Laser-induced fluorescence or LED-induced fluorescence (LIF) is a spectroscopic method used for studying structure of molecules, detection of selective species and flow visualization and measurements.
The species to be examined is excited with a laser. The wavelength is often selected to be the one at which the species has its largest cross section. The excited species will after some time, usually in the order of few nanoseconds to microseconds, de-excite and emit light at a wavelength longer than the excitation wavelength. This fluorescent light is typically recorded with a photomultiplier tube (PMT) or Filtered Photodiodes.
Two different kinds of spectra exist, disperse spectra and excitation spectra.
The disperse spectra are performed with a fixed lasing wavelength, as above and the fluorescence spectrum is analyzed. Excitation scans on the other hand collect fluorescent light at a fixed emission wavelength or range of wavelengths. Instead the lasing wavelength is changed.
eCHEM 1A: Online General Chemistry
College of Chemistry, University of California, Berkeley
http://chemistry.berkeley.edu/echem1a
Curriculum and ChemQuizzes developed by Dr. Mark Kubinec and Professor Alexander Pines
Chemical Demonstrations by Lonnie Martin
Video Production by Jon Schainker and Scott Vento
Developed with the support of The Camille & Henry Dreyfus Foundation
published: 13 Aug 2012
Laser induced fluorescence experiment
In the experiment we 3 types of lasers: red 650 nm, green 532 nm, blue 450 nm.
Here we used various concentrations of chlorophyll and fluorescein and olive oil as fluorescence liquids. As a bonus we used glow sand with fluorescence and phosphorescence.
Prepared test tubes.
Low concentration chlorophyll
Medium concentration chlorophyll
High concentration chlorophyll
Olive oil
Fluorescent Bright Glow-in-the-Dark Sand Particles
Low concentration fluorescein liquid
Medium concentration fluorescein liquid
High concentration fluorescein liquid
If you have any more questions please contact : Dr. Juraj Kajan, [email protected]
Learn more about Endurance lasers
https://EnduranceLasers.com
https://Endurance-Lasers.com
published: 27 Oct 2020
LIF for Gas Thermometry
Do you know the secret behind efficient temperature mapping of flows using Laser induced Fluorescence (LIF)?
It’s all about attention to detail!
⭐ LaVision offers a 2-color ratiometric LIF to measure temperatures accurately, regardless of tracer density variations or laser intensity fluctuations.
⭐ The anisole seeding generator, developed with the expertise of Bronkhorst Deutschland Nord GmbH, provides precise and dynamic control of the tracer distribution in the thermal jet.
⭐ The used Anisole tracer generates higher LIF signal at much lower seeding density compared to traditional acetone tracers.
⭐ The DaVis LIF software package performs the multi-step processing sequence including background and white field correction, with a single click!
published: 01 Dec 2021
Integrated spectroscopy sensor system for laser-induced fluorescence and hyperspectral imaging
European experts within the inSPECtor project have developed a modular system integrating sensors for reflectance and Laser induced Fluorescence (LiF) measurement with associated data processing routines for drill core logging and detection of Rare Earth Elements (REEs).This technology allows for much faster analyses for raw materials in an environmentally friendly way and at decreases costs, contributing to a green energy production and a circular economy - for a sustainable future and a responsible and efficient resource use.
Funding Agency: EIT Raw Materials
Project partners: TU Berkgakademie Freiberg, Freiberg Instruments GmbH, SPECIM- Spectral Imaging Ltd. ,Geological Survey of Finland (GTK), HZDR/HIF
published: 02 Nov 2020
Laser Induced Fluorescence
Prof. Lotfia M. EL Nadi
Physics Department, Faculty of Science, Cairo University, GIZA, EGYPT.
NILES, CA-SAS for High Density Lasers, Cairo University, GIZA, EGYPT.
E-mail: [email protected]
Laser-Induced Fluorescence (LIF) is an optical spectroscopic technique where a sample is excited with a laser, and the fluorescence emitted by the sample is subsequently captured by a photodetector. LIF can be understood as a class of fluorescence spectroscopy where the usual lamp excitation is replaced by a laser source. Whilst lasers are now routinely used as excitation sources in photoluminescence spectrometers, LIF was not originally developed for a commercial instrument but as a standalone laser spectroscopy technique. LIF spectroscopy was used for the detection of atoms and molecules in the...
published: 05 Jan 2023
What is Fluorescence?
