Acoustic tomography in relation to 2D ultrasonic velocity and hardness mappings

Li, Li; Wang, Lihai; Allison, R. Bruce

doi:10.1007/s00226-011-0426-y

Cited by 37 publications

(19 citation statements)

References 6 publications

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“…The main commercial devices consist of Picus Ò (Argus Electronic), ARBO-TOM Ò (Rinntech) and ArborSonic (Fakopp). These are the tomographs used in most published studies (Rust 2000;Gilbert and Smiley 2004;Rabe et al 2004;Rinn 2004;Divos and Divos 2005;Wang et al 2007b;Deflorio et al 2008;Bucur 2011;Li et al 2012). None of these studies has compared the different tomographic apparatus together on the same sample except Klug and Lewald-Brudi (2009), who provided qualitative comparisons between the commercial devices, mainly to the attention of professional end users.…”

Section: Main Features Of Acoustic and Ultrasonic Tomographymentioning

confidence: 95%

Literature review of acoustic and ultrasonic tomography in standing trees

Arciniegas

Prieto

Brancheriau

et al. 2014

Trees

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Key message High-resolution imaging is possible if high-frequency sensors are used together with a signalprocessing and inversion algorithm that is well suited to a low signal-to-noise ratio and the effect of wood anisotropy. Wood is a biological growth medium, and given that standing trees adapt themselves in their growth to environmental conditions, their material properties vary with age. These changes result in variations that are far more complex than anisotropy. Wood quality and intraspecific variability can thus be studied to gain an understanding of the development mechanisms of trees, and this can be useful for clonal selection and the management of tree communities. A number of techniques are available to determine wood properties in standing trees, but the signal-processing approaches currently used are not always robust and do not always provide the image resolution needed in the particular cases of acoustic or ultrasonic tomography. This review paper thus aims to present important aspects that should be taken into account when using tomography techniques and addresses a number of open problems. A brief review of current non-destructive wood imaging techniques is initially presented followed by a comparison of the protocols, methods and models used in acoustic and ultrasonic tomography. The devices cited were studied in terms of measurement systems and signal processing. The analysis aimed to highlight and analyze the advantages and disadvantages of each device and describe challenges and trends. The effect of various parameters is discussed: frequency, signal-to-noise ratio, number of sensors and inversion algorithm. General conclusions are then drawn in relation to future signal-processing work in the acoustic and ultrasonic tomography of standing trees. (Résumé d'auteur

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Section: Main Features Of Acoustic and Ultrasonic Tomographymentioning

confidence: 95%

Literature review of acoustic and ultrasonic tomography in standing trees

Arciniegas

Prieto

Brancheriau

et al. 2014

Trees

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“…In the past decades, acoustic tomography using TOF measurements has been continuously gaining interest in seismic imaging [6], medical ultrasound imaging [7][8][9][10][11], atmospheric imaging [17-19, 32, 34, 57, 58], ocean current monitoring [2][3][4] and many other areas [13,86]. Examples of the acoustic tomography applications and the corresponding operating frequency ranges are listed in Table 2-4.…”

Section: Acoustic Tomography Applicationsmentioning

confidence: 99%

Online Time-Resolved Reconstruction Method for Acoustic Tomography System

Bao

Jia

2020

IEEE Trans. Instrum. Meas.

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“…No entanto, alguns trabalhos [2][3][4][5][6][7] utilizaram o princípio da propagação das ondas de tensão para estimar as propriedades da madeira.…”

Section: Introductionunclassified

“…Alguns autores [2,6,[8][9][10][11]] utilizaram a técnica de ondas de tensão com o único objetivo de obter uma imagem tomográfica da madeira. No trabalho [12] os autores utilizaram o Tomógrafo Acústico para determinar o módulo de elasticidade normal às fibras.…”

Section: Introductionunclassified

Determinação do módulo de elasticidade da madeira em função da inclinação das fibras utilizando tomógrafo acústico

et al. 2018

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RESUMOOs objetivos deste trabalho são determinar, a partir de ensaios não destrutivos, o módulo de elasticidade em função da inclinação das fibras da madeira através de um tomógrafo acústico, comparar e discutir a aplicação de seis critérios de falha adaptados para ensaios não destrutivos e modificar as equações para determinar os critérios de falha mais adequados para o ensaio não destrutivo proposto. Para isto foram ensaiados 6 corpos de prova de 150x15x4 cm de 6 espécies de madeira. Utilizou-se um tomógrafo acústico com oito transdutores. Estes sensores são fixados e excitados mecanicamente com um martelo. Cada vez que um sensor é excitado os outros captam o tempo que a onda mecânica tardou em chegar, logo é determinada a velocidade e calculado o módulo de elasticidade. A inclinação das fibras é determinada a partir dos ângulos formados por cada transdutor em relação a direção destas. Os resultados experimentais foram comparados com seis teorias de critérios de ruptura mecânica. Conclui-se que é possível utilizar o tomógrafo acústico para determinar o mó-dulo de elasticidade inclinado ás fibras, com apenas um ensaio experimental. Todos os seis modelos matemá-ticos avaliados não apresentam significância estatística em seu formato original. Com as modificações feitas nos modelos os que apresentaram significância foram apenas os modelos: hiperbólica, Karlsen e Hankinson, portanto eles são os mais indicados para estimar os valores do módulo de elasticidade dinâmico em função da inclinação das fibras.Palavras-chave: madeira; módulo de elasticidade; ensaios não destrutivos; tomógrafo acústico. ABSTRACTThe objectives of this work are to determine, from non-destructive tests, the modulus of elasticity as a function of the inclination of the wood fibers through an acoustic tomograph, to compare and discuss the application of six fault criteria adapted for non destructive tests and to modify the formulas for to determine the most suitable failure criteria for the proposed non-destructive test. To determine the most suitable failure criteria for the proposed non-destructive test. For this, 6 specimens of 150x15x4 cm of 6 species of wood were tested. An acoustic tomograph with eight transducers was used. These sensors are fixed and mechanically excited with a hammer. Each time a sensor is excited the others capture the time the mechanical wave took to arrive, then the speed is determined and the modulus of elasticity is calculated. The inclination of the fibers is determined from the angles formed by each transducer in relation to the direction thereof. The experimental results were compared with six theories of mechanical rupture criteria. It is concluded that it is possible to use the acoustic tomograph to determine the modulus of elasticity inclined to the fibers, with only one experimental test. All six mathematical models evaluated do not present statistical significance in their original format. With the modifications made in the models those that presented significance were only the models:

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Acoustic tomography in relation to 2D ultrasonic velocity and hardness mappings

Cited by 37 publications

References 6 publications

Literature review of acoustic and ultrasonic tomography in standing trees

Literature review of acoustic and ultrasonic tomography in standing trees

Online Time-Resolved Reconstruction Method for Acoustic Tomography System

Determinação do módulo de elasticidade da madeira em função da inclinação das fibras utilizando tomógrafo acústico

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