LOW POWER PULSE SPECTROMETER AT 170 & 240 GHZ

170 低功率脉冲光谱仪

• 批准号: 8172086
• 负责人: KEITH A EARLE
• 金额: $ 0.09万
• 依托单位: CORNELL UNIVERSITY
• 依托单位国家: 美国
• 财政年份: 2010
• 资助国家: 美国
• 起止时间: 2010-09-01 至 2011-08-31
• 项目状态: 已结题
• 来源: https://reporter.nih.gov/project-details/8172086
• 关键词: Computer Retrieval of Information on Scientific Projects Database; Development; Frequencies; Funding; Grant; Institution; Nature; Phase; Physiologic pulse; Process; Relaxation; Research; Research Personnel; Resources; Source; Techniques; Temperature; Time; United States National Institutes of Health; Work; 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. 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. 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.

这个子项目是许多研究子项目中的一个 由NIH/NCRR资助的中心赠款提供的资源。子项目和 研究者（PI）可能从另一个NIH来源获得了主要资金， 因此可以在其他CRISP条目中表示。所列机构为 研究中心，而研究中心不一定是研究者所在的机构。 随着最近购买的强大的连续波（cw）源在毫米波频率进行低功率脉冲工作的可能性成为一个有趣的可能性。 最近的连续波实验表明，这些源的光谱饱和效应的温度范围从100 K到250 K，这可以通过改变入射毫米波功率观察。 由于源结构的模块化性质，可以直接在倍频器链（10 - 15 GHz）中的方便点处引入廉价、高效的射频开关，以在所需的毫米波频率下实现定义良好的脉冲。 还可以在开关的同时引入rf移相器，以实现对这些低功率脉冲执行相位循环操作的能力。 这是可能的，因为乘法过程的连贯性。 这些想法的实施将取决于是否有适当的资金。 然而，即使使用当前的设置，我们也可以继续探索饱和效应，当适当分析时，可以用来推断在高频下难以获得的纵向弛豫时间。 进一步发展具有B1增强能力的介质棒谐振器也将对这些研究非常有用。 我们在HF/HF连续谱仪上开发的技术也可能在我们的95 GHz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。