Ever wonder what makes your t-shirt glow under a black light? Or why the ink of a highlighter seems un-naturally bright? Dr. Brian Wagner, professor of chemistry at the University of Prince Edward Island, explains the science behind fluorescence, and how we see it around us every day.
Learn more about Dr. Wagner and his research at https://islandscholar.ca/people/bwagner
published: 18 Jul 2013
Planar Laser Induced Fluorescence
Planar laser induced fluorescence measurements of a passive scalar plume in uniform flow using Rhodamine 6G.
published: 10 Sep 2015
Planar Laser-Induced Fluorescence (LIF) - Turbulent Flow Visualisation of a Weak Free-Surface Vortex
Authors: Sean Mulligan, John Casserly & Dr.Richard Sherlock
PhD Project Title - Experimental and Numerical Analysis of Three-Dimensional Free-Surface Turbulent Vortex Flows with Strong Circulation
Institute of Technology, Sligo
School of Engineering and Design
Centre for Environmental Research Innovation and Sustainability (CERIS)
For more details on experiment contact:
[email protected] or
[email protected]
Here we investigate the turbulent flow field of a weak vortex structure as it forms over a horizontal intake. When the critical submergence is reached, a full air core extends to the intake resulting in a relatively steady circulatory flow field. The tangential velocity varies inversely with the radius from the intake thus forming a highly turbulent vortex core re...
published: 10 Jun 2015
LASER induced fluorescence : The glow sticks that last forever
By avoiding a chemical reaction that would limit their life. These will not die due to exhaustion in a one way reaction.
published: 30 Aug 2016
CHEM 4511 - Laser Induced Fluorescence of Iodine
Laser Induced Fluorescence of Iodine for CHEM 4511W - Advanced Physical Chemistry Lab at the University of Minnesota Twin Cities
Music:
Punchinello, Written and performed by Ken Leopold
https://www.youtube.com/watch?v=inSSALPSru0
eCHEM 1A: Online General Chemistry
College of Chemistry, University of California, Berkeley
http://chemistry.berkeley.edu/echem1a
Curriculum and ChemQuizzes de...
eCHEM 1A: Online General Chemistry
College of Chemistry, University of California, Berkeley
http://chemistry.berkeley.edu/echem1a
Curriculum and ChemQuizzes developed by Dr. Mark Kubinec and Professor Alexander Pines
Chemical Demonstrations by Lonnie Martin
Video Production by Jon Schainker and Scott Vento
Developed with the support of The Camille & Henry Dreyfus Foundation
eCHEM 1A: Online General Chemistry
College of Chemistry, University of California, Berkeley
http://chemistry.berkeley.edu/echem1a
Curriculum and ChemQuizzes developed by Dr. Mark Kubinec and Professor Alexander Pines
Chemical Demonstrations by Lonnie Martin
Video Production by Jon Schainker and Scott Vento
Developed with the support of The Camille & Henry Dreyfus Foundation
In the experiment we 3 types of lasers: red 650 nm, green 532 nm, blue 450 nm.
Here we used various concentrations of chlorophyll and fluorescein and olive oi...
In the experiment we 3 types of lasers: red 650 nm, green 532 nm, blue 450 nm.
Here we used various concentrations of chlorophyll and fluorescein and olive oil as fluorescence liquids. As a bonus we used glow sand with fluorescence and phosphorescence.
Prepared test tubes.
Low concentration chlorophyll
Medium concentration chlorophyll
High concentration chlorophyll
Olive oil
Fluorescent Bright Glow-in-the-Dark Sand Particles
Low concentration fluorescein liquid
Medium concentration fluorescein liquid
High concentration fluorescein liquid
If you have any more questions please contact : Dr. Juraj Kajan, [email protected]
Learn more about Endurance lasers
https://EnduranceLasers.com
https://Endurance-Lasers.com
In the experiment we 3 types of lasers: red 650 nm, green 532 nm, blue 450 nm.
Here we used various concentrations of chlorophyll and fluorescein and olive oil as fluorescence liquids. As a bonus we used glow sand with fluorescence and phosphorescence.
Prepared test tubes.
