Spectral Domain Optical Coherence Tomography for Non-Destructive Testing of Protection Coatings on Metal Substrates

Lenz, Marcel; Mazzon, Cristian; Dillmann, Christopher; Gerhardt, Nils C.; Welp, Hubert; Prange, Michael; Hofmann, Martin R.

doi:10.3390/app7040364

Cited by 18 publications

(9 citation statements)

References 31 publications

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“…The area of applications of OCT to heritage objects is still expanding. Over the last few years, reports on the novel use of OCT for rock vulnerability assessment [13] and protective coatings on metal [14] have emerged. Moreover, recently the combined use of OCT with some other techniques, to take advantage of the synergy effect, has been reported.…”

Section: An Overview Of Recent Applications Of Oct In Heritage Sciencementioning

confidence: 99%

OCT for Examination of Cultural Heritage Objects

Targowski¹,

Kowalska²,

Sylwestrzak³

et al. 2020

Optical Coherence Tomography and Its Non-Medical Applications

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Optical coherence tomography (OCT) was first time reported as a tool for examination of cultural heritage objects in 2004. It is mainly used for the examination of subsurface structure of easel paintings (such as varnishes and glazes) and has also been successfully used for inspection of other types of artworks, provided that they contain layers that are permeable to the probing light. This chapter discusses the last applications of OCT in this area with an emphasis on synergy with some other noninvasive techniques such as large-scale X-ray fluorescence (XRF) scanning and reflective Fourier transform infrared (FTIR) spectroscopy. After this part, there is a detailed description of the high-resolution OCT instrument developed by the authors specifically for the study of works of art. Next, two examples are given for the structural examination of works of art: in the former, the subsurface layers of an easel painting are presented, and in the latter, the painting on reverse of the glass is examined, when the inspection must be carried out through the glass. Finally, an application for the assessment of chemical varnish removal from an easel panel painting is discussed in details.

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Section: An Overview Of Recent Applications Of Oct In Heritage Sciencementioning

confidence: 99%

OCT for Examination of Cultural Heritage Objects

Targowski¹,

Kowalska²,

Sylwestrzak³

et al. 2020

Optical Coherence Tomography and Its Non-Medical Applications

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“…OCT, on the other hand, relies solely on optical interference to deliver high-resolution depth-resolved images [10]. Both techniques have found applications not only in biomedical research [11][12][13][14][15] but also in industrial processes, including non-destructive testing (NDT) [16][17][18].…”

Section: Introductionmentioning

confidence: 99%

Non-destructive quality testing with photoacoustic imaging and optical coherence tomography

Park,

Ahn,

Kim

2024

High-Power Laser Materials Processing: Applications, Diagnostics, and Systems XIII

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Non-destructive testing (NDT) is vital for product safety, quality, and compliance in various industries. It enables early flaw detection, cost-effective maintenance, and customer satisfaction. NDT encompasses technologies like vision testing, radiation testing, ultrasonic testing, and magnetic testing, which are tailored to specific requirements such as environment, size, and material of the specimen. We present concurrent photoacoustic imaging (PAI) and optical coherence tomography (OCT) for non-destructive inspection of printed circuit boards (PCBs). PCBs are integral to electronic products, contributing to their miniaturization and portability. Due to the small size of RLC components within PCBs, highresolution NDT methods are essential. PAI combines optical excitation and ultrasonic detection based on light absorption, while OCT is a purely optical imaging technique based on interference of backscattered signals. By combining PAI and OCT, we can simultaneously obtain complementary information on light absorption and scattering. However, the development of a dual-modality system combining PAI and OCT is challenging due to the opacity of conventional ultrasonic transducers. To overcome this challenge, we have developed an optically transparent ultrasound transducer for coaxial combination of PAI and OCT. Our approach successfully detects anomalies such as internal thin layer delamination and internal wire disconnection that are difficult to visually observe within PCBs, providing high-resolution PA and OCT images. In particular, unlike conventional pure optical imaging methods, PAI and OCT are depth-resolved 3D volumetric images so that internal defects can be investigated through comprehensive information in the depth direction of the sample. This dual-modality using PAI and OCT for NDT holds great promise for inspecting various specimens, including PCBs, and contributes to enhanced quality control and reliability.

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“…Using this technology, researchers have demonstrated various applications within spectroscopy and imaging, including OCT [16][17][18][19]. There have been few reports on OCT applied for inspection of coatings, primarily for art and cultural heritage preservation, as well as automotive and pharmaceutical coatings [8,[19][20][21][22][23][24][25][26][27][28]. Within automotive coatings, OCT operating around the 830 to 930 nm central wavelength range has been used to map the thickness of individual coating layers with an axial resolution of around 4-6 µm, but due to the short central wavelength, only the top clear coat layer is transparent, limiting the maximum penetration depth to about 100 µm [22][23][24][25].…”

Section: Introductionmentioning

confidence: 99%

Non-Destructive Subsurface Inspection of Marine and Protective Coatings Using Near- and Mid-Infrared Optical Coherence Tomography

et al. 2021

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Near- and mid-infrared optical coherence tomography (OCT) is evaluated as a non-destructive and non-contact reflection imaging modality for inspection of industrial and marine coatings. Near-infrared OCT was used to obtain high-resolution images (~6/2 µm lateral/axial) of hidden subsurface cracks and defects in a resin base coating, which had been exposed to high pressure and high temperature to study coating degradation in hostile environments. Mid-infrared OCT was employed for high-resolution (~15/8.5 µm lateral/axial) subsurface inspection of highly scattering marine coatings, demonstrating monitoring of wet film thickness and particle dispersion during curing of a 210 µm layer of antifouling coating, and detection of substrate corrosion through 369 µm of high-gloss alkyd enamel. Combining high-resolution and fast, non-invasive scanning, OCT is therefore considered a promising tool for studying coating performance and for industrial inspection.

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Spectral Domain Optical Coherence Tomography for Non-Destructive Testing of Protection Coatings on Metal Substrates

Cited by 18 publications

References 31 publications

OCT for Examination of Cultural Heritage Objects

OCT for Examination of Cultural Heritage Objects

Non-destructive quality testing with photoacoustic imaging and optical coherence tomography

Non-Destructive Subsurface Inspection of Marine and Protective Coatings Using Near- and Mid-Infrared Optical Coherence Tomography

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