ULTRA-WIDEBAND 170 AND 240 GHZ CW SOURCE SWEEPING SYSTEMS

超宽带 170 和 240 GHZ CW 源扫描系统

基本信息

  • 批准号:
    8363967
  • 负责人:
  • 金额:
    $ 0.78万
  • 依托单位:
  • 依托单位国家:
    美国
  • 项目类别:
  • 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

项目摘要

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. Verification and tuning procedures related to bridge setup for ESR spectroscopy are, in general, greatly facilitated by swept-frequency measurement of transmitted/reflected power. Swept-frequency evaluation methods are especially useful in the millimeter-wave regime, and even more so when quasioptical techniques are employed, mainly due to the numerous interacting adjustments and enhanced quasioptical bridge susceptibility to extra-path reflections. As useful as swept measurement capability is, off-the-shelf test and measurement instrumentation providing phase-locked swept-frequency capability at even the lower millimeter-wave regime (i.e., below 100 GHz) is inordinately expensive and, above that frequency range, appears to be available only on an even more expensive custom-built basis. For this reason, ACERT had not previously invested in millimeter-wave swept-measurement capability for its 170 and 250GHz c.w. spectrometer bridges. Last year, ACERT acquired significantly improved millimeter-wave sources of center frequencies at 170 and 240 GHz for its high-field c.w. quasioptical ESR spectrometers. These units generate approximately 12dB more output power than the previous c.w. sources and provide phase-locked operation over a relatively broad frequency range of fc ¿ 5 GHz. In view of the significantly higher output power available from these sources, an extensive program of bridge and resonator design upgrades was undertaken for optimized bridge operation in inductive-reflection mode. During the course of this development work, it became evident not only that swept-frequency measurement capability would be indispensable, but also, conveniently, that these extended-range c.w. sources might be pressed into service for such incidental use. Our work to date in this area has resulted in an interim 170GHz swept-frequency system which has proven extremely useful in the setup and fine-tuning of the H.F. reflection bridge. We have found that, although the swept output power is not actively leveled, the source multiplier stage bias levels may easily be tuned to provide better than 1.2 dB flatness at fc ¿ 1.0GHz and approximately 3dB over the entire source tracking range from 165 to 175GHz. This performance level is more than sufficient for general bridge and resonator tuning procedures. Given the encouraging results thus far, we plan to continue this project over the coming year with similar investigation of the new 240GHz tracking c.w. source for swept measurements. During the coming year, we plan to continue with the design, construction, installation and programming of a simplified operator interface for switching between normal c.w. operation and the swept-frequency diagnostic modes.
该子项目是利用资源的众多研究子项目之一 由 NIH/NCRR 资助的中心拨款提供。子项目的主要支持 并且子项目的主要研究者可能是由其他来源提供的, 包括其他 NIH 来源。 子项目可能列出的总成本 代表子项目使用的中心基础设施的估计数量, NCRR 赠款不直接向子项目或子项目工作人员提供资金。 一般来说,发射/反射功率的扫频测量极大地促进了与 ESR 光谱电桥设置相关的验证和调谐程序。扫频评估方法在毫米波领域特别有用,在采用准光技术时更是如此,这主要是由于大量的相互作用的调整和增强的准光桥对路径外反射的敏感性。尽管扫频测量功能非常有用,但即使在较低毫米波范围(即低于 100 GHz)下提供锁相扫频功能的现成测试和测量仪器也非常昂贵,而在该频率范围之上,似乎只能在更昂贵的定制基础上提供。因此,ACERT 之前并未对其 170 和 250GHz 连续波的毫米波扫频测量能力进行投资。光谱仪桥。 去年,ACERT 为其高场连续波获得了显着改进的中心频率为 170 和 240 GHz 的毫米波源。准光学 ESR 光谱仪。这些装置产生的输出功率比之前的 c.w. 多大约 12dB。源并在相对较宽的频率范围(fc ¿ 5 GHz)上提供锁相操作。 鉴于这些来源可提供明显更高的输出功率,我们实施了广泛的电桥和谐振器设计升级计划,以优化感应反射模式下的电桥操作。在这项开发工作的过程中,我们发现,不仅扫频测量能力是不可或缺的,而且这些扩展范围的连续波测量能力也很方便。资源可能会被强制投入使用以供此类偶然使用。 迄今为止,我们在这一领域的工作已经产生了临时 170GHz 扫频系统,事实证明该系统在高频反射电桥的设置和微调中非常有用。我们发现,虽然扫频输出功率没有主动调节,但可以轻松调整源乘法器级偏置电平,以在 fc ¿ 1.0GHz 处提供优于 1.2 dB 的平坦度,并在 165 至 175GHz 的整个源跟踪范围内提供约 3dB 的平坦度。此性能水平对于一般电桥和谐振器调谐程序来说绰绰有余。鉴于迄今为止令人鼓舞的结果,我们计划在来年继续该项目,对新的 240GHz 跟踪连续波进行类似的调查。扫描测量源。在来年,我们计划继续设计、建造、安装和编程一个简化的操作员界面,用于在正常的连续波和连续波之间切换。操作和扫频诊断模式。

