Fluorescence thermometry application of photoluminescence image from Cr-doped YAG

2021 ◽  
Vol 92 (11) ◽  
pp. 114903
Author(s):  
Toru Katsumata ◽  
Nobuyuki Hanami ◽  
Hiroaki Aizawa
Keyword(s):  
Fluorescence Thermometry

scholarly journals Comparison of line-peak and line-scanning excitation in two-color laser-induced-fluorescence thermometry of OH

2009 ◽  
Vol 48 (32) ◽  
pp. 6332 ◽  
Author(s):  
Stanislav Kostka ◽  
Sukesh Roy ◽  
Patrick J. Lakusta ◽  
Terrence R. Meyer ◽  
Michael W. Renfro ◽  
...  
Keyword(s):  
Laser Induced Fluorescence ◽  
Line Scanning ◽  
Fluorescence Thermometry

Exciplex Fluorescence Thermometry of Falling Hexadecane Droplets

1992 ◽  
Vol 114 (2) ◽  
pp. 450-457 ◽  
Author(s):  
T. R. Hanlon ◽  
L. A. Melton
Keyword(s):  
Droplet Radius ◽  
Droplet Volume ◽  
Sharp Rise ◽  
Optical Sampling ◽  
Fluorescence Thermometry ◽  
Exciplex Fluorescence

Exciplex fluorescence thermometry has been used to measure the temperature of 283 micron hexadecane droplets falling through a quiescent, oxygen-free, approximately 500°C ambient. After a period of negligible change, the derived droplet temperatures exhibit a sharp rise of about 100°C followed by a gentle increase to approximately 200°C. The derived temperatures, although averaged over most of the volume of the droplet, still provide some evidence of internal processes in the droplet due to the partially selective optical sampling of the droplet volume, in which fluorescence from the region between 0.50 and 0.75 of the droplet radius contributes disproportionately. At longer times, the droplet is presumed to be approximately homogeneous, and the exciplex fluorescence thermometry measurements provide accurate, interpretable temperatures for the freely falling droplets.

Analysis Tools for Thermally Driven Microfluidics

2010 ◽  
Author(s):  
M. Sigurdson ◽  
C. D. Meinhart
Keyword(s):  
Heat Pipe ◽  
Electronics Cooling ◽  
Velocity Fields ◽  
Microfluidic Systems ◽  
Infrared Thermometry ◽  
Analysis Tools ◽  
Thermally Driven ◽  
Temperature And Velocity Fields ◽  
Fluorescence Thermometry

Thermally driven microfluidics, that is, flow that is driven by a temperature gradient, has applications from lab-on-a-chip to electronics cooling. Development of such devices requires tools to predict and probe temperature and velocity fields. We have developed analytical, numerical, and experimental analysis tools for design and characterization of thermally driven microfluidic systems. We demonstrate these tools through the analysis of two different systems: an electrothermal microstirring biochip, and a high aspect heat pipe for cooling. First, a numerical model is developed for temperature and velocity fields, in a hybrid electrothermal-buoyancy microstirring device. An analytical tool, the electrothermal Rayleigh number, is used to further explore the relative importance of electrothermal and buoyancy driven flow. Finally, two experimental thermometry techniques are described: fluorescence thermometry and infrared thermometry. These analytical, numerical, and experimental tools are useful in the design of thermally driven microfluidic systems, as demonstrated here through the development and analysis of microstirring and heat pipe systems.

Fluorescence Thermometry for Measuring Wall Surface and Bulk Fluid Temperatures

2010 ◽  
Author(s):  
Myeongsub Kim ◽  
Minami Yoda
Keyword(s):  
Heat Transfer ◽  
Spatial Resolution ◽  
Temperature Sensitive ◽  
Wall Surface ◽  
Bulk Fluid ◽  
Surface Temperatures ◽  
Single Temperature ◽  
Heat Transfer Correlations ◽  
Average Uncertainty ◽  
Fluorescence Thermometry

