What is meant by oblique incident ray?
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perpendicular to that plane (along the y-direction) and transverse to the z-direction. In perpendicular polarization, also known as s-polarization,† σ-polarization, or TE. polarization, the electric fields are perpendicular to the plane of incidence (along the.May 7, 2011
Explanation:
Oblique incidence techniques
A common ultrasonic oblique incidence technique is shown in Fig. 7. Besides the benefit of a different look into the adhesive bond layer by way of refraction, there are other benefits of the oblique incidence technique. Worth noting, of course, is the fact that it can now have longitudinal and shear waves impinging onto the interface between the substrate and adhesive layer. This allows us to achieve excellent sensitivity for a variety of different problems that might be found in the adhesive bond layer. Motivation for some of the work associated with the oblique incidence technique was obtained by looking at normal beam shear wave techniques onto the adhesive layer. Quite often excellent sensitivity was obtained for weak interface situations. Because of the difficulty of the technique, though, in coupling the transducer to the test part, it was decided by many investigators to consider the refraction process of an oblique incidence where ultrasonic shear wave would directly impinge onto the interface in question. Some work reported by Pilarski and Rose [46] outlines the oblique incidence inspection technique that can lead to this special sensitivity for the weak interface situation. The weak interface in the paper was modeled as a spring having a variety of different boundary conditions at the interface going from a welded or perfect bond onto a smooth boundary condition associated with the kissing bond. Intermediate conditions were also studied. The theoretic work presented led to some very exciting experiments that are reported in Pilarski and Rose [46] and in more detail in Pilarski and Rose [47]. C-scan