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.

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。 ACERT 目前拥有 5 个 c.w.和 1 个脉冲毫米波源，输出功率范围约为 1mW 至 1.2KW。在中心拨款期间，我们越来越需要这些源的鉴定、维护和校准服务。为此，我们组装了完成这项任务所需的测试和测量仪器，并建立了应用这些工具的方案。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，我们预留了一个测试区域，可以忠实、快速地再现必要的测量设置。对于准光功率测量，我们依靠 Thomas Keating Ltd.“TK TeraHertz”入射功率计系统，在校正波长和光束轮廓时，绝对校准精度约为 20%。频率和频谱特性通过 Tektronix 492 型频谱分析仪测量，使用一组覆盖 20 至 325 GHz 的校准谐波波导检测器。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结果对实际工作频率不高度敏感，也不透露实际工作频率。另一方面，频谱分析仪可以对工作频率进行相对准确的测量，并对实际输出频谱进行良好的定性测量，但在给定频率下的绝对功率方面校准较差。然而，在两个测量系统之间，可以实现功率、波长/频率和光谱特性的良好互补测量。时间响应可以通过在检测器模式下直接观察适当的波导谐波混频器输出来测量，也可以通过解释频谱分析仪观察到的频域频谱来间接测量。