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High-Resolution Neutron Counting Sensor in Strain Mapping Through Transmission Bragg Edge Diffraction

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7 Author(s)
A. S. Tremsin ; Space Sciences Laboratory, University of California at Berkeley, Berkeley, CA, USA ; J. B. McPhate ; J. V. Vallerga ; O. H. W. Siegmund
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High-resolution neutron counting sensors with mi crochannel plates coupled to a Timepix readout enable high spatial (~55 μm) and temporal (~1 μs) accuracy for each detected thermal and cold neutron. One of the attractive applications for those sensors is the high-resolution strain mapping in engineering samples through transmission Bragg edge diffraction. The unique combination of high detection efficiency (up to 70%), high spatial and temporal resolution of, detectors enable ~100 μm strain mapping with ~100 μstrain accuracy. We present the results of proof of principle measurements performed at ROTAX beamline at ISIS spallation neutron source. Strain map of a bent steel sample is measured with very high spatial resolution. The same sensors enable high-resolution nondestructive studies in such diverse areas as neutron microtomography, dynamics of fuel injection, material composition, archaeology, water propagation and many others.

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IEEE Sensors Journal  (Volume:11 ,  Issue: 12 )