Development of Coherent Gradient-Sensing Tomographic Interferometer: Application to 3D Transient Temperature, Concentration, and Refractive Index Measurement

相干梯度传感层析干涉仪的开发：应用于 3D 瞬态温度、浓度和折射率测量

• 批准号: 0079494
• 负责人: Jon Longtin
• 金额: $ 20.74万
• 依托单位: SUNY at Stony Brook
• 依托单位国家: 美国
• 项目类别: Standard Grant
• 财政年份: 2000
• 资助国家: 美国
• 起止时间: 2000-09-01 至 2003-12-31
• 项目状态: 已结题
• 来源: https://www.nsf.gov/awardsearch/showAward?AWD_ID=0079494&HistoricalAwards=false
• 关键词: Development; Coherent; Gradient; Sensing; Tomographic

CTS-0079494Jon P. LongtinState University of New York Stony BrookMRI: Development of a Coherent Gradient-Sensing Tomographic Interferometer: Application to 3D Transient Temperature, Concentration, and Refractive Index Meas-urementAbstractThis project combines a novel interferometric measurement technique, Coherent Gradient-Sensing Interferometry (CGI), with multi-view tomography to develop a powerful new tool for transient, three-dimensional (3D) measurement of temperature, concentration, or density in fluid systems. The unique advantages of CGI over traditional interferometric techniques include: (1) complete insensitivity to vibration, (2) no reference-beam requirement, (3) continuously variable sensitivity, and (4) lower cost, and (5) more reliable operation. These features make a CGI-based instrument particularly well suited for portable and commercial applications. This novel instrument consists of a CGI interferometer capable of rotating around a transparent test cell to capture interferometric images at different angles, which are then used to compute transient, 3-D profiles of thermophysical properties such as temperature, concentration, or density for the fluid-thermal system in the test cell.Measurement of three-dimensional, time-varying profiles of temperature, concentration, and density is critical for the understanding and optimization of many engineering, biological, and geophysical thermal-fluid systems. Examples include advanced materials processing; natural and forced convection, and surface-tension-driven heat transfer; mass transfer, and species pro-duction; and biological and bio-engineering phenomena. Such measurements are needed to vali-date computer simulations of such situations. The successful development of the CGI Tomo-graphic Interferometer provides, for the first time, direct, transient, 3-D measurement capabilities for transport phenomena in fluid-thermal systems. Some immediate applications of the instru-ment will include measuring temperature and concentration during simulated crystal growth, measuring temperatures during laser-induced surface-tension-driven flows, monitoring tracer concentrations in flow through mechanical heart valves, measuring temperature and concentra-tion during melting and solidification, and assessing 3D crack structures in transparent solids. A prototype instrument is also being developed that will be portable and available for other labo-ratories and local companies for evaluation and application. Furthermore, the instrument devel-opment itself is an excellent vehicle for training students in optical systems and image process-ing.

CTS-0079494Jon P.LongtinState University of New York Stony BrookMRI：相干梯度传感层析干涉仪的研制：应用于三维瞬时温度、浓度和折射率测量摘要本项目将一种新的干涉测量技术--相干梯度传感干涉测量(CGI)与多视角层析成像相结合，开发了一种强大的新工具，用于流体系统中温度、浓度或密度的三维(3D)测量。与传统干涉技术相比，CGI的独特优势包括：(1)对振动完全不敏感，(2)不需要参考光束，(3)连续可变的灵敏度，(4)更低的成本，(5)更可靠的操作。这些特点使得基于CGI的仪器特别适合便携式和商业应用。这种新型仪器由CGI干涉仪组成，该干涉仪能够围绕透明测试单元旋转，以捕获不同角度的干涉图像，然后用于计算测试单元中流体-热系统的温度、浓度或密度等热物理性质的三维瞬时分布。测量三维、随时间变化的温度、浓度和密度分布对于了解和优化许多工程、生物和地球物理热-流体系统至关重要。例如，先进的材料加工；自然对流和强迫对流；表面张力驱动的热传递；传质和物种生产；以及生物和生物工程现象。需要这样的测量来验证计算机对这种情况的模拟。CGI断层图像干涉仪的成功开发首次为流体-热系统中的传输现象提供了直接、瞬时、三维测量能力。该仪器的一些直接应用将包括测量模拟晶体生长过程中的温度和浓度，测量激光诱导表面张力驱动的流动过程中的温度，监测通过机械心脏瓣膜的流动中的示踪剂浓度，测量熔化和凝固过程中的温度和浓度，以及评估透明固体中的三维裂纹结构。还在开发一台样机，该仪器将可携带，可供其他实验室和当地公司评估和应用。此外，仪器开发本身也是培训学生光学系统和图像处理的极好工具。