Low concentration chlorophyll
Medium concentration chlorophyll
High concentration chlorophyll
Olive oil
Fluorescent Bright Glow-in-the-Dark Sand Particles
Low concentration fluorescein liquid
Medium concentration fluorescein liquid
High concentration fluorescein liquid
If you have any more questions please contact : Dr. Juraj Kajan, [email protected]
Learn more about Endurance lasers
https://EnduranceLasers.com
https://Endurance-Lasers.com
Do you know the secret behind efficient temperature mapping of flows using Laser induced Fluorescence (LIF)?
It’s all about attention to detail!
⭐ LaVision of...
Do you know the secret behind efficient temperature mapping of flows using Laser induced Fluorescence (LIF)?
It’s all about attention to detail!
⭐ LaVision offers a 2-color ratiometric LIF to measure temperatures accurately, regardless of tracer density variations or laser intensity fluctuations.
⭐ The anisole seeding generator, developed with the expertise of Bronkhorst Deutschland Nord GmbH, provides precise and dynamic control of the tracer distribution in the thermal jet.
⭐ The used Anisole tracer generates higher LIF signal at much lower seeding density compared to traditional acetone tracers.
⭐ The DaVis LIF software package performs the multi-step processing sequence including background and white field correction, with a single click!
Do you know the secret behind efficient temperature mapping of flows using Laser induced Fluorescence (LIF)?
It’s all about attention to detail!
⭐ LaVision offers a 2-color ratiometric LIF to measure temperatures accurately, regardless of tracer density variations or laser intensity fluctuations.
⭐ The anisole seeding generator, developed with the expertise of Bronkhorst Deutschland Nord GmbH, provides precise and dynamic control of the tracer distribution in the thermal jet.
⭐ The used Anisole tracer generates higher LIF signal at much lower seeding density compared to traditional acetone tracers.
⭐ The DaVis LIF software package performs the multi-step processing sequence including background and white field correction, with a single click!
European experts within the inSPECtor project have developed a modular system integrating sensors for reflectance and Laser induced Fluorescence (LiF) measureme...
European experts within the inSPECtor project have developed a modular system integrating sensors for reflectance and Laser induced Fluorescence (LiF) measurement with associated data processing routines for drill core logging and detection of Rare Earth Elements (REEs).This technology allows for much faster analyses for raw materials in an environmentally friendly way and at decreases costs, contributing to a green energy production and a circular economy - for a sustainable future and a responsible and efficient resource use.
Funding Agency: EIT Raw Materials
Project partners: TU Berkgakademie Freiberg, Freiberg Instruments GmbH, SPECIM- Spectral Imaging Ltd. ,Geological Survey of Finland (GTK), HZDR/HIF
European experts within the inSPECtor project have developed a modular system integrating sensors for reflectance and Laser induced Fluorescence (LiF) measurement with associated data processing routines for drill core logging and detection of Rare Earth Elements (REEs).This technology allows for much faster analyses for raw materials in an environmentally friendly way and at decreases costs, contributing to a green energy production and a circular economy - for a sustainable future and a responsible and efficient resource use.
Funding Agency: EIT Raw Materials
Project partners: TU Berkgakademie Freiberg, Freiberg Instruments GmbH, SPECIM- Spectral Imaging Ltd. ,Geological Survey of Finland (GTK), HZDR/HIF
Prof. Lotfia M. EL Nadi
Physics Department, Faculty of Science, Cairo University, GIZA, EGYPT.
NILES, CA-SAS for High Density Lasers, Cairo University, GIZA, ...
Prof. Lotfia M. EL Nadi
Physics Department, Faculty of Science, Cairo University, GIZA, EGYPT.
NILES, CA-SAS for High Density Lasers, Cairo University, GIZA, EGYPT.
