Noncontact Ultrasonic Nondestructive Techniques: State of the Art and Their Use in Civil Engineering

Kaczmarek, Mariusz; Piwakowski, Bogdan; Drelich, Radosław

doi:10.1061/(asce)is.1943-555x.0000312

Cited by 29 publications

(18 citation statements)

References 46 publications

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“…Non-contact acoustic excitation is one method of inducing resonance in an object by means of air coupling, which can be used to perform a frequency response analysis. Its effective use has been proven in modal experiments that require small but measurable displacements [19][20][21][22]. This method has specific advantages compared to impact and shaker excitations.…”

Section: Acoustic Excitationmentioning

confidence: 99%

Automated Non-contact Resonance Excitation Method to Assess Low Temperature Dynamic Modulus of Asphalt Concrete

Bekele

Rydén

Gudmarsson³

et al. 2019

J Nondestruct Eval

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This paper studies the applicability of an automated non-destructive testing method to monitor the stiffness of asphalt concrete at low temperatures. A loudspeaker is used as a source of non-contact excitation of the axially symmetric fundamental resonant frequencies of a disc-shaped asphalt concrete specimen positioned inside an environmental chamber. Measured resonant frequencies are used to calculate the dynamic moduli of the specimen at different temperatures. The repeatability of the method as well as the effect of loudspeaker height above the sample are studied. Results show that the main advantage of the non-contact excitation method, compared to manually applied impact hammer excitation, is that repeatable automated measurements can be performed while the specimen is placed inside an environmental temperature chamber. This methodology enables to study the effect of only low temperature conditioning on the dynamic modulus of asphalt concrete without interference from mechanical loading.

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Section: Acoustic Excitationmentioning

confidence: 99%

Automated Non-contact Resonance Excitation Method to Assess Low Temperature Dynamic Modulus of Asphalt Concrete

Bekele

Rydén

Gudmarsson³

et al. 2019

J Nondestruct Eval

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“…But as in the application of other NDTs in the field, some limitations of impact methods of resonance measurement have been encountered. These limitations are particularly related to coupling effects resulting lower signal to noise ratio as well as lack of automation [24]. These short comings have become motivations to develop non-contact methods of excitation for resonance testing.…”

Section: Automated Non-contact Resonance Testingmentioning

confidence: 99%

Effect of cyclic low temperature conditioning on stiffness modulus of asphalt concrete based on non-contact resonance testing method

Bekele

Rydén

Gudmarsson³

et al. 2019

Construction and Building Materials

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The stiffness modulus behaviors of three different asphalt concrete specimens that are subjected to cyclic cooling and heating are monitored. In an attempt to identify the sole effect of temperature cycles and to avoid any other biasing effects such as thermal contamination that can possibly corrupt measurements, resonance frequency measurements of the specimens are taken using an automated non-contact resonance method. The resonance frequency measurements are based on the fundamental axially symmetric mode of vibration. A hysteretic effect is observed on the measured resonance frequencies of the specimens with an application of cyclic cooling and heating. Lower stiffness moduli are obtained during the heating phase of a complete cooling and heating cycle. The stiffness moduli are calculated from measured resonance frequencies of the specimens in order to show their relative reductions due to the hysteretic effect. This finding is particularly important since it enables us to observe and understand the effect of the thermal history of asphalt concrete with regards to the reversibility behavior of its stiffness modulus. The damping of the specimens is also calculated from the measured resonance frequencies at the temperatures within the applied cyclic cooling and heating. Their observed behavior is also discussed with respect to a presence of potential micro damage.

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“…Air-coupled ultrasonic transducers, on the other hand, do not require special surface treatment and can serve an alternative solution to perform contactless measurements needed for ultrasonic wavefield imaging [15,16]. However, the spatial resolution of the acquired ultrasonic wavefield data can be undesirably low if the active sensing area of the air-coupled transducer is not small enough.…”

Section: Introductionmentioning

confidence: 99%

Contactless Ultrasonic Wavefield Imaging to Visualize Near-Surface Damage in Concrete Elements

Song

Popovics

2019

Applied Sciences

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We present work to detect and visualize near-surface damage in concrete using contactless ultrasonic wavefield imaging technology. A fully contactless ultrasonic scanning system that utilizes a micro-electro-mechanical systems (MEMS) ultrasonic microphone array is used to collect ultrasonic surface wave data from a concrete sample. The obtained wavefield data sets are processed with a frequency-wavenumber (f-k) domain wavefield filtering approach to extract non-propagating oscillatory fields set up by near-surface concrete cracking damage. The experimental results demonstrate that near-surface concrete damage can be detected and visualized using the proposed ultrasonic wavefield imaging approach.

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Noncontact Ultrasonic Nondestructive Techniques: State of the Art and Their Use in Civil Engineering

Abstract: Ultrasonic methods of testing of civil engineering materials in air where both transmission of waves into materials and reception of signals are contactless are reviewed. Short history, technical details and examples of applications of currently available methods are discussed.

Cited by 29 publications

References 46 publications

Automated Non-contact Resonance Excitation Method to Assess Low Temperature Dynamic Modulus of Asphalt Concrete

Automated Non-contact Resonance Excitation Method to Assess Low Temperature Dynamic Modulus of Asphalt Concrete

Effect of cyclic low temperature conditioning on stiffness modulus of asphalt concrete based on non-contact resonance testing method

Contactless Ultrasonic Wavefield Imaging to Visualize Near-Surface Damage in Concrete Elements

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