Metrology for ultra-low magnetic fields

超低磁场计量

• 批准号: 324668647
• 负责人: Dr. Rainer Körber, Ph.D.
• 金额: --
• 依托单位: Abteilung 8 - Medizinphysik und metrologische Informationstechnik
• 依托单位国家: 德国
• 项目类别: Core Facilities
• 财政年份: 2017
• 资助国家: 德国
• 起止时间: 2016-12-31 至 2019-12-31
• 项目状态: 已结题
• 来源: https://gepris.dfg.de/gepris/projekt/324668647?language=en
• 关键词: Metrology; ultra; low; magnetic; fields

PTB has a long standing history in the measurement of ultra-low magnetic fields. PTB operates several magnetically shielded rooms and since 2004 the walk-in magnetically shielded room BMSR-2 with worldwide unmatched shielding features. The magnetic sensors that are operated in these rooms are home-built SQUID magnetometers with sensitivity down to the sub-femtotesla range. In addition to their expertise in magnetic metrology, the competence of the PTB staff includes manufacturing of non-magnetic setups and material characterization - an essential requirement for the practical work in ultra-low magnetism. The measurement technique of ultra-low magnetic fields is a well established tool for biosignal registration, in particular for studying brain activity by means of magnetoencephalography (MEG). In addition to this traditional application, metrology for ultra-low magnetic fields has gained increasing importance in a number of other, very different scientific fields. One of them is the characterization, quantification, and visualization of magnetic nanoparticles (MNP): indispensable information when MNP are used as a diagnostic tool in magnetic resonance and magnetic particle imaging, or as a therapeutic tool for focused cancer therapy. Yet another application has emerged by nuclear magnetic resonance in ultra-low fields. In such low fields, precession frequencies of a few Hertz open the window for the investigation of slow molecular dynamics, a domain that up to now was difficult to access for molecular physicists. Even more exciting, the precession of polarized noble gases in ultra-low fields having spin coherence times of more than 100h may serve as a probe for testing fundamental symmetries in nature. In the past, these applications were explored at PTB in collaboration with various external partners. Now the increasing number of external requests for access to our facilities of partners imposes a workload that is difficult to cope with in addition to the metrological mission of PTB. In particular there is the need for a management framework. This includes a regulation concept for managing the access to the core facility, for hands-on technical and scientific support of external scientists, as well as for the dissemination of knowledge. The advancement of magnetic measurement technique and infrastructure is an integral part of this proposal.

PTB在测量超低磁场方面有着悠久的历史。PTB经营几个磁屏蔽室，自2004年以来，步入式磁屏蔽室BMSR-2具有全球无与伦比的屏蔽功能。在这些房间中操作的磁传感器是自制的SQUID磁力计，灵敏度低至亚毫微微特斯拉范围。除了他们在磁性计量方面的专业知识外，PTB员工的能力还包括非磁性装置的制造和材料表征-这是超低磁性实际工作的基本要求。超低磁场的测量技术是用于生物信号配准的成熟工具，特别是用于借助于脑磁图（MEG）来研究大脑活动。除了这一传统应用外，超低磁场计量在许多其他非常不同的科学领域中也越来越重要。其中之一是磁性纳米粒子（MNP）的表征，定量和可视化：当MNP用作磁共振和磁性粒子成像中的诊断工具或作为聚焦癌症治疗的治疗工具时，不可或缺的信息。另一个应用是核磁共振在超低磁场中的应用。在如此低的磁场中，几赫兹的旋进频率为研究慢分子动力学打开了一扇窗，这是一个迄今为止分子物理学家难以进入的领域。更令人兴奋的是，极化惰性气体在自旋相干时间超过100小时的超低场中的进动可以作为测试自然界基本对称性的探针。过去，PTB与各种外部合作伙伴合作探索了这些应用。现在，越来越多的外部请求进入我们的设施的合作伙伴强加了一个工作量，很难科普除了PTB的使命。特别是需要一个管理框架。这包括一个管理核心设施使用情况的监管概念，以便为外部科学家提供实际技术和科学支持，以及传播知识。磁测量技术和基础设施的进步是这一建议的一个组成部分。