Title :
A high resolution neutron counting sensors in strain mapping through a transmission bragg edge diffraction
Author :
Tremsin, A.S. ; McPhate, J.B. ; Vallerga, J.V. ; Siegmund, O.H.W. ; Kockelmann, W. ; Steuwer, A. ; Feller, W.B.
Author_Institution :
Space Sci. Lab., Univ. of California at Berkeley, Berkeley, CA, USA
Abstract :
High resolution neutron counting sensors with microchannel 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 MCP 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 non-destructive studies in such diverse areas as neutron microtomography, dynamics of fuel injection, material composition, archaeology, water propagation and many others.
Keywords :
microchannel plates; neutron detection; neutron diffraction; strain sensors; ISIS spallation neutron source; ROTAX beamline; archaeology; bent steel sample; cold neutron; distance -100 mum; fuel injection dynamic; high resolution neutron counting sensor; high resolution strain mapping; material composition; microchannel plate detector; neutron microtomography; size -55 mum; spatial resolution; temporal resolution; thermal neutron; time 1 mus; timepix readout; transmission Bragg edge diffraction; water propagation;
Conference_Titel :
Sensors, 2010 IEEE
Conference_Location :
Kona, HI
Print_ISBN :
978-1-4244-8170-5
Electronic_ISBN :
1930-0395
DOI :
10.1109/ICSENS.2010.5690931
