This narrows the sensitivity of test volume and improves the signal-to-noise ratio of the received signals. In addition, the timed excitation of each transducer directs a focused beam of sound to a specific angle and distance based on the previously calculated delay time. To increase the sound pressure generated, the number of transducers in the novel probe is increased to 32 transducers. The probe is equipped with a commercially available portable ultrasonic flaw detector used in the NDT civil engineering industry. A prototype has been developed using 12 individual horizontal dry point contact (DPC) shear wave transducers separated by equidistant transmitter/receiver arrays. The aim is to examine the sealing structures made of salt concrete for any possible cracks and delamination and to localize built-in components. A novel ultrasonic borehole probe is developed for in situ quality assurance of sealing structures in radioactive waste repositories using existing research boreholes. Low-frequency ultrasonic testing is a well-established non-destructive testing (NDT) method in civil engineering for material characterization and the localization of cracks, reinforcing bars and delamination.
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