A portable fiber laser thermography system with beam homogenizing for CFRP inspection

Wang, Rongbang; Pei, Cuixiang; Xia, Ruicong; Wang, Qiang; Chen, Zhenmao

doi:10.1016/j.ndteint.2021.102550

Cited by 12 publications

(4 citation statements)

References 14 publications

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“…The temperature sensitivity of the IR camera is 1 10 -4 degree and the sampling rate is 60 Hz. The laser shaper consists of a diffractive optical element with 15 by 15 spots array and a plano-concave lens, which can convert a single laser beam into a homogeneous laser beam of adjustable size [12] .…”

Section: Experiments 31 Experimental System and Specimensmentioning

confidence: 99%

Non-destructive testing of debonding defects in thermal barrier coating system using laser infrared thermography

Liu

Chen

Wang

et al. 2023

International Conference on Optical and Photonic Engineering (icOPEN 2022)

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Thermal barrier coating (TBC) system is indispensable for the heavy duty gas turbines or the aero-engine blades working at high temperature. Since the interface crack is one of the crucial issues affecting the integrity of the TBC, it is necessary to inspect the debonding defects in TBC by using a non-destructive testing (NDT) technique. Laser infrared thermography (LIRT) is a high efficiency NDT tool for thin-wall structures such like the TBC, and the LIRT using a homogeneous laser beam is especially suitable for detection of the debonding defects. In this paper, the feasibility of the homogeneous LIRT is verified for NDT of the debonding detection at first through finite element numerical simulation. Second, an experimental system using the diffractive optical element and a plano-concave lens is setup to conduct LIRT measurement with a wide homogeneous square laser spot. By using TBC specimen with debonding defects fabricated using the salt dissolving method, the pulsed LIRT and lock-In LIRT are conducted to detect the artificial debonding defects in TBC test-pieces. It is proved that the pulsed LIRT is of higher efficiency and the measured thermal image can be improved through denoising processing by using algorithm such as TSR, PCA etc. It is also found that the TSR image processing method costs less and can give results of higher contrast. The experimental results show that the debonding defects of diameter larger than 3 mm can be efficiently and accurately detected with the LIRT technique.

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Section: Experiments 31 Experimental System and Specimensmentioning

confidence: 99%

Non-destructive testing of debonding defects in thermal barrier coating system using laser infrared thermography

Liu

Chen

Wang

et al. 2023

International Conference on Optical and Photonic Engineering (icOPEN 2022)

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“…A homogenous LIT experimental system was proposed and applied to inspect delamination defect in layered structures [8,9] . As shown in Fig.…”

Section: Inspection System Of the Homogenous Litmentioning

confidence: 99%

“…Recently, laser infrared thermography (LIT) with homogenous heat energy in a large region is proposed and validated by authors for inspection of delamination in layered structures. An inspection system is also developed based on the homogenous LIT technique for the in-situ inspection of the multi-layered first wall panels in the vacuum vessel (VV) of a Tokamak device [7][8][9] . Moreover, we have developed a laser array spots thermography (LAST) technique for the efficient inspection and evaluation of the surface cracks [10][11][12][13][14][15][16] .…”

Section: Introductionmentioning

confidence: 99%

Studies on the infrared thermography technique for quantitative nondestructive evaluation of surface crack and delamination of multilayer structures

Yang

Liu

et al. 2023

International Conference on Optical and Photonic Engineering (icOPEN 2022)

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In this paper, some researches on the laser infrared thermography (LIT) and the eddy current infrared thermography (ECIT) for quantitative nondestructive testing and evaluation of surface cracks and delamination of multilayer structures are introduced. At first, a laser array spots thermography (LAST) method for inspection of surface cracks in metallic structures is presented. LAST related measurement and image processing methods for inspection and quantitative evaluation of crack profiles are introduced in detail. Second, LIT technique and numerical analysis methods for detection and sizing of interface delamination of multilayer structures are introduced aiming at application to the in-vessel structures of Tokamak fusion reactors, such as the first wall panels of blanket modules. At last, some studies on the quantitative nondestructive evaluation of delamination of thermal barrier coating system of gas turbine blades with ECIT are given. The numerical methods for forward analysis of heat generation and transfer process of infrared thermography, and for inverse analysis of defect size with infrared thermography signals are emphasized in this paper, in addition with experimental validations of both the numerical methods and the new inspection techniques.

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“…Several reports have described laser sources capable of producing high homogeneity flat top beam outputs. For instance, a CO 2 laser heating source has been built in the HEMEL laboratory, which can realise high homogeneity flat top beam output 22 – 24 . Notably, the wavelength of CO 2 laser primarily falls around 10 μm.…”

Section: Introductionmentioning

confidence: 99%

Experimental system and method of aerobic thermal environment simulation based on laser heating

Wang,

Li,

et al. 2024

Sci Rep

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Considering the superior luminous intensity characteristics of lasers, a thermal simulation platform employing laser-induced heating in an aerobic environment was developed. Achieving a uniformly distributed flat-topped square laser beam output was facilitated through optical fibre bundling techniques, while precise control over laser power output was attained through current modulation. Utilising the aforementioned system, thermal shock simulation experiments were conducted in an aerobic environment, subjecting two types of high-temperature-resistant composites, namely C/C and C/SiC, to temperatures up to 1800 °C. These composites were lightweight, heat-resistant materials designed for hypersonic vehicle applications. The results show that the system and method can be used to simulate high temperatures, rapid temperature increases, and thermal shocks on C/C composite materials, with minimal variation in the coupling coefficient under aerobic conditions. The system and method can also provide key technology support for thermal-force-oxygen coupling testing of high temperature resistant materials.

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A portable fiber laser thermography system with beam homogenizing for CFRP inspection

Cited by 12 publications

References 14 publications

Non-destructive testing of debonding defects in thermal barrier coating system using laser infrared thermography

Non-destructive testing of debonding defects in thermal barrier coating system using laser infrared thermography

Studies on the infrared thermography technique for quantitative nondestructive evaluation of surface crack and delamination of multilayer structures

Experimental system and method of aerobic thermal environment simulation based on laser heating

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