Pulsed Air-Flow Thermography for Natural Crack Detection and Evaluation

Lu, Xiaolong; Tian, Guohui; Wu, Jianbo; Gao, Bin; Tian, Peng

doi:10.1109/jsen.2020.2982556

Cited by 10 publications

(3 citation statements)

References 31 publications

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“…Visualising temperature distribution profiles (Thermometry) facilitates localisation of suspected near-surface features (Thermography) [53,54], but recovery of specific attributes defers to higher quality UST or localised GPR imaging. Active Thermography (ACT) heats surfaces using halogen lamps [55], air guns [56] or inductive-heating elements [57] to induce exaggerated thermal responses. Abandoned testing by [58] and remarks of [59] affirm that heating element operation for RTSSI would incur impractical cost and could debond masonry, explaining its literary absence.…”

Section: Thermographic Methodsmentioning

confidence: 99%

Developments in 3D Visualisation of the Rail Tunnel Subsurface for Inspection and Monitoring

2022

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Railway Tunnel SubSurface Inspection (RTSSI) is essential for targeted structural maintenance. ‘Effective’ detection, localisation and characterisation of fully concealed features (i.e., assets, defects) is the primary challenge faced by RTSSI engineers, particularly in historic masonry tunnels. Clear conveyance and communication of gathered information to end-users poses the less frequently considered secondary challenge. The purpose of this review is to establish the current state of the art in RTSSI data acquisition and information conveyance schemes, in turn formalising exactly what constitutes an ‘effective’ RTSSI visualisation framework. From this knowledge gaps, trends in leading RTSSI research and opportunities for future development are explored. Literary analysis of over 300 resources (identified using the 360-degree search method) informs data acquisition system operation principles, common strengths and limitations, alongside leading studies and commercial tools. Similar rigor is adopted to appraise leading information conveyance schemes. This provides a comprehensive whilst critical review of present research and future development opportunities within the field. This review highlights common shortcomings shared by multiple methods for RTSSI, which are used to formulate robust criteria for a contextually ‘effective’ visualisation framework. Although no current process is deemed fully effective; a feasible hybridised framework capable of meeting all stipulated criteria is proposed based on identified future research avenues. Scope for novel analysis of helical point cloud subsurface datasets obtained by a new rotating ground penetrating radar antenna is of notable interest.

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Section: Thermographic Methodsmentioning

confidence: 99%

Developments in 3D Visualisation of the Rail Tunnel Subsurface for Inspection and Monitoring

2022

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“…For active thermography, the excitation sources usually can be divided into three categories: optical, mechanical and induction excitation [18]. Additionally, hot or cold gas/liquids as heat source has been revamped recently [19] [20]. Both flash and laser belong to optical excitation, while ultrasonic belongs to mechanical excitation [21], and Eddy current is a typical representative of induction excitation [22].…”

Section: A Methodologymentioning

confidence: 99%

A Miniaturized Active Thermography System to Inspect Composite Laminates

Liu

Zhao

et al. 2021

IEEE Trans. Ind. Inf.

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With the rapid increase of the integration and complexity of industrial components, the inaccessibility and inapplicability of existing Non-destructive testing devices have become a bottleneck for in-situ inspection of these objects. This paper introduces a miniaturised active thermography system featured with a small size, low resolution and low-cost thermal sensor, where two optional excitation sources including flash and laser are integrated. Dedicated data analysis approaches to evaluate defects are proposed considering the degraded signal quality. Three carbon fibre reinforced polymer laminates with a variety of defects are evaluated quantitatively and qualitatively using the proposed system by comparing with two existing nonminiaturised inspection systems. The results show that the proposed system can work effectively for the degradation assessment of composite laminates. Even with the technical limitations that affect the detectability, for instance, the low pixel resolution, this technique will play an important role to inspect components featured with geometrically intricate space.

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“…The airow thermography (AFT) method which combines the advantages of the air-ow heating and the thermography can realize non-contact detection of the micro-cracks. Lu Xiaolong et al proposed pulsed AFT for rail surface crack detection and evaluation [30]. The experimental results demonstrate that the AFT for rail surface cracks is effective at the low speed.…”

Section: Introductionmentioning

confidence: 99%

A Crack Detection Method for Aero-engine Blade Based on Air-Flow Thermography

Pan

Xiang²,

He³

et al. 2023

J Nondestruct Eval

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Aero-engine blade is one of the core components of aero-engine and its safe service is crucial to the normal operation of aero-engine. Thus, it is very important to localize and quantify cracks of aero-engine blades to prevent safety accidents. To guarantee the structural health of aero-engine blades, the air-ow thermography (AFT) method which has advantages of non-contact, high performance, and sensitivity, was proposed for detection of the blade cracks. Firstly, the theoretical thermal response model was established and the crack simulation models with different depths were constructed. Then a detection system was established to detect the arti cial cracks with different depths and orientations. Results showed that the proposed method can effectively quantify the cracks with different depths from 0.2 mm to1.0 mm and characterize the crack orientations. In addition, the natural crack on the blade was detected and the principal component analysis (PCA) method was used to enhance the crack contrast with the background.

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Pulsed Air-Flow Thermography for Natural Crack Detection and Evaluation

Cited by 10 publications

References 31 publications

Developments in 3D Visualisation of the Rail Tunnel Subsurface for Inspection and Monitoring

Developments in 3D Visualisation of the Rail Tunnel Subsurface for Inspection and Monitoring

A Miniaturized Active Thermography System to Inspect Composite Laminates

A Crack Detection Method for Aero-engine Blade Based on Air-Flow Thermography

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