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- W4241107567 abstract "Air-coupled ultrasonic non-destructive testing (NDT) of elastic solids is a challenge due to the large impedance contrast between air and most materials used in industrial and structural applications. However, because air-coupled sensing offers many advantages such as rapid scanning of large areas and the elimination of part immersion for inspection, there remains strong incentive to find unique methods for air-coupled excitation of wave motion in elastic solids. This work presents experimental results of an in-air acoustic source that has been shown to excite wave motion in high impedance elastic solids. The source consists of a spark generator and an ellipsoidal reflector. The spark generator radiates a short-duration, high-amplitude acoustic signal as the result of an electrostatic discharge between two electrodes with high potential difference. Analogous to lithotripter, the spark is located at the near focus and generates an outgoing wave that is then focused at the far focus of the reflector which is co-located at the air-solid interface. Measurements of the air-borne acoustic wave in the free-field, the focused acoustic wave, and Rayleigh and zero-group-velocity (ZGV) Lamb waves generated in a concrete slab will be presented and analyzed. [Work supported by NIST Technology Innovation Program (TIP).]" @default.
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- W4241107567 date "2013-05-01" @default.
- W4241107567 modified "2023-09-30" @default.
- W4241107567 title "Excitation of Rayleigh and zero-group-velocity Lamb waves using air-borne N-waves focused by an ellipsoidal reflector" @default.
- W4241107567 doi "https://doi.org/10.1121/1.4806211" @default.
- W4241107567 hasPublicationYear "2013" @default.
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