Three-dimensional stress-strain imaging by a new-type pulsed neutron tomography

2014 Fiscal Year Final Research Report

• Project/Area Number: 24710099
• Research Category: Grant-in-Aid for Young Scientists (B)
• Allocation Type: Multi-year Fund
• Research Field: Quantum beam science
• Research Institution: Hokkaido University
• Principal Investigator: SATO Hirotaka 北海道大学, 工学(系)研究科(研究院), 助教 (30610779)
• Project Period (FY): 2012-04-01 – 2015-03-31
• Keywords: 中性子 / イメージング / ブラッグエッジ / ひずみ / テンソルCT

Outline of Final Research Achievements

It is expected that three-dimensional imaging of strain information obtained by the neutron Bragg-edge imaging is achieved by the computed tomography (CT) technique. However, since the strain is the tensor physical quantity which is changed by the observing direction, strain tomography is impossible for traditional CT techniques. Therefore, a new CT image reconstruction technique, the tensor CT algorithm, was developed. As a result, it was found that the tensor CT is possible by individual reconstruction of each scalar component included in the observed tensor quantity. Furthermore, it was also found that an algorithm of back-projection of angle-dependent weight in ML-EM is important, and finally strain tomography was successfully carried out.

Free Research Field

中性子応用工学