New approaches to applied spectroscopy
The goal of this project is to simultaneously acquire all fluorescence spectra for all excitation wavelengths (Excitation Emission Matrix) and all absorption and scattering coefficients in a homogenous volume by means of a new double spectrometer and a 2D imaging chip.
Portable Multi-Wavelength Fluorosensor Based on UV Light Emitting Diodes
The goal of this project is to construct a fiber fluorosensor controlled from a laptop. Fluorescence spectra are acquired with several excitation wavelength generated by an array of Ultra Violet Light Emitting Diodes. The system should be portable for field use and comparable inexpensive and robust in order to be attractive for use in developing countries.
Monte Carlo simulations of light in sinus cavities
A paper has been accepted for publication with the title "On the potential of human sinus cavity diagnostics using diode laser gas spectroscopy". Preliminary data has been obtained showing the possibility to study oxygen in the frontal and maxillary sinuses.
To the left the locations of the maxillary and frontal sinuses are indicated. To the right the simplified model is shown.
The next step to take this application forward is to understand the light propagation during illumination of the sinuses. Since light propagation in scattering material is a complex matter, a phantom representing a simplified model of the sinuses has been investigated. The phantom is based on plastics with similar properties as human tisssue representing the tissue infront of and behind the sinuses. Measurements have been done both on this simplified model and on healthy voluntaries. The purpose of the diploma project will be to model the measurement, compare with obtained data, and thus get a better understanding of the possibilities and limitations of the new application. This will be done by simulate the light propagation for this application using Monto Carlo simulations. Futher on, depending on the result from the simulations, new experiments will be carried out.
Elias Kristensson & Lisa Simonsson
A GASMAS setup at Escuela Politecnica Nacional in Quito, Ecuador
A GASMAS and a Rubidium setup have been donated from the International Science Program, Uppsala, in collaboration with the Atomic Physics Division at Lund Institute of Technology. The goal of the project is to mount the equipment and transfer knowledge and ideas.
Märta Cassel-Engquist & Christoffer Björkwall
The Potential of Remote LIBS and Raman Spectroscopy for LIDAR Diagnostics and Treatment of Solid Materials
The Lidar technique is used for elemental analysis by focusing a pulsed laser beam onto metal plates, stones, minerals and crystals at 60 m distance. A glowing plasma is induced on the target surfaces, emitting both continuum light and discrete emission lines. The method is called R-LIBS (Remote Laser-Induced Breakdown Spectroscopy) and is being developed for surface characterization, remote laser cleaning, etc.
Determination of Optical Path Lengths in Scattering Media by Intensity Modulated Light in Connection with Gas in Scattering Media Absorption Spectroscopy
Controlling Diode Lasers with Applications to GASMAS
Technology Adaptations for Improved Multi-Spectral LIDAR Measurements
Development of a laser spectroscopic technique for gas in scattering media