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Master's Dissertation
DOI
https://doi.org/10.11606/D.3.2004.tde-24102023-110239
Document
Author
Full name
Rodrigo de Souza Dias
E-mail
Institute/School/College
Knowledge Area
Date of Defense
Published
São Paulo, 2004
Supervisor
Committee
Gonçalves, Edison (President)
Marcicano, João Paulo Pereira
Muramatsu, Mikiya
Title in Portuguese
Desenvolvimento de método holográfico para inspeção de estruturas submersas.
Keywords in Portuguese
Estruturas subaquáticas
Holografia digital
Abstract in Portuguese
Um método holográfico para inspeção de defeitos superficiais em estruturas submersas é proposto com o objetivo de obter uma maior qualidade de imagem do que as obtidas pelos métodos convencionais de inspeção. Devido às deficiências das imagens produzidas pelos métodos que utilizam a óptica convencional, a introdução da holografia nos processos de inspeção submersa contribui para gerar uma imagem tridimensional com grande profundidade de campo e menores distorções, podendo-se, assim, avaliar com melhor precisão defeitos estruturais, tais como, corrosão localizada ou generalizada, trincas e porosidades superficiais, etc. Arranjos holográficos são utilizados para inspecionar um objeto com um defeito de geometria conhecida e avaliar a qualidade das imagens obtidas em condições submersas e não submersas. A análise e comparação da imagem holográfica com o defeito real comprovam a alta resolução e fidelidade do processo na avaliação das dimensões do defeito.
Title in English
Untitled in english
Keywords in English
Digital holography
Underwater structures
Abstract in English
A holographic method for inspection of defects in underwater structures is proposed with the objective of obtaining an image with more quality than the obtained by the conventional methods of inspection. Due to the deficiencies of the images produced by the methods that use the conventional optics, the introduction of the holography in underwater inspection processes contributes to generate a three-dimensional image with great field depth and smaller distortions, being able to evaluate with better precision structural defects, such as, located or widespread erosion, superficial trines, etc. Specific holographic arrangements are used to inspect an object with a defect of known geometry and to evaluate the quality of the obtained images in submerged and non submerged conditions. The analysis and comparison of the holographic image with the real defect prove the high resolution and fidelity of the process in the avaliation of the dimensions of the defect.
 
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Publishing Date
2023-10-24
 
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