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1

Monte Carlo simulation of SiO2 nanoparticle-coated polymer optical fiber humidity sensor by ray tracing

Kovacevic Milan S., Milosevic Marko M., Kuzmanovic Ljubica, Djordjevich Alexandar

Optica Applicata

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2021

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Vol. 51, nr 2

281--288

EN

A fiber optic device sensitive to humidity is detailed and modelled by ray tracing based on Monte Carlo simulation. The device is intended primarily for monitoring humidity in the microenvironment of wounds without removing the wound dressing and thus disturbing the wound-healing process. To produce the sensor, cladding is removed from a segment of its polymer-fiber and mesoporous SiO2 nanoparticles are deposited in the exposed zone. This introduces an additional light-transmission loss. The extent of such loss is related to the relative humidity of the environment. Such a relationship, embodying the essence of the sensor’s modulation principle, is examined in this paper by ray tracing based on Monte Carlo simulation. The sensor is explained in detail and its performance is characterised.

2

Simulation of the light propagation in structured matrices with liquid crystal for optical sensor active medium designing

Wójcik Waldemar

Przegląd Elektrotechniczny

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2020

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R. 96, nr 10

98--101

EN

In our paper, the simulation of the ray propagation through the solid-state matrix-liquid crystal structure is described. The rays propagate at a considerable angle to the investigated structure surface. And as a result, it leads to a sharp decreasing of the efficiency coefficient of the structure and, as a consequence, a decreasing of the signal-to-noise ratio. By adjustment of the refraction coefficient and the cholesteric liquid crystal pitch can be possible to change the reflection coefficient, the bandwidth selectively reflection, thereby affecting the parameters of the primary convectors of optical sensors.

PL

W pracy opisano symulację rozchodzenia się promieni przez strukturę matryca półprzewodnikową – ciekły kryształ. Promienie te rozprzestrzeniają się pod znacznym kątem do powierzchni badanej struktury. W rezultacie prowadzi to do gwałtownego spadku współczynnika sprawności struktury, a w konsekwencji do zmniejszenia stosunku sygnału do szumu. Współczynnik załamania światła i skok cholesterycznego ciekłego kryształu, może zmieniać współczynnik odbicia, szerokość pasma selektywnie odbitego, wpływając tym samym na parametry pierwotnego przetwarzania czujników optycznych.

3

Theoretical analysis of optical radiation absorbed in a lighting device

Wotzka D.

Poznan University of Technology Academic Journals. Electrical Engineering

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2017

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No. 92

205--213

EN

The article presents results of theoretical analysis performed using computer simulations based on the finite element method. The study involved analysis of propagation of optical radiation emitted by multiple LEDs installed in a lighting device. The study considered calculation and analysis of optical radiation propagation in the structure of a lamp and its surroundings. Based on the achieved results, the source and amount of losses of optical radiation that is absorbed by the lamps structure elements were determined.