Holograms
Mostrando 1-12 de 13 artigos, teses e dissertações.
-
1. Dynamic Digital Holography for recording and reconstruction of 3D images using optoelectronic devices
Abstract In this work, we present the optical recording and reconstruction of dynamic 3D digital holograms using optoelectronic devices. Digital Holography technique allows recording and reconstruction of three-dimensional images of real objects, since a hologram presents both the intensity and phase information about the object. The experimental implementat
J. Microw. Optoelectron. Electromagn. Appl.. Publicado em: 2017-09
-
2. La física en la extensión universitaria a través de la holografía como medio de educación social
With the emergence and development of the white-light holograms, new possibilities were created for its utilization as a social education medium due to the characteristic of producing a three-dimensional image which constitutes an optical duplicate of the object. The paper describes the merits and characteristics of the hologram as a means of social educatio
Rev. Bras. Ensino Fís.. Publicado em: 2014-03
-
3. Haciendo hologramas en la escuela y en la casa
The scientific community that deals with the problems related with the teaching-learning process of Physics has devoted many efforts in its perfectioning in the last years motivated, in the first instance, by renewal demands that the rapidly scientific-technological development currently requests in the teaching of science. In the last few years a rapid deve
Revista Brasileira de Ensino de Física. Publicado em: 2010-09
-
4. Holografía: ciencia, arte y tecnología
This article provides a historical review of the origins of holography, placing particular emphasis on the contributions made by Gabor, Denisyuk and Leith to the development of holographic techniques. First of all the physical basis of holography is discussed: interference and difraction, together with the processes involved in recording and reconstructing h
Revista Brasileira de Ensino de Física. Publicado em: 2009-04
-
5. El holograma y su utilización como un medio de enseñanza de la física en ingeniería
With the emergence and development of the white-light holograms, new possibilities were created for its utilization as a teaching tool due to the characteristic of producing a three-dimensional image which constitutes an optical duplicate of the object. In this work the distinctive aspects of the hologram are described and its utilization is analyzed in engi
Revista Brasileira de Ensino de Física. Publicado em: 2009-04
-
6. Elemento óptico difrativo de luz branca gerado por computador / White light computer-generated element
Holograms can be produced using traditional holography techniques or may be also generated by computer, which are known as CGHs(Computer-generated holograms). Most of these holograms operate using monochromatic light. On the other hand, holograms can also operate with white light. These white light holograms are used in several applications, such as security
Publicado em: 2007
-
7. Fixing of holograms in Lithium Niobate / Fixação de hologramas em Niobato de Litio
In this work important contributions to the field and to the self stabilized holographic record in litium niobate were achieved and to the dynamic formation and hologram evolution study during different fixing stages. Other important contributions in this work refer to more efficient technique development and/or simpler ones to hologram fixing. On terms of s
Publicado em: 2005
-
8. "Hologramas gerados por computador utilizados como sensores ópticos" / "Computer-generated holograms used as an optical sensor"
Dois tipos diferentes de hologramas (Fresnel e Fourier) foram gerados por computador. O holograma de Fresnel foi escolhido para fazer parte de um arranjo experimental que teve como objetivo estimar a rugosidade de amostras metálicas. Para isso, um novo método de aplicação de um correlator óptico foi desenvolvido. Hologramas de Fourier geralmente fazem p
Publicado em: 2005
-
9. "Influência dos materiais restauradores protéticos na transmissão da carga oclusal : método da interferometria holográfica" / Influence of prosthetic restorative materials at occlusal load transmission. Holographic Interferometry Method
Although researches assert that restoring dental material, due to their different mechanical properties, influences at load transmission to support tissues, it was not find any conclusive scientific evidence. Researches with finite element, implants and different prosthetic reconstruction material do not have an agreement in terms of results. So, considering
Publicado em: 2005
-
10. Ondas de carga em materiais fotorrefrativos
Investigamos um novo procedimento que permite o uso de hologramas em movimento com retroalimentação (fringe-locked running holograms) para a caracterização de materiais fotorrefrativos absorventes de um modo simples, confiavel e direto. Este procedimento consiste na medida de variáveis experimentais (eficiência de difração e velocidade de movimento d
Publicado em: 2003
-
11. Imagens por dupla difração com luz branca usando redes de difração e uma fenda
We perform ray tracing analysis on the imaging of white light objects by diffractive elements. Only the main direction of rays is considered within an approximation that do not consider the extension of the image point. We first make a brief report on the history and basic concepts of diffractive optical elements, then we make a complete study of inverted de
Publicado em: 2003
-
12. Controle de fase em experimentos de mistura de duas ondas com cristais fotorrefrativos
A new approach for the independent, direct measurement of the amplitude and phase between two interfering beams is reported. The technique is based on phase modulation and synchronous detection by using a novel harmonics processor and a two-phase lock-in amplifier. The two lock-in output signals can be used in a negative feedback loop to control the phase be
Publicado em: 1996