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: 7956711
• 负责人: CURT R DUNNAM
• 金额: $ 1.06万
• 依托单位: CORNELL UNIVERSITY
• 依托单位国家: 美国
• 财政年份: 2009
• 资助国家: 美国
• 起止时间: 2009-09-01 至 2010-08-31
• 项目状态: 已结题
• 来源: https://reporter.nih.gov/project-details/7956711
• 关键词: Computer Retrieval of Information on Scientific Projects Database; Development; Devices; Effectiveness; Funding; Grant; Image; Individual; Institution; Investigation; Maps; Microscopy; Phase; Process; Research; Research Personnel; Resolution; Resources; Source; System; Technology; Testing; Translations; United States National Institutes of Health; Work; 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. The subproject and investigator (PI) may have received primary funding from another NIH source, and thus could be represented in other CRISP entries. The institution listed is for the Center, which is not necessarily the institution for the investigator. 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.

该子项目是利用该技术的众多研究子项目之一 资源由 NIH/NCRR 资助的中心拨款提供。子项目和 研究者 (PI) 可能已从 NIH 的另一个来源获得主要资金， 因此可以在其他 CRISP 条目中表示。列出的机构是 对于中心来说，它不一定是研究者的机构。 尽管 ESR 微成像中采用的磁场梯度的有效性与所采用的成像序列密切相关，但实现尽可能强烈和几何强度的梯度仍然很重要。对于 16GHz 的显微成像工作，我们已经演示了峰值约为 26T/m 的相位梯度，对应于约 3 µm 的分辨率。在 35GHz 下，成像探头及其组成部件将变得更小，梯度线圈将获得超过 40T/m 的峰值，这是 1 µm 分辨率所需的。尽管梯度效率随着探头和线圈尺寸的减小而增加，但保持几何精度的问题将成比例地放大。同样明显的是，在 16GHz 和 35GHz 的梯度线圈开发主题中，梯度效率的进一步优化可能会实现更高的分辨率。我们的梯度线圈设计方法将结合模拟和实证测试。 出于这些原因，我们启动了一项计划，以实现为微成像探头设计的单个线圈和组装的梯度线圈组的高分辨率映射。我们目前的研究是超小型霍尔器件用于微米分辨率场测绘的可行性。我们已经获得了具有足够灵敏度的合适的 ~1mm 霍尔传感器，并且正在设计适合测试线圈现场测绘的转换平台。该测绘组件预计将以初始形式组装并在 2008 年秋季投入使用。