Current Developments in Digital Radiography and Computed Tomography from nm to macro scale

Ewert, Uwe; BAM Bundesanstalt fur Materialforschung und -prufung; Germany

Ewert, U.; Federal Institute for Materials Research and Testing (BAM); Germany

ID: ECNDT-0364-2018
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Date: 1970-01-01
Time: -

Digital Detector Arrays enable an extraordinary increase of contrast sensitivity in comparison to film radiography. Computed radiography with phosphor imaging plates substitutes film applications. The increased sensitivity of digital detectors enables the efficient usage for dimensional measurements and functionality tests substituting manual maintenance. The digital measurement of wall thickness and corrosion status is state of the art in petrochemical industry. X-ray back scatter techniques have been applied in safety and security relevant applications with single sided access of source and detector. First inspections of CFRP in aerospace industry were successfully conducted. Computed tomography (CT) applications cover the range from nm to m scale. Small structures of integrated circuits are visualized and measured with lens based CT-systems or at synchrotrons. Phase contrast imaging provides enhanced structure contrast in micro radiography and micro CT. The scope of typical CT applications changes from flaw detection to dimensional measurement in industry substituting coordinate measurement machines. Mobile computed tomography is applied for in-service radiographic crack detection and sizing of welded pipes in nuclear power plants and for NDT of large CFRP structures in aerospace applications. New specialized high energy CT devices have been laid out for inspection of complete cars before and after crash tests. High speed applications with flash tubes permit the 3D measurement of fast process dynamics including car crash visualization. Digital radiography techniques, computed tomography and computed laminography designs are nowadays developed by numerical simulation before hardware construction. New X-ray source concepts based on laser wake field acceleration permit further reduction of spot sizes and minifocus high energy applications.