INDIGENOUS X-RAY INDUSTRIAL TOMOGRAPHY SYSTEM
Industrial objects vary widely in their shape, size and density. It is often
difficult to scan them on medical CT and Gamma ray CT systems due to the
limitations of energy selection, gantry size, geometrical unsharpness and larger
time of scanning. The imported technology available for scanning industrial
objects is exorbitantly costly. Also, the technology transfer of these scanners
was denied to India. DRDO has successfully developed an x-ray based Industrial
Computed Tomography (ICT) system for scanning large objects.
The system consists of 450 kV x-ray source, 256-channel scintillation detector
array (cadmium tungstate) and six-axes CNC mechanical manipulator. It can handle
objects of the size 1000 mm diameter (shell), 6 m height and 2000 kg weight. The
system has two scanning geometries—rotate only and translate-rotate—to
accommodate different sizes of objects. The scanning time of objects has been
considerably brought down due to 256-channel detector array and lesser
integration time. Typical scanning time for a 200 mm diameter object is 5 min in
rotate-only and 25 min for a 1000 mm dia shell in translate-rotate mode.
The spatial resolution of the system is one line pair/mm and the minimum slice
thickness is one mm. Region-of-interest and 3-D visualisation of the system
helps to see the extent of defect in 3-D. The critical and detailed information
provided by this system is difficult to obtain by any conventional
non-destructive testing method and is highly useful for various Integrated
Guided Missile Development Programme and other projects.
The system is first of its kind and class of systems available in India, is more
practicable, and a potential for non-destructive and reverse engineering