E-mail: [email protected]
Laser-Induced Fluorescence (LIF) is an optical spectroscopic technique where a sample is excited with a laser, and the fluorescence emitted by the sample is subsequently captured by a photodetector. LIF can be understood as a class of fluorescence spectroscopy where the usual lamp excitation is replaced by a laser source. Whilst lasers are now routinely used as excitation sources in photoluminescence spectrometers, LIF was not originally developed for a commercial instrument but as a standalone laser spectroscopy technique. LIF spectroscopy was used for the detection of atoms and molecules in the gas phase. Laser Induced Fluorescence offers interesting advantages over absorption spectroscopy. In addition, polarization-dependent measurements are easy to implement. One of the first applications of LIF spectroscopy was measuring the temperature of gas-phase samples, and today it is widely used for the analysis of flames. The technique soon moved beyond gas samples and into the liquid phase, as it became a detection technique in liquid chromatography and capillary electrophoresis (CE-LIF). Nowadays, LIF detection can be found in many contexts, from commercial analytical instruments to advanced microscopy experiments, and it is routinely used in biological and environmental research as well as fundamental spectroscopy studies
Keywords: Laser Induced Fluorescence; Photoluminescence; Photodetector; Absorption spectroscopy; Spectrometer; Time-resolved LIF
Prof. Lotfia M. EL Nadi
Physics Department, Faculty of Science, Cairo University, GIZA, EGYPT.
NILES, CA-SAS for High Density Lasers, Cairo University, GIZA, EGYPT.
E-mail: [email protected]
Laser-Induced Fluorescence (LIF) is an optical spectroscopic technique where a sample is excited with a laser, and the fluorescence emitted by the sample is subsequently captured by a photodetector. LIF can be understood as a class of fluorescence spectroscopy where the usual lamp excitation is replaced by a laser source. Whilst lasers are now routinely used as excitation sources in photoluminescence spectrometers, LIF was not originally developed for a commercial instrument but as a standalone laser spectroscopy technique. LIF spectroscopy was used for the detection of atoms and molecules in the gas phase. Laser Induced Fluorescence offers interesting advantages over absorption spectroscopy. In addition, polarization-dependent measurements are easy to implement. One of the first applications of LIF spectroscopy was measuring the temperature of gas-phase samples, and today it is widely used for the analysis of flames. The technique soon moved beyond gas samples and into the liquid phase, as it became a detection technique in liquid chromatography and capillary electrophoresis (CE-LIF). Nowadays, LIF detection can be found in many contexts, from commercial analytical instruments to advanced microscopy experiments, and it is routinely used in biological and environmental research as well as fundamental spectroscopy studies
Keywords: Laser Induced Fluorescence; Photoluminescence; Photodetector; Absorption spectroscopy; Spectrometer; Time-resolved LIF
Ever wonder what makes your t-shirt glow under a black light? Or why the ink of a highlighter seems un-naturally bright? Dr. Brian Wagner, professor of chemistr...
Ever wonder what makes your t-shirt glow under a black light? Or why the ink of a highlighter seems un-naturally bright? Dr. Brian Wagner, professor of chemistry at the University of Prince Edward Island, explains the science behind fluorescence, and how we see it around us every day.
Learn more about Dr. Wagner and his research at https://islandscholar.ca/people/bwagner
Ever wonder what makes your t-shirt glow under a black light? Or why the ink of a highlighter seems un-naturally bright? Dr. Brian Wagner, professor of chemistry at the University of Prince Edward Island, explains the science behind fluorescence, and how we see it around us every day.
Learn more about Dr. Wagner and his research at https://islandscholar.ca/people/bwagner
Authors: Sean Mulligan, John Casserly & Dr.Richard Sherlock
PhD Project Title - Experimental and Numerical Analysis of Three-Dimensional Free-Surface Turbulent...
Authors: Sean Mulligan, John Casserly & Dr.Richard Sherlock
PhD Project Title - Experimental and Numerical Analysis of Three-Dimensional Free-Surface Turbulent Vortex Flows with Strong Circulation
Institute of Technology, Sligo
School of Engineering and Design
Centre for Environmental Research Innovation and Sustainability (CERIS)
For more details on experiment contact:
[email protected] or
[email protected]
Here we investigate the turbulent flow field of a weak vortex structure as it forms over a horizontal intake. When the critical submergence is reached, a full air core extends to the intake resulting in a relatively steady circulatory flow field. The tangential velocity varies inversely with the radius from the intake thus forming a highly turbulent vortex core region dominated by the effects of eddy viscosity (Einstein and Li, 1951; Anwar 1969).
