LOW POWER PULSE SPECTROMETER AT 170 & 240 GHZ

170 低功率脉冲光谱仪

• 批准号: 8363957
• 负责人: KEITH A EARLE
• 金额: $ 0.14万
• 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/8363957
• 关键词: Development; Frequencies; Funding; Grant; National Center for Research Resources; Nature; Phase; Physiologic pulse; Principal Investigator; Process; Relaxation; Research; Research Infrastructure; Resources; Source; Techniques; Technology; Temperature; Time; United States National Institutes of Health; Work; cost; millimeter; operation; research study; retinal rods

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. With the recent purchase of powerful continuous wave (cw) sources at millimeter wave frequencies the possibility of performing low power pulse work becomes an intriguing possibility. Recent cw experiments with these sources have demonstrated spectral saturation effects over a range of temperatures from 100K to 250K which may be observed by varying the incident millimeter wave power. Due to the modular nature of the source construction it is straightforward to introduce inexpensive, efficient, rf switches at a convenient point in the frequency multiplier chain (10 - 15GHz) to achieve well-defined pulses at the desired millimeter wave frequency. It would also be possible to introduce rf phase shifters at the same time as the switches to achieve the capability of performing phase cycling operations on these low power pulses. This is possible due to the coherent nature of the multiplication process. Implementation of these ideas will depend on the availability of suitable funding. Even with the current setup, however, we can continue to explore saturation effects, which, when analyzed properly, may be used to infer longitudinal relaxation times which are otherwise difficult to obtain at high frequencies. The further development of the dielectric rod resonator with its B1 enhancing capabilities will also be extremely useful in pursuing these studies. The techniques we have developed on the HF/HF cw spectrometer may also be of use on our 95GHz spectrometer, and we will explore these possibilities as time and other resources permit.

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。 随着最近在毫米波频率下购买强大的连续波（CW）源，进行低功率脉冲工作的可能性成为一种有趣的可能性。 这些来源最近进行的CW实验表明，在100K至250K的一系列温度中，光谱饱和效应效应可以通过改变入射毫米波功率来观察到。 由于源结构的模块化性质，在频率乘数链（10-15GHz）的方便点引入廉价，高效的RF开关非常简单，以在所需的毫米波频率下实现明确定义的脉冲。 也可以在开关的同一时间引入RF相位变速器，以实现对这些低功率脉冲进行相位循环操作的能力。 由于乘法过程的连贯性质，这是可能的。 这些想法的实施将取决于合适的资金的可用性。 但是，即使使用当前的设置，我们也可以继续探索饱和效应，如果正确分析，可以使用这些效果来推断纵向放松时间，否则在高频下很难获得。 具有B1增强功能的介电杆谐振器的进一步开发在进行这些研究方面也非常有用。 我们在HF/HF CW光谱仪上开发的技术也可能在95GHz光谱仪上使用，我们将在时间和其他资源允许的情况下探索这些可能性。