ESR MICROSCOPE HAVERSINE GRADIENT COIL DRIVER UPGRADE

ESR 显微镜哈弗辛梯度线圈驱动器升级

• 批准号: 8364023
• 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/8364023
• 关键词: Electronics; Engineering; Feedback; Funding; Future; Goals; Grant; Hybrids; Interruption; Microscope; National Center for Research Resources; Output; Physiologic pulse; Principal Investigator; Research; Research Infrastructure; Resources; Source; System; Technology; United States National Institutes of Health; cost; design and construction; experience; improved; instrument; next generation; reconstruction

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. A significant goal of our upgrade effort for the 16GHz pulse ESR microscope has been improving the reliability of electronic sub-systems which comprise this instrument. To avoid significant additional future downtime caused by spotty reliability of the existing haversine gradient coil driver, this subsystem has been disassembled and critical sections have been redesigned and rebuilt. Since the rebuild, we have not experienced any further operational interruptions due to this unit. Upgraded sections include the isolation power converters, the MOSFET drivers, reconstruction of the output network and feedback network revisions to the narrow-band z-axis constant-current driver for stability enhancement. Engineering refinements developed in the course of making these upgrades are presently being applied to design and construction of next-generation hybrid gradient driver systems of higher peak power capability.

这个子项目是利用资源的许多研究子项目之一。 由NIH/NCRR资助的中心拨款提供。对子项目的主要支持 子项目的首席调查员可能是由其他来源提供的， 包括美国国立卫生研究院的其他来源。为子项目列出的总成本可能 表示该子项目使用的中心基础设施的估计数量， 不是由NCRR赠款提供给次级项目或次级项目工作人员的直接资金。 我们升级16 GHz脉冲ESR显微镜的一个重要目标是提高组成该仪器的电子子系统的可靠性。为了避免因现有半正弦梯度线圈驱动器的可靠性参差不齐而导致未来显著的额外停机时间，该子系统已被拆卸，并重新设计和重建了关键部分。自重建以来，我们没有经历过由于这个单元而造成的任何进一步的操作中断。升级部分包括隔离功率转换器、MOSFET驱动器、输出网络的重构和对窄带z轴恒流驱动器的反馈网络修改以增强稳定性。在进行这些升级过程中开发的工程改进目前正应用于设计和建造具有更高峰值功率能力的下一代混合梯度驱动系统。