Spatially Resolved Diagnostics Using Tunable Laser Absorption Spectroscopy
使用可调谐激光吸收光谱进行空间分辨诊断
基本信息
- 批准号:9215080
- 负责人:
- 金额:$ 28.57万
- 依托单位:
- 依托单位国家:美国
- 项目类别:Continuing Grant
- 财政年份:1992
- 资助国家:美国
- 起止时间:1992-09-01 至 1996-08-31
- 项目状态:已结题
- 来源:
- 关键词:
项目摘要
Accurate measurements of temperature and species concentrations are important for characterization of high temperature gas flows, particularly in the area of combustion. Optical measurements are desirable since they are nonintrusive, nonperturbing, and the probe is not subject to a hostile environment. An absorption measurement provides a simple quantitative definition of the concentration of the absorbing specie along a line-of-sight; this is sometimes adequate information, but more often spatially resolved measurements are needed. In principle, two-dimensional temperature and concentration fields should be recoverable from a limited number of line-of-sight measurements using tomographic reconstruction, a method widely used in medical imaging. However, accurate quantitative reconstructions of temperature and concentration fields have been difficult to achieve because reconstruction algorithms are very sensitive to errors in the input data. The principal objective of this program is to measure temperature and concentration fields simultaneously using a reconstruction technique that exploits the tuning capability of infrared diode lasers to greatly reduce the sensitivity of the reconstruction methods to both random and systematic errors in the input data. The study will begin with reconstruction of radial temperature and concentration profiles (CO and CO2) in an axisymmetric flow, with subsequent extension of the procedures to reconstruction of two-dimensional sections of three-dimensional flows. The application of quantitative laser diagnostics to industrial scenarios has been hampered by the typical high cost of equipment involved and by the user sophistication required for achievement of quantitative results. Success with the these lower-cost, more user-friendly systems may well lead to wider usage in industry; the software and hardware developed should enable implementation of tomographic absorption diagnostic techniques in a wide variety of applications. Potentially, further development of this technology, with use of inexpensive laser diode sources, may allow instrumentation packages cheap and robust enough for use in in-plant process control systems.
准确测量温度和组分浓度对于表征高温气体流动非常重要,特别是在燃烧领域。光学测量是可取的,因为它们是非侵入性的、非扰动的,并且探头不受恶劣环境的影响。吸收测量提供了沿视线方向的吸收物种浓度的简单定量定义;这有时是足够的信息,但更多情况下需要空间分辨测量。原则上,二维温度和浓度场应该可以通过使用断层重建的有限数量的视线测量恢复,这是一种在医学成像中广泛使用的方法。然而,温度和浓度场的精确定量重建一直难以实现,因为重建算法对输入数据中的误差非常敏感。该计划的主要目标是使用重建技术同时测量温度和浓度场,该重建技术利用红外二极管激光器的调谐能力,大大降低重建方法对输入数据中随机和系统误差的敏感度。这项研究将从重建轴对称流动中的径向温度和浓度分布(CO和CO2)开始,随后将程序扩展到重建三维流动的二维截面。定量激光诊断在工业场景中的应用一直受到所涉及设备的典型高成本和实现定量结果所需的用户复杂性的阻碍。这些成本更低、用户更友好的系统的成功很可能会在工业中得到更广泛的使用;开发的软件和硬件应该能够在各种应用中实施断层吸收诊断技术。潜在地,这项技术的进一步发展,使用廉价的激光二极管光源,可能使仪表组件足够便宜和坚固,可以用于工厂内的过程控制系统。
项目成果
期刊论文数量(0)
专著数量(0)
科研奖励数量(0)
会议论文数量(0)
专利数量(0)
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Philip Varghese其他文献
Modeling rarefied gas chemistry with QuiPS, a novel quasi-particle method
- DOI:
10.1007/s00162-021-00598-4 - 发表时间:
2022-01-24 - 期刊:
- 影响因子:2.800
- 作者:
Yasvanth Poondla;David Goldstein;Philip Varghese;Peter Clarke;Christopher Moore - 通讯作者:
Christopher Moore
Hernia referral pathway – Streamlining patient referral pathway to deliver a cost effective, efficient patient centred care
- DOI:
10.1016/j.ijsu.2014.07.086 - 发表时间:
2014-11-01 - 期刊:
- 影响因子:
- 作者:
Philip Varghese;Parminderjit Jayia;William Fusi-Rubiano;Frank Curran;Mangta Manu - 通讯作者:
Mangta Manu
Improving PIC-DSMC Simulations of RF Plasmas via Event Splitting.
通过事件分裂改进射频等离子体的 PIC-DSMC 仿真。
- DOI:
10.2172/2003839 - 发表时间:
2022 - 期刊:
- 影响因子:0
- 作者:
Georgii Oblapenko;David Goldstein;Philip Varghese;Christopher Moore - 通讯作者:
Christopher Moore
Topography formation driven by sublimation of pure species on icy airless worlds
冰冷无空气世界上纯物种升华驱动的地形形成
- DOI:
10.1016/j.icarus.2024.116043 - 发表时间:
2024 - 期刊:
- 影响因子:3.2
- 作者:
Antonio Macias;D. Berisford;David Goldstein;Philip Varghese;Laurence Trafton;Jordan Steckloff;K. Hand - 通讯作者:
K. Hand
Neoadjuvant chemo-radiotherapy and lymph node retrieval rates after curative resection for rectal cancers- should the same standards apply?
- DOI:
10.1016/j.ijsu.2012.06.161 - 发表时间:
2012-01-01 - 期刊:
- 影响因子:
- 作者:
Philip Varghese;Zakir Mohamed;Fadlo Shaban;Talvinder Gill;Mohammed Tabaqchali;Dharmendra Garg;David Borowski;Anil Agarwal - 通讯作者:
Anil Agarwal
Philip Varghese的其他文献
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{{ truncateString('Philip Varghese', 18)}}的其他基金
Highly efficient numerical solution of the Boltzmann equation for practical applications
玻尔兹曼方程的实际应用的高效数值求解
- 批准号:
1438530 - 财政年份:2014
- 资助金额:
$ 28.57万 - 项目类别:
Standard Grant
MRI: Novel Laser Velocimeter Using Modulated Filtered Rayleigh Scattering
MRI:使用调制滤波瑞利散射的新型激光测速仪
- 批准号:
9871249 - 财政年份:1998
- 资助金额:
$ 28.57万 - 项目类别:
Standard Grant
Development of an Expert System for High Resolution Diode Laser Spectroscopy
高分辨率二极管激光光谱专家系统的开发
- 批准号:
8604411 - 财政年份:1986
- 资助金额:
$ 28.57万 - 项目类别:
GAA
Research Initiation: Laser Absorption Measurements on Formaldehyde
研究启动:甲醛激光吸收测量
- 批准号:
8404277 - 财政年份:1984
- 资助金额:
$ 28.57万 - 项目类别:
Standard Grant
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