Identifying subsurface detachment defects by acoustic tracing

Skłodowski, Radosław; Drdácký, Miloš; Skłodowski, Marek

doi:10.1016/j.ndteint.2013.02.002

Cited by 16 publications

(22 citation statements)

References 3 publications

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“…The shadow effects were quantified and shown in Figure 2b. The relationships between the numbers of iterations and the defined energy defined by Equation 3 The acoustic tracing measurements were applied to the façade of the building to verify the segmented results of using the proposed algorithms to analyze IRT [3]. The audio signals of the acoustic tracing will reach a maximum while a precursor hit the place in which can be identified as a defect, and an example is given in Figure 3.…”

Section: Materials and Processed Resultsmentioning

confidence: 99%

The Feasibility of Identifying Defects Illustrated on Building Facades by Applying Thermal Infrared Images with Shadow

Tsai

Huang

Tai

2019

The 15th International Workshop on Advanced Infrared Technology and Applications

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Infrared thermography (IRT) has been widely employed to identify the defects illustrated in building facades. However, the IRT covered with a shadow is hard to be applied to determine the defects shown in the IRT. The study proposed an approach based on the multiplicated model to describe quantitively the shadow effects, and the IRT can be segmented into few classes according to the surface temperature information recorded on the IRT by employing a thermal infrared camera. The segmented results were compared with the non-destructive method (acoustic tracing) to verify the correctness and robustness of the approach. From the processed results, the proposed approach did correctly identify the defects illustrated in building facades through the IRTs were covered with shadow.

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Section: Materials and Processed Resultsmentioning

confidence: 99%

The Feasibility of Identifying Defects Illustrated on Building Facades by Applying Thermal Infrared Images with Shadow

Tsai

Huang

Tai

2019

The 15th International Workshop on Advanced Infrared Technology and Applications

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“…The sound can be analyzed directly by the operator listening or it can be recorded and analyzed with electronic devices. Another technique consists in dragging a chain along the surface and listening to the emitted sound, or in the "natural percussion" method to analyze the sound generated by the rebound of a sphere dragged along the surface [63]. A semiautomatic variation is called AAT [64].…”

Section: Simple Acoustic Testsmentioning

confidence: 99%

“…All these methods could substitute infrared thermography on polish surface. In order to do automatic discrimination of sounds, some acoustic analyses on the audible spectrum have been presented in the work of Sklodowski et al [63]. They tested different tapping instruments, such as finger, rubber sphere a wire in a hard plastic coating.…”

Section: Simple Acoustic Testsmentioning

confidence: 99%

Non-Destructive Techniques Applied to Monumental Stone Conservation

Menéndez¹

2016

Non-Destructive Testing

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Non-destructive techniques have always been used in the study of built cultural heritage because of the high cultural value of the concerned objects and the need to preserve them as intact as possible. In this chapter, different non-destructive techniques applied to the conservation of historical building are presented. The selected techniques concern the measurement of some physical properties of the building materials measured at the surface: water absorption, permeability, water content, cohesion, hardness and so on; the actual conditions of the building: stress state, deformation, crack growth and so on; and in-depth physical properties: mechanical properties, inner structure of walls, damp location and salt content. Some of these techniques are used for inspection of the building at a given time, whereas others can be applied for long periods of time to investigate the evolution of the building or of one of its parts (e.g., crack propagation) with time. After presenting the physical background of each method, the main objective of this review is to focus on the applications, especially to discuss which information can be supplied and to present published results in each case. Some techniques are very simple and require very inexpensive equipment but others, which are mainly adaptations of field geophysical techniques, use more sophisticated technology and require post-acquisition treatments based on more complex physical principles. Finally, some examples of combinations of different techniques are presented because a unique method cannot provide all the information needed to understand the weathering processes taking place in a building. The final goal of the studies is to contribute to the preservation of the cultural heritage. The choice of the conservation strategies and methods should be based on a deep knowledge of the building, and nondestructive testing is usually the only way to get it.

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“…In these stands, patches of barren soil, directly exposed to the drying effect of the sun and wind, may be abundant. Under such conditions, the structure and composition of forest-floor vegetation are obviously altered: the soil becomes drier, and the ground surface may be covered by fallen trees and other organic material subject to slow decomposition ( Ulanova 2000 ; Bouget and Duelli 2004 ; Bouget 2005a , 2005b ; Skłodowski 2007a ). Such dramatic changes in the environmental conditions in turn alter invertebrate assemblages, including carabid beetles ( Bouget 2005c ).…”

Section: Introductionmentioning

confidence: 99%

“…However, an untouched area of about 445 ha (“Szast Protective Forest”) was left unmanaged. A research project on the tornado impact started in 2003 ( Skłodowski and Zdzioch 2005 ; Skłodowski 2007b , 2007c ; Skłodowski and Garbalińska 2007a , 2007b ) and continues to date. In the present paper, the following exploratory questions were put forward, using data on the first six post-tornado years: (1) How do carabid assemblages change during the first six years after the tornado-caused disturbance?…”

Section: Introductionmentioning

confidence: 99%

Ground beetle (Coleoptera, Carabidae) assemblages inhabiting Scots pine stands of Puszcza Piska Forest: six-year responses to a tornado impact

Skłodowski¹,

Garbalinska²

2011

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Ground beetle assemblages were studied during 2003-08 in the Pisz Forest by comparing stands disturbed by a tornado to undisturbed control stands. The following exploratory questions were put forward. (1) How do the carabid assemblages change during six years following the tornado impact? (2) Does the carabid assemblage recovery begin during the six first post-tornado years? To assess the state of carabid assemblages we used two indices: the MIB (Mean Individual Biomass) and the SPC (Sum of Progressive Characteristics). Carabid assemblages in the disturbed and in the control stands, as expressed by these two indices, were compared using the length of a regression distance (sample distance in a MIB:SPC coordinate system). A cluster analysis revealed that the assemblages of the disturbed and the control stands were different. The tornado-impacted stands produced lower carabid catch rates, but species richness was significantly higher there than in the control stands. They hosted lower proportions of individuals of European species, of large zoophages, and of forest and brachypterous species, than the control stands. The observed reduction in SPC and MIB, and an increase in the regression distances may indicate that the carabid assemblages had not started to recover from the tornado-caused disturbance. Carabid assemblages apparently responded to the tornado in two steps. Firstly, the first three years were characterized by moderate decreases of index values. Secondly, from the fourth to the sixth year after the tornado, many observed changes became magnified. We did not observe clear signals of the recovery of forest carabid assemblages during the six follow-up years.

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Identifying subsurface detachment defects by acoustic tracing

Cited by 16 publications

References 3 publications

The Feasibility of Identifying Defects Illustrated on Building Facades by Applying Thermal Infrared Images with Shadow

The Feasibility of Identifying Defects Illustrated on Building Facades by Applying Thermal Infrared Images with Shadow

Non-Destructive Techniques Applied to Monumental Stone Conservation

Ground beetle (Coleoptera, Carabidae) assemblages inhabiting Scots pine stands of Puszcza Piska Forest: six-year responses to a tornado impact

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