Transient phenomena analysis using dynamic speckle patterns

Rabal, H.; Arizaga, Ricardo; Lucía, Nelly; Trivi, Marcelo; Romero, Gladis Graciela; Alanís, Elvio

doi:10.1117/1.600789

Cited by 38 publications

(12 citation statements)

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“…From its discovery, efforts have been determined in the exploration of the biospeckle as tool no destructive to evaluate the biological activity 23,34,35 . For being no destructive, it allows other studies to be made, concomitant in the same animal, which, of the experimental point of view, it is of great interest 33 .…”

Section: Discussionmentioning

confidence: 99%

The optical analysis of the abdominal wall using the biospeckle after implants of polypropylene mesh in rats

Nieri

Peres

Silva³

et al. 2009

Acta Cir. Bras.

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Purpose:To evaluate an experimental animal model to study the abdominal tissue activity considering its interaction with a polypropylene mesh, through the use of one of the optical phenomena of light Laser, the biospeckle. Methods: Fifty Wistar male rats were divided into four groups: Group 1: ten animals not submitted to surgery; Group 2: ten animals submitted to surgery without polypropylene mesh; Group 3: 20 animals submitted to surgery followed by the mesh placement; Group 4: (sham) with ten animals. None of the animals presented post surgical complications being submitted to the optical tests at the 20th postoperative day. Results: The analysis from the biospeckle tests, comparing the medians and standard deviations with T Student test, indicated that no significative difference was observed on the abdominal wall tissue activity in the four groups considered, with and without polypropylene mesh prosthesis implantation. Conclusion: The animal model is viable and the biospeckle open ways for a great number of experiments to be developed in evaluating tissue activity. Key words: Hernia, Abdominal. Polypropylenes. Lasers. Rats. RESUMO Objetivo:Avaliar o modelo experimental animal para o estudo da atividade tecidual da parede abdominal em sua interação com a prótese de polipropileno, através da utilização de um dos fenômenos ópticos da luz Laser, o biospeckle. Métodos: Foram utilizados 50 ratos Wistar machos, divididos em quatro grupos: Grupo 1 com 10 animais não operados e controles; Grupo 2 com 10 animais submetidos a cirurgia sem a colocação de prótese; Grupo 3 com 20 animais submetidos a cirurgia com colocação de prótese de polipropileno pré-peritonial; Grupo 4 (Sham) com 10 animais. Nenhum animal apresentou complicações pós-operatórias, sendo que no 20º PO foram submetidos ao ensaio óptico. Resultados: A comparação das médias e o desvio padrão das medidas da atividade tecidual da parede abdominal, com e sem implantação da prótese de polipropileno obtidas dos grupos de animais, pelo teste T de Student, não evidenciou diferença estatística significativa (p>0.05). Conclusão: A análise dos dados obtidos permitiu concluir que o modelo animal é viável e que o biospeckle abre caminhos para toda uma linha de experimentos a ser desenvolvida em avaliar atividade tecidual.

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Section: Discussionmentioning

confidence: 99%

The optical analysis of the abdominal wall using the biospeckle after implants of polypropylene mesh in rats

Nieri

Peres

Silva³

et al. 2009

Acta Cir. Bras.

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“…Besides, a similar phenomenon is also present in some industrial processes. Many efforts have been devoted to assign numbers to characterize the activity and correlate favorably with measurements of interest of experimenter [6][7][8][9]. These methods were applied to some extent to transient phenomena, i.e.…”

Section: Principle Of Dynamical Specklementioning

confidence: 99%

Improved inertia moment method of dynamic speckle analysis and its application

et al. 2009

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The aim of this paper is to present a novel inertia moment algorithm meanwhile use it to investigate the stress corrosion initiation stage of an aluminum alloy. The specimens are Al-2A12 alloy with thickness of 2mm which are immersed in the 3.5% sodium chloride solution. Three-point bending system is employed under displacement loading mode. The center displacement is 2mm, 2.5mm and 4mm, respectively. Meanwhile in order to observe the stress corrosion process, the solution temperature increases from 20.9 to 61.3 degrees centigrade. Average intensity method is recommended to contrast due to its validity for corrosion analysis. The results show at room temperature, the material is not prone to stress corrosion. General electrochemical corrosion is a major role and the process is comparatively moderate. Stress corrosion appears when the temperature has increased. It is a phenomenon of localized corrosion and exhibits asymmetric property. Accompanied with the corrosion process developed, this kind of asymmetric property is increasingly apparent from three-dimensional results.

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“…Several parameters have been proposed in the literature, [4][5][6] such as the full width at half maximum ͑FWHM͒, to characterize the autocorrelation function of the temporal history of a speckle pattern. In a recent work, 7 it was found that the width of the equivalent rectangle ͑WER͒ and X * log X parameters, which take into account several points of the autocorrelation function, give good results in the characterization of the speckle pattern that is produced in the drying of paint or fruit slices. It is also of great interest to be able to establish a relationship between the parameters measuring the speckle activity and the phenomenon giving rise to it.…”

Section: Introductionmentioning

confidence: 98%

Statistics of the dynamic speckle produced by a rotating diffuser and its application to the assessment of paint drying

2000

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We explore alternative ways to assign a measure to dynamic speckle patterns produced by different phenomena. Both the power spectrum and the autocorrelation of the intensity are considered. First, we describe an experimental study of the statistics of the Fresnel speckle patterns produced by illuminating a diffuser with laser light as a phenomenon where some control can be maintained on the dynamic variables. The diffuser rotates in a plane with constant angular speed. A correlation is established between some parameters of the autocorrelation or the power spectrum of the intensity fluctuations of the speckle patterns and the tangential speed corresponding to different distances from the rotation axis. A scale correction is suggested to estimate the number of points of the autocorrelation function that should be included in the calculations before speckle crosstalk starts. The defined parameters are then applied to characterize the activity of the dynamical speckle produced in the drying of paint. This is considered as a starting point for the understanding and assessment of more complex situations including biological activity. © 2000 Society of Photo-Optical Instrumentation Engineers. [S0091-3286(00)01006-0] Subject terms: dynamic speckle; autocorrelation function; drying of paint.Paper 990004

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Transient phenomena analysis using dynamic speckle patterns

Cited by 38 publications

References 0 publications

The optical analysis of the abdominal wall using the biospeckle after implants of polypropylene mesh in rats

The optical analysis of the abdominal wall using the biospeckle after implants of polypropylene mesh in rats

Improved inertia moment method of dynamic speckle analysis and its application

Statistics of the dynamic speckle produced by a rotating diffuser and its application to the assessment of paint drying

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