Facilities

There are five x-ray inspection laboratories at the Center for NDE equipped with three microfocus tubes and three standard x-ray tubes.  A high resolution computed tomography facility with a microfocus x-ray tube (130 kV, 2-micron spot), 4-axis microstep positioner and an amorphous silicon array detector allows both high resolution (5 micron) digital radiography and 3D CT to be performed.  High-speed CT reconstruction is done on a 64-node Linux cluster, and custom image analysis software is available for visualizing 2D and 3D data sets.    Real-time radiography can be accomplished using three different image intensifier based systems: one is a cabinet system with a 160 kV, 0.2/2.0 mm spot tube, the other two tubes (200 kV, 5 micron microfocus, and 320 kV, 1.2/3.0 mm spot) are in a walk-in vault.  All three systems have multi-axis sample manipulation capabilities.  A standard x-ray tube (320kV, 1.5 /3 mm spot) with a multi-axis positioner coupled to a germanium/MCA photon counting detector allows for energy-sensitive materials characterization.  Several germanium, CdZnTe and NaI detectors enable spectral analysis of x-ray transmission and scattering.  A large (44×30 cm) phosphor screen/CCD camera imager can be positioned in one of the walk-in vaults for imaging and CT scans of larger objects.  A cooled 14-bit 512×512 CCD camera with a range of lenses is used for digitizing film.  X-ray detector testing and fabrication is carried out in a laboratory that includes an older 160 kV microfocus source.  The suite of x-ray inspection techniques is complimented by an x-ray simulation capability, which provides unique analysis tools for evaluating the effect of various parameters on image quality.  Through collaborations with the Department of Mechanical Engineering, we also have access to a real-time stereographic imaging system composed of two 200 kV x-ray tubes and two 16-inch diameter image intensifiers.