The ultrasonic shear wave tomography test instrument, commercially known as MIRA, is a flaw detection system capable of generating 2D or 3D tomographic images of concrete, stone, masonry and other materials. The basic system consists of a phased array antenna with 12 modules; each module contains 4 dry point contact (DPC) shear wave transducers. A modified, synthetic aperture focusing technique (SAFT-C) data processing algorithm is performed to generate the 2D and 3D images of the reflected waves. The MIRA system is commonly used to measure the thickness of the test elements to about 2m thick, and to assess the condition of the materials to determine the presence of delaminations, internal voids, cracks, poor consolidation or honeycomb, etc.
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