95 GHZ SPECTROMETER CW LOCK-IN DEMODULATOR UPGRADE

95 GHZ 光谱仪 CW 锁定解调器升级

• 批准号: 7956705
• 负责人: CURT R DUNNAM
• 金额: $ 0.12万
• 依托单位: CORNELL UNIVERSITY
• 依托单位国家: 美国
• 财政年份: 2009
• 资助国家: 美国
• 起止时间: 2009-09-01 至 2010-08-31
• 项目状态: 已结题
• 来源: https://reporter.nih.gov/project-details/7956705
• 关键词: Amplifiers; Autacoids; Computer Retrieval of Information on Scientific Projects Database; Data; Detection; Development; Frequencies; Funding; Grant; Institution; Performance; Phase; Process; Pythons; Research; Research Personnel; Resolution; Resources; Scheme; Signal Transduction; Source; Specimen; Spectrum Analysis; System; Technology; United States National Institutes of Health; Work; Writing; analog; base; detector; digital; instrument; software systems; systems research

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. Continuous-wave spectroscopy with our ACERT 95 GHz instrument has previously utilized a single lock-in amplifier (SRS 510) for detection of the spectral lineshape. We are presently upgrading this subsystem to a digital signal processor (DSP) based lock-in (Stanford Research Systems 850) which offers a number of significant performance advantages over the previous unit. The DSP-based unit has higher dynamic reserve, lower drift, lower distortion and dramatically higher phase resolution than the conventional analog lock-in it is replacing. Additionally, due to the unit's built-in display and processing capabilities, data may be presented to the experimentalist in a range of operationally-useful formats unavailable with the previous lock-in system. The DSP unit graphical display will also facilitate setup and analysis of frequency-modulation detection for FM development work and for broad-line specimens. Integration of the new DSP lock-in amplifier into the 95 GHz spectrometer and implementation of its I/O functions into routines of the spectrometer control system requires modest revision of the control system software. Accordingly, new Python scripting routines are being written prior to replacing the former lock-in with the new DSP system. When the new routines are completed and debugged, we will transfer the spectrometer's c.w. line detection scheme from its existing analog lock-in detector to the DSP lock-in.

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。 使用我们的ACERT 95 GHz仪器的连续波光谱学以前使用单个锁定放大器（SRS 510）来检测光谱线形。我们目前正在将该子系统升级为基于数字信号处理器（DSP）的锁定（斯坦福大学研究系统850），与之前的单元相比，该子系统具有许多显着的性能优势。与它所取代的传统模拟锁定相比，基于DSP的单元具有更高的动态储备、更低的漂移、更低的失真和显着更高的相位分辨率。此外，由于该单元的内置显示和处理能力，数据可以以一系列操作上有用的格式呈现给实验者，这些格式是先前的锁定系统所不可用的。DSP单元的图形显示也将有助于FM开发工作和宽线样品的调频检测的设置和分析。 将新的DSP锁定放大器集成到95 GHz光谱仪中，并将其I/O功能实施到光谱仪控制系统的例程中，需要对控制系统软件进行适度修改。因此，在用新的DSP系统取代以前的锁定之前，正在编写新的Python脚本例程。当新的程序完成并调试好后，我们将把光谱仪的c.w.线检测方案从其现有的模拟锁定检测器到DSP锁定。