TY - JOUR A1 - Mielentz, Frank T1 - Phased Arrays for Ultrasonic Investigations in Concrete Components JF - Journal of nondestructive evaluation N2 - An innovative application of ultrasonic testing using phased arrays for concrete components was investigated. A low frequency ultrasonic phased array consisting of ten transducers was used. This configuration allowed the variation and control of the sound field directivity during the measurement. The measurements were carried out on concrete test specimens using a scanning laservibrometer in through transmission mode. The laboratory measurements were compared to theoretical calculations to investigate the influence of shape and dimension of the transducer on the resulting sound field patterns. The technique was successfully implemented to detect an ungrouted tendon duct in a concrete block. KW - Ultrasonic-echo KW - Concrete KW - Array technique KW - Phased array KW - Point source synthesis PY - 2008 DO - https://doi.org/10.1007/s10921-008-0032-6 SN - 0195-9298 SN - 1573-4862 VL - 27 IS - 1-3 SP - 23 EP - 33 PB - Plenum Press CY - New York, NY AN - OPUS4-17929 LA - eng AD - Bundesanstalt fuer Materialforschung und -pruefung (BAM), Berlin, Germany ER -