Technische Universität München Forschungs-Neutronenquelle Garching, ZWE FRM-II Energy selective time of flight Neutron Radiography Johannes Brunner, Burkhard.

Präsentation zum Thema: "Technische Universität München Forschungs-Neutronenquelle Garching, ZWE FRM-II Energy selective time of flight Neutron Radiography Johannes Brunner, Burkhard."—  Präsentation transkript:

1 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

2 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.

3 Technische Universität München Forschungs-Neutronenquelle Garching, ZWE FRM-II NR images of a Gadolinium-foil with a star pattern at different energies Δx=0.2 - 0.5 mm, Δt=0.1 ms (20000 acc),  = 10-30%, FOV: 161 x 166 mm² (1300 x 1340 pixel)

4 Technische Universität München Forschungs-Neutronenquelle Garching, ZWE FRM-II Δt= 100µs (40.000 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

5 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

6 Technische Universität München Forschungs-Neutronenquelle Garching, ZWE FRM-II fusion

7 Technische Universität München Forschungs-Neutronenquelle Garching, ZWE FRM-II Movie of difference images fused with NR images

8 Technische Universität München Forschungs-Neutronenquelle Garching, ZWE FRM-II iron

9 Technische Universität München Forschungs-Neutronenquelle Garching, ZWE FRM-II copper brass