Combined experimental and computational approach for defect detection in precious walls built in indoor environments

Perilli, Stefano; Сфарра, Стефано; Ambrosini, Dario; Paoletti, Domenica; Mai, Sabrina; Scozzafava, M.; Yao, Yuan

doi:10.1016/j.ijthermalsci.2018.02.026

Cited by 25 publications

(12 citation statements)

References 31 publications

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“…In infrared thermography, we focused on the temperature difference of the defective region and non-defective region, instead of the measured temperature values. The temperature values may change in different experiments due to the heating conditions and ambient temperature change [50,51]. However, our repeated experiments under the proper heating energy and data acquisition time setting showed that the difference between the defective area and the non-defective area are always detectable.…”

Section: Comparisonsmentioning

confidence: 82%

On the Use of Infrared Thermography and Acousto—Ultrasonics NDT Techniques for Ceramic-Coated Sandwich Structures

et al. 2019

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Ceramic-coated materials used in different engineering sectors are the focus of world-wide interest and have generated a need for inspection techniques that detect very small structural anomalies. Non-destructive testing is increasingly being used to evaluate coating thickness and to test for coating flaws. The main pros of non-destructive testing is that the tested object remains intact and available for continued use afterward. This paper reports on an integrated, non-destructive testing approach that combines infrared thermography and acousto-ultrasonics to evaluate advanced aerospace sandwich structure materials with the aim of exploring any potential for detecting defects of more than one type. Combined, these two techniques successfully detected fabrication defects, including inclusions and material loss.

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Section: Comparisonsmentioning

confidence: 82%

On the Use of Infrared Thermography and Acousto—Ultrasonics NDT Techniques for Ceramic-Coated Sandwich Structures

et al. 2019

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“…Given the model for the posterior according to Equation (2) and the parameters of the unary and pairwise potentials according to Equations (3) and (4), respectively, the goal of inference is to determine the label configuration for which P(y|x) becomes a maximum. For the optimization, we use an iterative message passing algorithm that can be applied to CRF with arbitrary formulations of interaction potentials: Loopy Belief Propagation (LBP).…”

Section: Contextual Classificationmentioning

confidence: 99%

“…Thermal infrared (TIR) images enable us to visualize different thermal faults such as air infiltrations or moisture areas and to detect damages to the building structure; for example, cracks, delamination, or loose tiling. Depending on the final aim of energy auditing, thermal data can be collected in an indoor environment [1,2] or by outdoor measurements including airborne platforms [3] and close-range techniques [4]. A broad review of various infrared thermography applications for building diagnostics is presented in Kylili et al [5].…”

Section: Introductionmentioning

confidence: 99%

Supervised Detection of Façade Openings in 3D Point Clouds with Thermal Attributes

2020

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Targeted energy management and control is becoming an increasing concern in the building sector. Automatic analyses of thermal data, which minimize the subjectivity of the assessment and allow for large-scale inspections, are therefore of high interest. In this study, we propose an approach for a supervised extraction of façade openings (windows and doors) from photogrammetric 3D point clouds attributed to RGB and thermal infrared (TIR) information. The novelty of the proposed approach is in the combination of thermal information with other available characteristics of data for a classification performed directly in 3D space. Images acquired in visible and thermal infrared spectra serve as input data for the camera pose estimation and the reconstruction of 3D scene geometry. To investigate the relevance of different information types to the classification performance, a Random Forest algorithm is applied to various sets of computed features. The best feature combination is then used as an input for a Conditional Random Field that enables us to incorporate contextual information and consider the interaction between the points. The evaluation executed on a per-point level shows that the fusion of all available information types together with context consideration allows us to extract objects with 90% completeness and 95% correctness. A respective assessment executed on a per-object level shows 97% completeness and 88% accuracy.

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“…As shown in recent literature, COMSOL Multiphysics® can be employed for studying several and different building related problems [19][20][21][22][23][24][25]; numerical result can be validated by comparison with various control systems such as thermo-flowmeters, thermocouples (as in the case under analysis), and thermographic techniques [26].…”

Section: Several Simulation Tools Are Available Both Open Source Andmentioning

confidence: 99%

Influence of insulation defects on the thermal performance of walls. An experimental and numerical investigation

Nardi¹,

Perilli²,

Rubeis³

et al. 2018

Preprint

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The addition of insulating layers on vertical walls of buildings is a common practice for providing a higher thermal insulation of the envelope. Workmanship defects, however, might influence the effectiveness of such insulation strategy. Damaged materials, incorrect installation, use of aged or weathered materials might alter the capability of reducing heat transfer through the envelope, whether vertical or sloped. In this work, drawbacks caused by the wrong installation of insulating material and by damaged material are assessed. A specimen wall was investigated by experimental and numerical approaches, the latter carried out by using COMSOL Multiphysics®. Results are compared and discussed.

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Combined experimental and computational approach for defect detection in precious walls built in indoor environments

Cited by 25 publications

References 31 publications

On the Use of Infrared Thermography and Acousto—Ultrasonics NDT Techniques for Ceramic-Coated Sandwich Structures

On the Use of Infrared Thermography and Acousto—Ultrasonics NDT Techniques for Ceramic-Coated Sandwich Structures

Supervised Detection of Façade Openings in 3D Point Clouds with Thermal Attributes

Influence of insulation defects on the thermal performance of walls. An experimental and numerical investigation

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