The planar LIF experiment is performed using solutions of Rhodamine B and 10 μm hollow glass spheres. A Nd:YAG laser emits pulses of 532 nm light which is shaped by light sheet optics before entering the test tank. The laser light excites the Rhodamine B which fluoresces yellow, whereas the hollow glass spheres scatter the light to appear green in the image frame. Imaging is performed at 75 fps using a MotionBLITZ EoSens® mini high speed camera system. The radial Reynolds number in the experiment is approximately Rr = 12500
Special thanks to my colleague Shane Wimsey for his assistance in implementing the experiment.
References:
Einstein, H. A. and Li, H. (1951) 'Steady vortex flow in a real fluid', Proc. Heat Transfer and Fluid Mechanics Institute, Stanford University, pp. 33-43.
Anwar, H. (1969) 'Turbulent flow in a vortex', Journal of Hydraulic Research, 7(1), pp. 1-29.
Authors: Sean Mulligan, John Casserly & Dr.Richard Sherlock
PhD Project Title - Experimental and Numerical Analysis of Three-Dimensional Free-Surface Turbulent Vortex Flows with Strong Circulation
Institute of Technology, Sligo
School of Engineering and Design
Centre for Environmental Research Innovation and Sustainability (CERIS)
For more details on experiment contact:
[email protected] or
[email protected]
Here we investigate the turbulent flow field of a weak vortex structure as it forms over a horizontal intake. When the critical submergence is reached, a full air core extends to the intake resulting in a relatively steady circulatory flow field. The tangential velocity varies inversely with the radius from the intake thus forming a highly turbulent vortex core region dominated by the effects of eddy viscosity (Einstein and Li, 1951; Anwar 1969).
The planar LIF experiment is performed using solutions of Rhodamine B and 10 μm hollow glass spheres. A Nd:YAG laser emits pulses of 532 nm light which is shaped by light sheet optics before entering the test tank. The laser light excites the Rhodamine B which fluoresces yellow, whereas the hollow glass spheres scatter the light to appear green in the image frame. Imaging is performed at 75 fps using a MotionBLITZ EoSens® mini high speed camera system. The radial Reynolds number in the experiment is approximately Rr = 12500
Special thanks to my colleague Shane Wimsey for his assistance in implementing the experiment.
References:
Einstein, H. A. and Li, H. (1951) 'Steady vortex flow in a real fluid', Proc. Heat Transfer and Fluid Mechanics Institute, Stanford University, pp. 33-43.
Anwar, H. (1969) 'Turbulent flow in a vortex', Journal of Hydraulic Research, 7(1), pp. 1-29.
Laser Induced Fluorescence of Iodine for CHEM 4511W - Advanced Physical Chemistry Lab at the University of Minnesota Twin Cities
Music:
Punchinello, Written an...
Laser Induced Fluorescence of Iodine for CHEM 4511W - Advanced Physical Chemistry Lab at the University of Minnesota Twin Cities
Music:
Punchinello, Written and performed by Ken Leopold
https://www.youtube.com/watch?v=inSSALPSru0
Laser Induced Fluorescence of Iodine for CHEM 4511W - Advanced Physical Chemistry Lab at the University of Minnesota Twin Cities
Music:
Punchinello, Written and performed by Ken Leopold
https://www.youtube.com/watch?v=inSSALPSru0
eCHEM 1A: Online General Chemistry
College of Chemistry, University of California, Berkeley
http://chemistry.berkeley.edu/echem1a
Curriculum and ChemQuizzes developed by Dr. Mark Kubinec and Professor Alexander Pines
Chemical Demonstrations by Lonnie Martin
Video Production by Jon Schainker and Scott Vento
Developed with the support of The Camille & Henry Dreyfus Foundation
In the experiment we 3 types of lasers: red 650 nm, green 532 nm, blue 450 nm.
Here we used various concentrations of chlorophyll and fluorescein and olive oil as fluorescence liquids. As a bonus we used glow sand with fluorescence and phosphorescence.
Prepared test tubes.
Low concentration chlorophyll
Medium concentration chlorophyll
High concentration chlorophyll
Olive oil
Fluorescent Bright Glow-in-the-Dark Sand Particles
Low concentration fluorescein liquid
Medium concentration fluorescein liquid
High concentration fluorescein liquid
If you have any more questions please contact : Dr. Juraj Kajan, [email protected]
Learn more about Endurance lasers
https://EnduranceLasers.com
https://Endurance-Lasers.com
Do you know the secret behind efficient temperature mapping of flows using Laser induced Fluorescence (LIF)?
