence of the surface condition on the module performance was evaluated for both types of the modules. Two different types of the ultrasonic modules with the flexible polymer substrates are being developed. Experiments have been carried out to analyze propagation of longitudinal and shear waves in the films. Ultrasonic properties of the polymer films were measured and compared with the properties of plastic or rubber-like materials commonly used for ultrasonic applications. The modules will be utilized to detect and characterize fatigue cracks and corrosion spots in the aircraft structures. Several polymer films have been evaluated to develop dry- coupled substrates for transducer modules. These materials are very flexible so even low pressure loading is sufficient to adapt the films to the irregular inspection surfaces. To overcome the problems associated with the liquid coupling medium, a number of polymer films have been developed to transmit the ultrasound through a dry interface. Polymer subtrates for dry- coupled ultrasonic transducersÄry- coupled inspection techniques are very important for applications on components with non-uniform surfaces and for inspections of advanced materials or coatings that are porous or otherwise sensitive to the application of water, gel, or some other ultrasonic couplants.
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