Sökning: "light propagation models"

Visar resultat 1 - 5 av 21 avhandlingar innehållade orden light propagation models.

1. 1. Light scattering and absorption in tissue - models and measurements

   Författare :Annika M K Enejder; Atomfysik; []
   Nyckelord :NATURVETENSKAP; NATURAL SCIENCES; Tissue optical properties; Light absorption; Fluorescence spectroscopy; Atomic and molecular physics; NIR spectroscopy; Fysicumarkivet A:1997:Enejder; Light scattering; Atom- och molekylärfysik;

   Sammanfattning : In this work a number of theoretical models, describing light propagation in matter, have been applied to and developed for the examination of tissue. The aim was to model the light scattering and absorption in tissue in order to improve the understanding of underlying mechanisms of laser-based diagnostics and treatment modalities utilised for cancer and cardiovascular diseases. LÄS MER

3. 2. Light Propagation and Gas Absorption Studies in Turbid Media Using Tunable Diode Llaser Techniques

   Författare :Liang Mei; Atomfysik; []
   Nyckelord :NATURVETENSKAP; NATURAL SCIENCES; gas in scattering media absorption spectroscopy; tunable diode laser absorption spectroscopy; frequency modulated light scattering interferometry; light propagation; Absorption spectroscopy; turbid media; diode laser; gas monitoring; porous media; ceramics; food packaging; Fysicumarkivet A:2014:Mei;

   Sammanfattning : Optical absorption spectroscopy is a widely used analytical tool for constituent analysis in many applications. According to the Beer-Lambert law, the transmitted light intensity through a homogeneous medium is an exponential function of the product of the concentration, the total pathlength, and the absorption cross-section of the absorbing substance. LÄS MER

4. 3. Electromagnetic Fields in Moving and Inhomogeneous Media

   Författare :Paul Piwnicki; KTH; []
   Nyckelord :Moving Media; Light; Genaral Relativity;

   Sammanfattning : The present thesis deals with electromagnetic effectscreated by the motion or inhomogeneity of a dielectricmedium.In the first paper the quantum R\"ontgen effect isdiscussed. Here a rotating Bose-Einstein condensate -- oranother kind of quantum fluid -- is placed in a chargedcapacitor. The medium's rotation creates a magnetic field. LÄS MER

5. 4. Optical Analysis of biological media - continuous wave diffuse spectroscopy

   Författare :Jan Sørensen Dam; Atomfysik; []
   Nyckelord :NATURVETENSKAP; NATURAL SCIENCES; spatially resolved diffuse reflectance; in vitro diffuse spectroscopy; continuous wave techniques; Nuclear physics; multivariate data analysis.; Kärnfysik; Fysik; Physics; Medicin människa och djur ; Medicine human and vertebrates ; Monte Carlo simulations; light propagation models; multiple scattering; Tissue optics; tissue optical properties; Fysicumarkivet A:2000:Sörensen Dam;

   Sammanfattning : The main topic of this thesis is real-time quantification of relevant chromophores and light scattering elements in biological media. The presented methods and instrumentation are based on continuous wave (steady-state) optical measurements of (a) spatially-resolved diffuse reflectance from bulk media and (b) combined spatially-resolved and goniometric measurements of re-emitted light from thin samples. LÄS MER

7. 5. Light Scattering in Fiber-based Materials : a foundation for characterization of structural properties

   Författare :Tomas Linder; Stefan Andersson-Engels; Luleå tekniska universitet; []
   Nyckelord :TEKNIK OCH TEKNOLOGIER; ENGINEERING AND TECHNOLOGY; Industriell elektronik; Industrial Electronics;

   Sammanfattning : Deeper knowledge of light propagation in fiber-based materials is fundamental in order to understand their optical appearance as well as for industrial applications. Light scattering measurements are appropriate in handling dynamic industrial environments and can provide information regarding structural properties. LÄS MER