Simultaneous Measurement of Thickness and Elastic Properties of Thin Plastic Films by Means of Ultrasonic Guided Waves

Kažys, R.; Tumšys, Olgirdas

doi:10.3390/s21206779

Cited by 6 publications

(4 citation statements)

References 29 publications

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“…There are some tasks in which applications of a few different guided waves enable us to obtain more information about structures under a test. For example, the measurement of phase velocities of symmetrical S 0 and antisymmetrical A 0 guided wave modes allowed us to determine the thickness and Young's modulus of thin PVC films [21]. The main problem is how to excite such modes in thin films especially using air-coupled methods.…”

Section: Conclusion and Discussionmentioning

confidence: 99%

“…However, exploitation of the symmetric S 0 mode enables not only detection of various defects, but also evaluation of elastic properties of the item under a test [20]. For example, simultaneously excited S 0 and A 0 guided wave modes enabled the measurement of thickness and Young's modulus of thin PVC films [21]. For practical applications, it would be very attractive to use it for the same ultrasonic air-coupled transducer or array.…”

Section: Introductionmentioning

confidence: 99%

“…For practical applications, it would be very attractive to use it for the same ultrasonic air-coupled transducer or array. To our knowledge, a detailed analysis of the performance of such methods is still missing [21]. For this purpose, we propose instead a single ultrasonic transducer to use linear air-coupled arrays, which can be electronically readjusted to optimally excite and receive the required guided wave modes.…”

Section: Introductionmentioning

confidence: 99%

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Numerical Investigation of Excitation of Various Lamb Waves Modes in Thin Plastic Films

2022

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Ultrasonic-guided waves are widely used for the non-destructive testing and material characterization of plates and thin films. In the case of thin plastic polyvinyl chloride (PVC), films up to 3.2 MHz with only two Lamb wave modes, antisymmetrical A0 and symmetrical S0, may propagate. At frequencies lower that 240 kHz, the velocity of the A0 mode becomes slower than the ultrasonic velocity in air which makes excitation and reception of such mode complicated. For excitation of both modes, we propose instead a single air-coupled ultrasonic transducer to use linear air-coupled arrays, which can be electronically readjusted to optimally excite and receive the A0 and S0 guided wave modes. The objective of this article was the numerical investigation of feasibility to excite different types of ultrasonic-guided waves, such as S0 and A0 modes in thin plastic films with the same electronically readjusted linear phased array. Three-dimensional and two-dimensional simulations of A0 and S0 Lamb wave modes using a single ultrasonic transducer and a linear phased array were performed. The obtained results clearly demonstrate feasibility to excite efficiently different guided wave modes in thin plastic films with readjusted phased array.

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Section: Conclusion and Discussionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Numerical Investigation of Excitation of Various Lamb Waves Modes in Thin Plastic Films

2022

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“…However, more direct measurement methods are often required for high-precision or high-load systems [ 13 ]. Many film-thickness measurement methods are available, such as electrical methods [ 14 , 15 , 16 ], optical methods [ 17 , 18 , 19 , 20 ], and ultrasonic methods [ 21 , 22 , 23 ]. Among them, the eddy-current method [ 24 , 25 ] is one of the most applied methods in industrial settings given its good working reliability, high sensitivity, and strong anti-interference ability.…”

Section: Introductionmentioning

confidence: 99%

Film-Thickness Identification Method and Lubrication Characteristic Experiment of Full-Size Water-Lubricated Stern Bearing under Offset Load

Ouyang

Liu

et al. 2022

Sensors

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Water-lubricated stern bearing (WSB) is a vital part of the ship propulsion-shaft system, and it is of great significance to monitor and analyze its lubrication status through film thickness data to improve the equipment operational reliability. In this paper, a full-size, large length-to-diameter ratio WSB experiment is carried out, and multi-sectional journal displacement data are collected under offset load. Accordingly, a bearing film-thickness identification model is established, which can identify the dynamic film thickness data in the circumferential direction of bearing section by limited measurement points. On this basis, the film thickness distribution of the full bearing is obtained by combining finite element (FE) simulation and particle swarm optimization (PSO) algorithm. The effect of different speeds on the distributed lubrication characteristics of WSB under offset load was systematically analyzed based on film thickness data. Results show that the maximum identification error of the bearing film-thickness identification model is less than 7%. The bearing lubrication state changes dynamically as the speed increases, and the hydrodynamic lubrication effect in the middle of the bearing is enhanced. The area of each lubrication sub-region varies nonlinearly. Research results are instructive for further determine the service life of the shaft system.

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Comparative Analysis of Layer Thickness Measurement Methods for Photovoltaic Modules: A Comprehensive Study

Neumaier,

De Biasio,

Gassner

et al. 2024

Adv Energy and Sustain Res

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The increasing volume of end‐of‐life (EoL) photovoltaic (PV) modules poses a significant challenge, necessitating efficient and sustainable recycling processes. In the PVReValue project, it is aimed to develop a comprehensive methodology for the systematic separation and recycling of EoL PV modules. Central to this effort is the precise determination of layer thicknesses, critical for effective characterization, and separation of input material. In this study, a comparative analysis of various industrial‐applicable methods is conducted for measuring layer thicknesses in PV modules. Both destructive and nondestructive techniques are evaluated based on criteria such as time, cost, accuracy, and applicability. Methods such as optical coherence tomography (OCT), coaxial multicolor confocal measurement, and ultrasonic measurements are assessed alongside traditional approaches like calotte grinding and optical 3D microscopy. In these findings, it is indicated that while OCT and confocal measurement offer high accuracy and nondestructiveness, they are complex and costly. Conversely, calotte grinding, although less costly, provides only localized information and can be challenging for polymers. In this study, it is concluded with recommendations for the possible integration of these methods into an industrial recycling workflow, highlighting the potential for improving PV module recycling efficiency and sustainability.

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Simultaneous Measurement of Thickness and Elastic Properties of Thin Plastic Films by Means of Ultrasonic Guided Waves

Cited by 6 publications

References 29 publications

Numerical Investigation of Excitation of Various Lamb Waves Modes in Thin Plastic Films

Numerical Investigation of Excitation of Various Lamb Waves Modes in Thin Plastic Films

Film-Thickness Identification Method and Lubrication Characteristic Experiment of Full-Size Water-Lubricated Stern Bearing under Offset Load

Comparative Analysis of Layer Thickness Measurement Methods for Photovoltaic Modules: A Comprehensive Study

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