SUBMINIATURE MAGNETIC FIELD SURVEY PROBE SYSTEM FOR ESR MICROSCOPY

用于 ESR 显微镜的超小型磁场测量探针系统

• 批准号: 8364027
• 负责人: CURT R DUNNAM
• 金额: $ 0.05万
• 依托单位: CORNELL UNIVERSITY
• 依托单位国家: 美国
• 财政年份: 2011
• 资助国家: 美国
• 起止时间: 2011-09-01 至 2012-08-31
• 项目状态: 已结题
• 来源: https://reporter.nih.gov/project-details/8364027
• 关键词: Development; Devices; Effectiveness; Funding; Grant; Image; Individual; Investigation; Maps; Microscopy; National Center for Research Resources; Phase; Principal Investigator; Process; Research; Research Infrastructure; Resolution; Resources; Source; System; Technology; Testing; Translations; United States National Institutes of Health; Work; cost; design; falls; field survey; imaging probe; magnetic field; programs; sensor; simulation

This subproject is one of many research subprojects utilizing the resources provided by a Center grant funded by NIH/NCRR. Primary support for the subproject and the subproject's principal investigator may have been provided by other sources, including other NIH sources. The Total Cost listed for the subproject likely represents the estimated amount of Center infrastructure utilized by the subproject, not direct funding provided by the NCRR grant to the subproject or subproject staff. Although the effectiveness of the magnetic field gradients employed in ESR microimaging is closely related to the imaging sequence employed, it is nonetheless important to achieve as intense and geometrically intense gradients as possible. For microimaging work at 16GHz, we have already demonstrated phase gradients with peak values of ~26T/m, which corresponds to ~3 ¿m resolution. At 35GHz the imaging probe and its constituent components will be even smaller and the gradient coils will obtain peak values of more than 40T/m, required for 1 ¿m resolution. Although the gradient efficiency increases as the probe and coil size decreases, the problem of maintaining geometric accuracy will be proportionally magnified. It is also evident that, in the topic of gradient coils development at both 16GHz and 35GHz, further optimization of the gradient efficiency may enable even higher resolution. Our approach to gradient coil design will be a combination of simulation and empirical testing. For these reasons, we have initiated a program to enable high resolution mapping of individual coils and assembled gradient coil sets which have been designed for the microimaging probes. Our current investigation is the viability of subminiature Hall devices for micron-resolution field mapping. We have obtained suitable ~1mm Hall sensors of adequate sensitivity and are in the process of designing a translation platform suitable for field mapping of the test coils. This mapping assembly is expected to be assembled in an initial form and usable during fall 2008.

该副本是利用资源的众多研究子项目之一 由NIH/NCRR资助的中心赠款提供。对该子弹的主要支持 而且，副投影的主要研究员可能是其他来源提供的 包括其他NIH来源。列出的总费用可能 代表subproject使用的中心基础架构的估计量， NCRR赠款不直接向子弹或副本人员提供的直接资金。 尽管在ESR微成像中携带的磁场梯度的有效性与执行的成像序列密切相关，但是至关重要的是要尽可能地实现强烈和几何强度的梯度。对于16GHz的微型成像工作，我们已经证明了峰值为〜26T/m的相位梯度，这对应于〜3`m分辨率。在35GHz时，成像探针及其构成的组件将更小，梯度线圈将获得1»m分辨率所需的峰值大于40t/m以上。尽管梯度效率随探针和线圈大小的减小而提高，但保持几何精度的问题将被按比例放大。还可以证明，在16GHz和35GHz的梯度线圈开发方面，进一步优化了梯度效率，可以实现更高的分辨率。我们对梯度线圈设计的方法将是模拟和经验测试的结合。 由于这些原因，我们已经启动了一个程序，以实现为微成像问题设计的单个线圈和组装梯度线圈集的高分辨率映射。我们目前的投资是用于微分辨率现场映射的Subminatiature Hall设备的生存能力。我们已经获得了适当的〜1mm霍尔传感器，具有足够的灵敏度，并且正在设计适合测试线圈现场映射的翻译平台。预计该映射组件将以初始形式组装，并在2008年秋季使用。