Numerična analiza meritev difuzne refleksije z uporabo integracijske krogle z notranjim izvorom svetlobe
magistrsko delo
Abstract
Meritve spektrov difuzne reflektivnosti z uporabo integracijske krogle so pogosto uporabljen eksperimentalni pristop za karakterizacijo optično sipajočih snovi in struktur, na primer bioloških tkiv in organov. Analiza tako dobljenih spektrov praviloma temelji na prilagajanju analitičnih ali numeričnih napovedi v definicijski geometriji, kjer vzorec obsevamo z ozkim svetlobnim snopom in zajamemo povratno sipano svetlobo iz dovolj velike okolice. A komercialni instrumenti pogosto delujejo obratno: Vzorec obsevajo izotropno in zajamejo svetlobo, ki izhaja iz sredine obsevane ploskve v razmeroma majhen prostorski kot. Smiselnost take meritve temelji na veljavnosti predpostavke o simetriji na obrat časa.
V okviru magistrske naloge preverimo, ali pride do kršitve te predpostavke, analiziramo nastalo napako in preverimo možnost za njeno odpravo pri analizi opisanih meritev. To dosežemo z uporabo natančne numerične simulacije razmer v eksperimentu, ki temelji na metodi Monte Carlo.
Keywords
difuzno refleksijska spektroskopija;transport svetlobe;integracijska krogla;človeška koža;beli standard;
Data
| Language: | Slovenian |
|---|---|
| Year of publishing: | 2021 |
| Typology: | 2.09 - Master's Thesis |
| Organization: | UL FMF - Faculty of Mathematics and Physics |
| Publisher: | [T. Žel] |
| UDC: | 543.424.4:616-073 |
| COBISS: |
69086467
|
| Views: | 985 |
| Downloads: | 118 |
| Average score: | 0 (0 votes) |
| Metadata: |
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Other data
| Secondary language: | English |
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| Secondary title: | Numerical analysis of diffuse reflectance measurements using an integrating sphere with an internal light source |
| Secondary abstract: | Measurements of diffuse reflectance spectra using an integrating sphere are commonly used to characterize optically scattering materials and structures, such as biological tissues and organs. The analysis of the thus obtained spectra is generally based on the adjustment of analytical or numerical predictions in definition geometry, in which the sample is irradiated with a narrow light beam and the diffusely reflected light is captured from a large enough surrounding area. However, many commercial instruments work the other way around: The sample is isotropically irradiated and the light emanating from the center of the irradiated area into a relatively small solid angle is analyzed. The validity of such measurement is based on the validity of the assumption of time reversal symmetry. In this master's thesis, we check whether this assumption is violated, analyze the error and check the possibility of its elimination when analyzing the described measurements. This is achieved by using a detailed numerical simulation, which is based on Monte Carlo method and with which we replicate the experimental procedure. |
| Secondary keywords: | diffuse reflectance spectroscopy;light transport;integrating sphere;human skin;white standard; |
| Type (COBISS): | Master's thesis/paper |
| Study programme: | 0 |
| Embargo end date (OpenAIRE): | 1970-01-01 |
| Thesis comment: | Univ. v Ljubljani, Fak. za matematiko in fiziko, Oddelek za fiziko |
| Pages: | 72 str. |
| ID: | 13099766 |
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