磁场的三维极化中子层析成像
Three Dimensional Polarimetric Neutron Tomography of Magnetic Fields
摘要：
通过使用飞行时间三维极化中子层析成像（ToF 3DPNT），我们首次成功地展示了一种能够测量和重建三维磁场强度和方向的技术，该技术不引人注目，非破坏性地具有探测散装样品内部的潜力。使用用于ToF中子仪器的开创性极化设置与新开发的定制重建算法相结合，测量并重建了由载流螺线管产生的磁场，从而提供了一种技术的原理证明，该技术能够揭示迄今为止由于对许多材料的高度穿透而无法获得的关于大量材料和器件中的磁场的信息，包括金属，以及中子极化对磁场的敏感性。该技术充分利用脉冲中子源的ToF时间结构的潜力，以优化记录的信息质量并减少测量时间。
英文摘要：
Through the use of Time-of-Flight Three Dimensional Polarimetric Neutron Tomography (ToF 3DPNT) we have for the first time successfully demonstrated a technique capable of measuring and reconstructing three dimensional magnetic field strengths and directions unobtrusively and non-destructively with the potential to probe the interior of bulk samples which is not amenable otherwise. Using a pioneering polarimetric set-up for ToF neutron instrumentation in combination with a newly developed tailored reconstruction algorithm, the magnetic field generated by a current carrying solenoid has been measured and reconstructed, thereby providing the proof-of-principle of a technique able to reveal hitherto unobtainable information on the magnetic fields in the bulk of materials and devices, due to a high degree of penetration into many materials, including metals, and the sensitivity of neutron polarisation to magnetic fields. The technique puts the potential of the ToF time structure of pulsed neutron sources to full use in order to optimise the recorded information quality and reduce measurement time.
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