Abstract: In one general aspect, an apparatus includes a probe including an exterior probe element including a first plurality of links defining a first flexible element. The exterior probe element defines a guard ring. The probe also includes an interior probe element including a second plurality of links defining a second flexible element and disposed within at least a portion of a perimeter defined by the exterior probe element. The apparatus includes a waveform generator electrically coupled to the exterior probe element and the interior probe element.

Abstract: A non-destructive test system includes a plurality of impact devices including a knob configured to generate at least one flexural mode in a material when a surface of the material is impacted by the knob, a controller configured to independently control each of the plurality of impact devices, the controller having a communications channel for each of the plurality of impact devices, and a microphone configured to detect an acoustic response generated upon impact of the knob on the surface of the material, the acoustic response being based on the at least one flexural modes generated in the material.

Abstract: In one general aspect, an apparatus can include a probe including an exterior probe element including a first plurality of links defining a first flexible element. The exterior probe element can define a guard ring. The probe can also include an interior probe element including a second plurality of links defining a second flexible element and disposed within at least a portion of a perimeter defined by the exterior probe element. The apparatus can also include a waveform generator electrically coupled to the exterior probe element and the interior probe element.

Abstract: The method includes dispensing an object at a portion of concrete, determining an impact time of the object on the portion of concrete, detecting at least one acoustic wave reflected from the portion of concrete, filtering the at least one acoustic wave, and identifying a defect in the portion of concrete based on the filtering.

Abstract: A non-destructive test system includes a plurality of impact devices including a knob configured to generate at least one flexural mode in a material when a surface of the material is impacted by the knob, a controller configured to independently control each of the plurality of impact devices, the controller having a communications channel for each of the plurality of impact devices, and a microphone configured to detect an acoustic response generated upon impact of the knob on the surface of the material, the acoustic response being based on the at least one flexural modes generated in the material.

Abstract: An apparatus can include a trough configured to be removably attached to a discharge chute and receive a slurry discharged therefrom. The apparatus can include a basin connected to a lower end of the trough, and can include a plurality of drainage nozzles disposed along a bottom of the basin and configured to concurrently distribute the slurry to a plurality of locations where the plurality of drainage nozzles includes an adjustable drainage nozzle.

Abstract: An apparatus can include a trough configured to be removably attached to a discharge chute and receive a slurry discharged therefrom. The apparatus can include a basin connected to a lower end of the trough, and can include a plurality of drainage nozzles disposed along a bottom of the basin and configured to concurrently distribute the slurry to a plurality of locations where the plurality of drainage nozzles includes an adjustable drainage nozzle.

Abstract: The method includes dispensing an object at a portion of concrete, determining an impact time of the object on the portion of concrete, detecting at least one acoustic wave reflected from the portion of concrete, filtering the at least one acoustic wave, and identifying a defect in the portion of concrete based on the filtering.