Tags: Air-Coupled

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  1. Fully Non-Contact, Air-Coupled Generation and Detection of Ultrasound in Concrete for Nondestructive Testing

    13 Jan 2014 | Contributor(s):: Schempp, Fabian

    Advisors: Laurence J. Jacobs, Jin-Yeon Kim, Reginald DesRochesIt is well known that liquid coupling agents, which are commonly used in conventional ultrasonic testing to couple an ultrasonic transducer to a solid specimen, cause a number of problems including inconsistency in results and slowness...

  2. Air-Coupled Detection of Rayleigh Surface Waves to Assess Material Nonlinearity Due to Precipitation in Alloy Steel

    13 Jan 2014 | Contributor(s):: Thiele, Sebastian

    Advisors: Laurence J Jacobs, Jin-Yeon Kim, Jianmin QuNonlinear ultrasonic waves have demonstrated high sensitivities to various microstructural changes in metal including coherent precipitates; these precipitates introduce a strain field in the lattice structure. The thermal aging of certain...