It’s all about attention to detail!
⭐ LaVision offers a 2-color ratiometric LIF to measure temperatures accurately, regardless of tracer density variations or laser intensity fluctuations.
⭐ The anisole seeding generator, developed with the expertise of Bronkhorst Deutschland Nord GmbH, provides precise and dynamic control of the tracer distribution in the thermal jet.
⭐ The used Anisole tracer generates higher LIF signal at much lower seeding density compared to traditional acetone tracers.
⭐ The DaVis LIF software package performs the multi-step processing sequence including background and white field correction, with a single click!
European experts within the inSPECtor project have developed a modular system integrating sensors for reflectance and Laser induced Fluorescence (LiF) measurement with associated data processing routines for drill core logging and detection of Rare Earth Elements (REEs).This technology allows for much faster analyses for raw materials in an environmentally friendly way and at decreases costs, contributing to a green energy production and a circular economy - for a sustainable future and a responsible and efficient resource use.
Funding Agency: EIT Raw Materials
Project partners: TU Berkgakademie Freiberg, Freiberg Instruments GmbH, SPECIM- Spectral Imaging Ltd. ,Geological Survey of Finland (GTK), HZDR/HIF
Prof. Lotfia M. EL Nadi
Physics Department, Faculty of Science, Cairo University, GIZA, EGYPT.
NILES, CA-SAS for High Density Lasers, Cairo University, GIZA, EGYPT.
E-mail: [email protected]
Laser-Induced Fluorescence (LIF) is an optical spectroscopic technique where a sample is excited with a laser, and the fluorescence emitted by the sample is subsequently captured by a photodetector. LIF can be understood as a class of fluorescence spectroscopy where the usual lamp excitation is replaced by a laser source. Whilst lasers are now routinely used as excitation sources in photoluminescence spectrometers, LIF was not originally developed for a commercial instrument but as a standalone laser spectroscopy technique. LIF spectroscopy was used for the detection of atoms and molecules in the gas phase. Laser Induced Fluorescence offers interesting advantages over absorption spectroscopy. In addition, polarization-dependent measurements are easy to implement. One of the first applications of LIF spectroscopy was measuring the temperature of gas-phase samples, and today it is widely used for the analysis of flames. The technique soon moved beyond gas samples and into the liquid phase, as it became a detection technique in liquid chromatography and capillary electrophoresis (CE-LIF). Nowadays, LIF detection can be found in many contexts, from commercial analytical instruments to advanced microscopy experiments, and it is routinely used in biological and environmental research as well as fundamental spectroscopy studies
Keywords: Laser Induced Fluorescence; Photoluminescence; Photodetector; Absorption spectroscopy; Spectrometer; Time-resolved LIF
Ever wonder what makes your t-shirt glow under a black light? Or why the ink of a highlighter seems un-naturally bright? Dr. Brian Wagner, professor of chemistry at the University of Prince Edward Island, explains the science behind fluorescence, and how we see it around us every day.
Learn more about Dr. Wagner and his research at https://islandscholar.ca/people/bwagner
Authors: Sean Mulligan, John Casserly & Dr.Richard Sherlock
PhD Project Title - Experimental and Numerical Analysis of Three-Dimensional Free-Surface Turbulent Vortex Flows with Strong Circulation
Institute of Technology, Sligo
School of Engineering and Design
Centre for Environmental Research Innovation and Sustainability (CERIS)
For more details on experiment contact:
[email protected] or
[email protected]
Here we investigate the turbulent flow field of a weak vortex structure as it forms over a horizontal intake. When the critical submergence is reached, a full air core extends to the intake resulting in a relatively steady circulatory flow field. The tangential velocity varies inversely with the radius from the intake thus forming a highly turbulent vortex core region dominated by the effects of eddy viscosity (Einstein and Li, 1951; Anwar 1969).
The planar LIF experiment is performed using solutions of Rhodamine B and 10 μm hollow glass spheres. A Nd:YAG laser emits pulses of 532 nm light which is shaped by light sheet optics before entering the test tank. The laser light excites the Rhodamine B which fluoresces yellow, whereas the hollow glass spheres scatter the light to appear green in the image frame. Imaging is performed at 75 fps using a MotionBLITZ EoSens® mini high speed camera system. The radial Reynolds number in the experiment is approximately Rr = 12500
Special thanks to my colleague Shane Wimsey for his assistance in implementing the experiment.
