MILLIMETER-WAVE SOURCES MEASUREMENT AND QUALIFICATION FACILITY

毫米波源测量和鉴定设施

• 批准号: 8363958
• 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/8363958
• 关键词: Address; Area; Calibration; Characteristics; Devices; Frequencies; Funding; Grant; Maintenance; Measurement; Measures; Modeling; National Center for Research Resources; Noise; Output; Physiologic pulse; Principal Investigator; Regimen; Research; Research Infrastructure; Resources; Services; Source; System; Technology; Testing; United States National Institutes of Health; cost; detector; instrumentation; meter; millimeter; response; tool

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. ACERT presently possesses 5 c.w. and 1 pulsed millimeter-wave sources, ranging in output power from approximately 1mW to 1.2KW. During the course of the Center grant period, we have increasingly required qualification, maintenance, and calibration services for these sources. To this end, we have assembled test and measurement instrumentation necessary to accomplish this task, and have established a regimen for applying these tools to it. The fundamental measurements are power, wavelength/frequency, spectral characteristics (including noise power) and, for pulse devices, temporal response. To address these needs, a test area has been set aside where the necessary measurement setups may be faithfully and quickly reproduced. For our quasioptical power measurements, we rely on a Thomas Keating Ltd. "TK TeraHertz" incident power meter system, with an absolute calibration accuracy of approximately 20% when corrected for wavelength and beam profile. Frequency and spectral characteristics are measured by means of a Tektronix model 492 spectrum analyzer, using a set of calibrated harmonic waveguide detectors covering 20 through 325 GHz. Because the TK power meter is relatively insensitive to wavelength, it produces a calibrated power measurement which is not highly sensitive to nor revealing with respect to the actual operating frequency. The spectrum analyzer, on the other hand, produces a relatively accurate measurement of the operating frequency and good qualitative measurement of the actual output spectrum, but is poorly calibrated with respect to absolute power at a given frequency. Between the two measurement systems, however, a good complementary measurement of power, wavelength/frequency and spectral characteristics is achievable. Temporal response is measured either by direct observation of an appropriate waveguide harmonic mixer output in detector mode, or indirectly, by interpretation of the frequency-domain spectrum observed with the spectrum analyzer.

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。 Acert目前拥有5个C.W.1个脉冲毫米波源，输出功率从大约1 mW到1.2kw不等。在中心资助期间，我们对这些来源的鉴定、维护和校准服务的需求越来越大。为此，我们组装了完成这项任务所需的测试和测量仪器，并建立了将这些工具应用于该任务的方案。基本测量包括功率、波长/频率、光谱特性(包括噪声功率)以及脉冲器件的时间响应。为了满足这些需求，已经留出了一个测试区，在那里可以忠实而快速地复制必要的测量设置。对于我们的准光功率测量，我们依靠托马斯·基廷有限公司。“TK太赫兹”入射功率计系统，经波长和光束轮廓校正后，绝对校准精度约为20%。频率和频谱特性是通过Tektronix 492型频谱分析仪测量的，使用一组覆盖20到325 GHz的校准谐波波导探测器。由于TK功率计对波长相对不敏感，因此它产生的校准功率测量对实际工作频率不是高度敏感，也不会显示。另一方面，频谱分析仪对工作频率的测量相对准确，对实际输出频谱的定性测量较好，但在给定频率下的绝对功率校准较差。然而，在这两个测量系统之间，可以实现对功率、波长/频率和光谱特性的良好互补测量。时间响应的测量方法有两种，一种是直接观察探测器模式下适当的波导混频输出，另一种是通过解译频谱分析仪观测到的频域频谱来间接测量时间响应。