Technische Universität München Forschungs-Neutronenquelle Garching, ZWE FRM-II Energy selective time of flight Neutron Radiography Johannes Brunner, Burkhard Schillinger, Gabriel Frei, Eberhard Lehmann Technische Universität München, Physik E21 ISIS, Neutron Spallation Source, Oxford, UK Paul Scherrer Institut, Villigen, Switzerland
Technische Universität München Forschungs-Neutronenquelle Garching, ZWE FRM-II J.R. Santistaban, L. Edwards, M.E. Fitzpatrick, A. Stewer, P.J. Withers, M.-R. Daymond, M.W. Johnson, N. Rhodes, E.M.Schooneveld, Strain imaging by Bragg edge neutron transmission, Nucl. Instruments and Methods in Physics research Section A 0 (2001) 1-4 The neutron attenuation coefficient is energy dependent. N. Kardjilov, B. Schillinger, E. Steichele, Energy-selectiv neutron radiography and tomography at FRM, submitted to J. Apl. Rad. Isotopes (2001) This allows better contrasts in the NR image material discrimination.
Technische Universität München Forschungs-Neutronenquelle Garching, ZWE FRM-II NR images of a Gadolinium-foil with a star pattern at different energies Δx= mm, Δt=0.1 ms (20000 acc), = 10-30%, FOV: 161 x 166 mm² (1300 x 1340 pixel)
Technische Universität München Forschungs-Neutronenquelle Garching, ZWE FRM-II Δt= 100µs ( acc) t=16 – 19.7 ms = 10-30% FOV: 100 x 100 mm² electric motors Material stack: PVC Teflon Titanium Aluminium Iron Copper Brass Steel
Technische Universität München Forschungs-Neutronenquelle Garching, ZWE FRM-II Difference images between two different energies, below and above the iron Bragg cutoff - = = Difference image in false colors
Technische Universität München Forschungs-Neutronenquelle Garching, ZWE FRM-II fusion
Technische Universität München Forschungs-Neutronenquelle Garching, ZWE FRM-II Movie of difference images fused with NR images
Technische Universität München Forschungs-Neutronenquelle Garching, ZWE FRM-II iron
Technische Universität München Forschungs-Neutronenquelle Garching, ZWE FRM-II copper brass