Verification of Malus's Law using a LCD monitor and Digital Photography

Vertchenko, Larissa; Vertchenko, Lev

doi:10.1590/1806-9126-rbef-2016-0029

Cited by 7 publications

(9 citation statements)

References 8 publications

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“…It has been measured in [34] that transmittance of a pair of real linear polarizers may have local maximum if the polarizer axes are mutually crossed, and around this point the transmittance is not fully symmetrical (the effect can be measured with sensitive measurement devices). Some smaller or bigger deviations of measured beam intensity from Malus's law are visible in experiments conducted in [35][36][37], too. The deviations depend on polarizer properties.…”

Section: Real Linear Polarizersmentioning

confidence: 89%

Extending the possibilities of the corpuscular theory of light by using the theory of stochastic processes

Procházka¹

2022

Preprint

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The well known experiment with thee linear polarizers clearly demonstrates interesting properties of light. The beam intensity of photon beam transmitted through one, two or three polarizers can be measured in dependence on the rotations of the polarizers. The experiment has attracted attention of many researchers because the measured intensities cannot be explained by photons being only absorbed by the polarizers; the polarizers must also change a property (called polarization) of the transmitted photons. However, contemporary theories of light have not allowed to determine the probability (density) functions characterizing the two effects. It has strongly limited understanding of the physical phenomenon. In this paper example data of beam intensities corresponding to 3 ideal identical linear polarizers are analyzed with the help of probabilistic model based on state-transition-change (STC) stochastic process. Using the process, it has been possible to determine numerical values of the probability (density) functions for the first time. Measured beam intensities corresponding to sequences of different polarization sensitive devices and other optical elements may be analyzed in similar way, too. The results provide new perspective on description of polarization of light and particle-matter interaction in general.

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Section: Real Linear Polarizersmentioning

confidence: 89%

Extending the possibilities of the corpuscular theory of light by using the theory of stochastic processes

Procházka¹

2022

Preprint

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“…In a different approach 2 , the ambient light sensor has been proposed to indirectly measure distances and to analyze coupled springs undergoing oscillatory motions. Here, we focus on an experiment using the ambient light sensor which involves the polarization of light [3][4][5][6][7][8][9] and, in particular, the Malus' law.…”

Section: Smartphone-based Experiments and Opticsmentioning

confidence: 99%

“…In this experiment, a source of polarized light, a polarizer, a photometer and a way to measure angles are needed. The source of linear polarized light is a flat computer monitor (or LCD TV screen) in plain white color [4][5][6] . The ambient light sensor of LG-G3 smartphone, located near the front camera ( Fig.…”

Section: The Experimentsmentioning

confidence: 99%

The Polarization of Light and Malus’ Law Using Smartphones

Martı́¹,

Stari²,

Cabeza³

et al. 2017

The Physics Teacher

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Originally an empirical law, nowadays Malus' law is seen as a key experiment to demonstrate the transverse nature of electromagnetic waves, as well as the intrinsic connection between optics and electromagnetism. In this work, a simple and inexpensive setup is proposed to quantitatively verify the nature of polarized light. A flat computer screen serves as a source of linear polarized light and a smartphone (possessing ambient light and orientation sensors) is used, thanks to its builtin sensors, to experiment with polarized light and verify the Malus' law.

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“…No entanto, os softwares disponíveis para realizar esta medição não permitem a exportação dos dados para análise e o smartphone não é um equipamento de baixo custo que seja normalmente encontrado em laboratórios e que, portanto, possa ser emprestado para alunos que não o possuam. Outro trabalho propõe o uso de uma câmera fotográfica digital (VERTCHENKO, 2016) que apresente a possibilidade de desabilitar o ajuste automático de exposição, uma funcionalidade que normalmente não está disponível nas câmeras mais baratas que são encontradas no mercado. Um outro trabalho (PEDROSO, 2016) ainda propõe a fabricação de um luxímetro usando um fotodiodo e um multímetro, mas tal estratégia necessita de uma calibração prévia pois a resposta do fotodiodo não é linear.…”

Section: = 0unclassified

Sistema sensor com câmera USB para uso em experimentos de polarização da luz

Fabris

Müller

Fabris

2017

Cad. bras. Ens. Fís.

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Este trabalho apresenta um sistema sensor para uso em laboratórios de ensino, composto por uma câmera USB e um software desenvolvido e disponibilizado pelos autores. O sistema sensor é adequado para o estudo de fenômenos associados à propriedade de polarização da luz, tendo sido testado em experimentos realizados para verificar a Lei de Malus e a eficiência espectral de polarizadores. São apresentados detalhes da montagem experimental, na qual a luz de uma lanterna de LED usada como fonte luminosa no visível é projetada numa tela branca após passar por dois polarizadores. A imagem projetada na tela é captada pela câmera e o software fornece a intensidade luminosa relativa da luz. Com o uso de dois polarizadores lineares tipo H rotatórios, ajustes lineares da Lei de Malus aos dados de intensidade da luz transmitida apresentaram coeficientes de correlação R maiores do que 0,9988. A eficiência dos polarizadores em diferentes regiões do espectro eletromagnético visível foi analisada com o auxílio de filtros de cor inseridos à montagem experimental. O sistema também foi empregado na avaliação da estabilidade temporal da intensidade do LED de luz branca.

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Verification of Malus's Law using a LCD monitor and Digital Photography

Cited by 7 publications

References 8 publications

Extending the possibilities of the corpuscular theory of light by using the theory of stochastic processes

Extending the possibilities of the corpuscular theory of light by using the theory of stochastic processes

The Polarization of Light and Malus’ Law Using Smartphones

Sistema sensor com câmera USB para uso em experimentos de polarização da luz

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