Infrared Deflectometry for Slope Deformation Measurements

Toniuc, H.; Pierron, Fabrice

doi:10.1007/s11340-019-00480-9

Cited by 13 publications

(8 citation statements)

References 38 publications

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“…Another approach is the use of infrared instead of visible light for deflectometry, with heated grids as spatial carrier [47]. Since infrared light has a longer wavelength than visible light, it allows achieving specular reflection on specimens that do not have mirror-like but reasonably smooth surfaces with up to about 1.5 μm of RMS roughness, like perspex and metal plates.…”

Section: Limitations and Future Workmentioning

confidence: 99%

Full-Field Surface Pressure Reconstruction Using the Virtual Fields Method

2019

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This work presents a methodology for reconstructing full-field surface pressure information from deflectometry measurements on a thin plate using the Virtual Fields Method (VFM). Low-amplitude mean pressure distributions of the order of few O(100)Pa from an impinging air jet are investigated. These are commonly measured point-wise using arrays of pressure transducers, which require drilling holes into the specimen. In contrast, the approach presented here allows obtaining a large number of data points on the investigated specimen without impact on surface properties and flow. Deflectometry provides full-field deformation data on the specimen surface with remarkably high sensitivity. The VFM allows extracting information from the full-field data using the principle of virtual work. A finite element model is employed in combination with artificial grid deformation to assess the uncertainty of the pressure reconstructions. Both experimental and model data are presented and compared to show capabilities and restrictions of this method.

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Section: Limitations and Future Workmentioning

confidence: 99%

Full-Field Surface Pressure Reconstruction Using the Virtual Fields Method

2019

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“…While thermal imaging cameras are available, the pattern creation remains a challenge in IRDM: there exist no off-theshelf parts like monitors or projectors for LWIR similar to those operating with visible light. Starting from the initial experiments [394] to recent applications [66,395,396], one mostly uses static patterns. Harnessing dynamic thermal processes in order to generate patterns still remains a challenging engineering endeavor [61,62,397].…”

Section: Inspection With Infrared Lightmentioning

confidence: 99%

Deflectometry for specular surfaces: an overview

Burke¹,

Pak²,

Höfer³

et al. 2022

Preprint

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Deflectometry as a technical approach to assessing reflective surfaces has now existed for almost 40 years. Different aspects and variations of the method have been studied in multiple theses and research articles, and reviews are also becoming available for certain subtopics. Still a field of active development with many unsolved problems, deflectometry now encompasses a large variety of application domains, hardware setup types, and processing workflows designed for different purposes, and spans a range from qualitative defect inspection of large vehicles to precision measurements of microscopic optics. Over these years, many exciting developments have accumulated in the underlying theory, in the systems design, and in the implementation specifics. This diversity of topics is difficult to grasp for experts and nonexperts alike and may present an obstacle to a wider acceptance of deflectometry as a useful tool in other research fields and in the industry.This paper presents an attempt to summarize the status of deflectometry, and to map relations between its notable "spin-off" branches. The intention of the paper is to provide a common communication basis for practitioners and at the same time to offer a convenient entry point for those interested in learning and using the method. The list of references is extensive but definitely not exhaustive, introducing some prominent trends and established research groups in order to facilitate further selfdirected exploration by the reader.

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“…Note that the use of deflectometry requires a specimen surface that is flat and specularly reflective, which corresponds to a mirror-like surface in the visible spectrum. Recent works 29 , 30 show that the use of infrared light sources and high-speed infrared cameras may overcome such a limitation.…”

Section: Introductionmentioning

confidence: 99%

Comparison of three full-field optical measurement techniques applied to vibration analysis

O'Donoughue

Gautier

Meteyer

et al. 2023

Sci Rep

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Digital image correlation, deflectometry and digital holography are some of the full-field optical measurement techniques that have matured in recent years. Their use in vibroacoustic applications is gaining attention and there is a need for cataloging their performance in order to provide, to a broad community of users and potential future users, quantitative and qualitative evaluations of these three approaches. This paper presents an experimental comparison of the three optical methods in the context of vibration measurements, along with classical reference measurements provided by an accelerometer and a laser Doppler vibrometer. The study is carried out on two mechanical structures exhibiting various vibration responses when submitted to an impact.

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Infrared Deflectometry for Slope Deformation Measurements

Cited by 13 publications

References 38 publications

Full-Field Surface Pressure Reconstruction Using the Virtual Fields Method

Full-Field Surface Pressure Reconstruction Using the Virtual Fields Method

Deflectometry for specular surfaces: an overview

Comparison of three full-field optical measurement techniques applied to vibration analysis

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