References:
Einstein, H. A. and Li, H. (1951) 'Steady vortex flow in a real fluid', Proc. Heat Transfer and Fluid Mechanics Institute, Stanford University, pp. 33-43.
Anwar, H. (1969) 'Turbulent flow in a vortex', Journal of Hydraulic Research, 7(1), pp. 1-29.
Laser Induced Fluorescence of Iodine for CHEM 4511W - Advanced Physical Chemistry Lab at the University of Minnesota Twin Cities
Music:
Punchinello, Written and performed by Ken Leopold
https://www.youtube.com/watch?v=inSSALPSru0
Laser-induced fluorescence or LED-induced fluorescence (LIF) is a spectroscopic method used for studying structure of molecules, detection of selective species and flow visualization and measurements.
The species to be examined is excited with a laser. The wavelength is often selected to be the one at which the species has its largest cross section. The excited species will after some time, usually in the order of few nanoseconds to microseconds, de-excite and emit light at a wavelength longer than the excitation wavelength. This fluorescent light is typically recorded with a photomultiplier tube (PMT) or Filtered Photodiodes.
Two different kinds of spectra exist, disperse spectra and excitation spectra.
The disperse spectra are performed with a fixed lasing wavelength, as above and the fluorescence spectrum is analyzed. Excitation scans on the other hand collect fluorescent light at a fixed emission wavelength or range of wavelengths. Instead the lasing wavelength is changed.
Using just a single femtosecond laser pulse, fsLS-CUP enables simultaneous, wide-field, real-time imaging of laser-induced fluorescence (LIF) from PAHs and laser-induced heating (LIH) from soot ...
Notably, laser-induced fluorescence technology is the most widely used non-invasive bioaerosol detection method with fast resolution. It involves the use of laser to excite fluorescent substances such ...
In this method, a continuous microwave field is used to manipulate the spin states of the NV centers while they are illuminated by a laser. The intensity of this laser-induced fluorescence changes depending on the external magnetic field.
In addition, Spirit will be equipped with additional instruments such as a Decay spectrometer Laser Induced (LIBS), A fluorescence spectrometer X-ray (XRF), A microscopic imaging system and a soil ...
These cutting-edge analyzers utilize state-of-the-art technology, including X-ray fluorescence (XRF) and laser-induced breakdown spectroscopy (LIBS), to identify the composition of various materials rapidly and accurately within seconds.
In recent years, laser-induced fluorescence detectors produced by using laser light as the light source of fluorescence detectors have greatly enhanced the signal-to-noise ratio of fluorescence ...
Estlack and colleagues developed a microfluidic organic analyzer system (MOA) with an integrated programmable microwave array (PMA) alongside glass microchannels and a laser-induced fluorescence (LIF) detection system.
...Bicester, UK, 8 June 2023 ... ... ... ... ... Using laser induced fluorescence, the new particle detector can detect Active Fluorescent Units (AFU) and count viable microbes without need for culturing, staining or reagents ... ... .
...Bicester, UK, 10th May 2023 ... ... The certified ISO particle detector uses laser induced fluorescence to detect Active Fluorescent Units (AFU) and count viable microbes without need for culturing ... ... ... ... ... ... ... .
Observing the polycyclic aromatic hydrocarbons (PAHs) laser-induced fluorescence decay in real-time ...Mishra and colleagues conducted by exciting laser-induced fluorescence with a single 532-nm pulse.
...LIBS techniques, such as plasma reheating and laser induced fluorescence, with plasma re-excitation in much shorter time delays, facilitating convenient use of lasers from the same sources.".
Some of these clocks use lasers and special resonator cavities to measure time intervals ... The final atomic state is determined by measuring the fluorescence of the altered atoms induced by another laser beam.
These molecules are then subjected to chemical analysis using three different units, including the Laser-Induced Fluorescence (LIF) unit that searches for amino acids, the Mass Spectrometer (MS) unit ...
Maryville Daily Forum
27 Nov 2023
Maryville Daily Forum
27 Nov 2023