项目成果

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会议论文数量(0)
专利数量(0)

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CURT R DUNNAM其他文献

CURT R DUNNAM的其他文献

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{{ truncateString('CURT R DUNNAM', 18)}}的其他基金

AUTOMATIC FREQUENCY CONTROL (AFC) SYSTEM FOR HIGH-FIELD BRIDGE
高场电桥自动频率控制 (AFC) 系统
  • 批准号:
    8363969
  • 财政年份:
    2011
  • 资助金额:
    $ 0.78万
  • 项目类别:
VACUUM TEMPERATURE INSERT FOR 95 GHZ SPECTROMETRY
用于 95 GHZ 光谱测定的真空温度插件
  • 批准号:
    8364022
  • 财政年份:
    2011
  • 资助金额:
    $ 0.78万
  • 项目类别:
ESR MICROSCOPE MKII HIGH VOLTAGE PREREGULATOR
ESR 显微镜 MKII 高压预调节器
  • 批准号:
    8364083
  • 财政年份:
    2011
  • 资助金额:
    $ 0.78万
  • 项目类别:
SWEPT HETRODYNE MILLIMETER-WAVE VECTOR NETWORK ANALYZER
扫频外差毫米波矢量网络分析仪
  • 批准号:
    8364116
  • 财政年份:
    2011
  • 资助金额:
    $ 0.78万
  • 项目类别:
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
  • 财政年份:
    2011
  • 资助金额:
    $ 0.78万
  • 项目类别:
ESR MICROSCOPE SOFTWARE APPLICATION FOR SAMPLE T2 MEASUREMENT
用于样品 T2 测量的 ESR 显微镜软件应用程序
  • 批准号:
    8364057
  • 财政年份:
    2011
  • 资助金额:
    $ 0.78万
  • 项目类别:
MILLIMETER-WAVE SOURCES MEASUREMENT AND QUALIFICATION FACILITY
毫米波源测量和鉴定设施
  • 批准号:
    8363958
  • 财政年份:
    2011
  • 资助金额:
    $ 0.78万
  • 项目类别:
MODULATION DRIVER WIDEBAND POWER DEVELOPMENT PROJECT
调制驱动器宽带电源开发项目
  • 批准号:
    8363959
  • 财政年份:
    2011
  • 资助金额:
    $ 0.78万
  • 项目类别:
PRECISION FAST PULSED FIELD GRADIENT DRIVER FOR ESR MICROSCOPY
用于 ESR 显微镜的精密快速脉冲场梯度驱动器
  • 批准号:
    8363968
  • 财政年份:
    2011
  • 资助金额:
    $ 0.78万
  • 项目类别:
NANOSECOND RADIOFREQUENCY SWITCH DRIVER DESIGN UPGRADE & HYBRIDIZATION
纳秒射频开关驱动器设计升级
  • 批准号:
    8363941
  • 财政年份:
    2011
  • 资助金额:
    $ 0.78万
  • 项目类别:

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