Cooling the next generation of microelectronics with heat fluxes of more than 1 kW/cm2 over hot spots less than 103 μm2 in area will require new single- and two-phase thermal management technologies with micron-scale addressability. Thermal transport models using heat transfer correlations may be the most efficient approach for the initial design and optimization of such micron-scale heat exchangers which will likely involve arrays of microchannels. It is unclear, however, whether classic macroscale convective heat transfer correlations are applicable to these devices given their complex geometries and the possibility of significant thermal coupling between channels. There is therefore a need for new techniques that can measure both bulk fluid and wall surface temperatures at micron-scale spatial resolution without disturbing the flow of coolant. We report here the use of a nonintrusive technique, fluorescence thermometry (FT), to determine bulk fluid temperatures and, for the first time, wall surface temperatures, with a spatial resolution of O(10 μm) for water flowing through a heated channel. Fluorescence thermometry is typically used to estimate temperature distributions in water flows based on variations in the emission intensity of a fluorophore dissolved in the water. The accuracy of FT can be improved by taking the ratio of the emission signals from two different fluorophores (dual-tracer FT, or DFT) to eliminate variations in the signal due to (spatial and temporal) variations in the excitation intensity. In this work, two temperature-sensitive fluorophores, fluorescein and sulforhodamine B, with emission intensities that increase and decrease, respectively, with increasing temperature, are used to further improve the accuracy of the temperature measurements. Temperature profiles were measured in the steady Poiseuille flow of water at Reynolds numbers of 3.3 and 8.3 through a 1 mm square channel heated with a thin-fim heater. Temperatures in the bulk flow were measured using DFT with an average uncertainty of 0.2 °C at a spatial resolution of 30 μm. Fluid temperatures within the first 0.3 μm next to the wall were measured using evanescent-wave illumination of a single temperature-sensitive fluorophore with an average uncertainty of less than 0.2 °C at a spatial resolution of 10 μm. The results are compared with numerical predictions, which suggest that the fluid temperatures within 0.3 μm are effectively the wall surface temperature.

Facile measurement of surface heat loss from polymer thin films via fluorescence thermometry

2017 ◽  
Vol 56 (8) ◽  
pp. 643-652 ◽  
Author(s):  
Gabriel Firestone ◽  
Jason R. Bochinski ◽  
Jeffrey S. Meth ◽  
Laura I. Clarke
Keyword(s):  
Thin Films ◽  
Heat Loss ◽  
Polymer Thin Films ◽  
Surface Heat ◽  
Fluorescence Thermometry

Atomic Fluorescence Study of High Temperature Aerodynamic Levitation

1981 ◽  
Vol 9 ◽  
Author(s):  
Paul C. Nordine ◽  
Robert A. Schiffman ◽  
D. S. Sethi
Keyword(s):  
High Temperature ◽  
Supersonic Jet ◽  
Ideal Gas ◽  
Thermal Gradients ◽  
Fluorescence Study ◽  
Atomic Fluorescence ◽  
Argon Gas ◽  
Supersonic Jet Expansion ◽  
Aerodynamic Levitation ◽  
Fluorescence Thermometry

ABSTRACTUltraviolet laser induced atomic fluorescence has been used to characterize supersonic jet aerodynamic levitation experiments. The levitated specimen was a 0.4 cm sapphire sphere that was separately heated at temperatures up to 2327K by an infrared laser. The supersonic jet expansion and thermal gradients in the specimen wake were studied by measuring spatial variations in the concentration of atomic Hg added to the levitating argon gas stream. Further applications of atomic fluorescence in containerless experiments, such as ideal gas fluorescence thermometry and containerless process control are discussed.

Monitoring of Thermal Dose During Ablation Therapy Using Quantum Dot-Mediated Fluorescence Thermometry

2010 ◽  
Vol 24 (12) ◽  
pp. 1903-1908 ◽  
Author(s):  
Karim Bensalah ◽  
Altug Tuncel ◽  
Willard Hanson ◽  
Joshua Stern ◽  
Bumsoo Han ◽  
...  
Keyword(s):  
Quantum Dot ◽  
Thermal Dose ◽  
Ablation Therapy ◽  
Fluorescence Thermometry

Retracted Article: Intracellular fluorescent thermometry and photothermal-triggered drug release developed from gold nanoclusters and doxorubicin dual-loaded liposomes

2014 ◽  
Vol 50 (13) ◽  
pp. 1546-1548 ◽  
Author(s):  
Rijun Gui ◽  
Ajun Wan ◽  
Xifeng Liu ◽  
Hui Jin
Keyword(s):  
Drug Release ◽  
Gold Nanoclusters ◽  
Retracted Article ◽  
Triggered Drug Release ◽  
Intracellular Fluorescence ◽  
Fluorescence Thermometry

Gold nanoclusters and doxorubicin dual-loaded liposomes were prepared and developed toward intracellular fluorescence thermometry and photothermal-triggered drug release.

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