Operational and defect parameters concerning the acoustic-laser vibrometry method for FRP-reinforced concrete

Chen, Justin G.; Haupt, Robert W.; Büyüköztürk, Oral

doi:10.1016/j.ndteint.2014.12.006

Cited by 27 publications

(10 citation statements)

References 17 publications

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“…(1). An SPL of 80 dB corresponds to an acoustic pressure of 0.2 Pa [13], while 120 dB SPL is equivalent to the pressure of 20 Pa, 100 times as much as the 80 dB. Fig.…”

Section: Test Specimenmentioning

confidence: 99%

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The Sensitivity of Acoustic-Laser Technique for Detecting the Defects in CFRP-Bonded Concrete Systems

Qiu

Lau

2016

J Nondestruct Eval

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This paper presents an experimental study to evaluate the sensitivity of acoustic-laser technique in defect detection. The technique is particularly useful towards the detection of near-surface defects in fiber reinforced polymer (FRP)-bonded concrete by vibrating the material with an acoustic excitation and measuring the vibration signals with a laser beam. However, relatively little is known about the sensitivity of acoustic-laser technique. More research work should be conducted to evaluate the effectiveness of the technique when adopted for defect detection. It is also important to investigate the limits of the technique performance with respect to varying operational conditions so as to determine ways of improving the detectability. For this purpose, operational conditions in terms of acoustic excitation and laser beam incidence are investigated for their effectiveness in detecting near-surface defects and a reliable defect detection scheme using our portable equipment is therefore recommended. This work provides a basis for further improving such technique which can be used in other engineering applications including quality control of materials and product development process.

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“…(1). An SPL of 80 dB corresponds to an acoustic pressure of 0.2 Pa [13], while 120 dB SPL is equivalent to the pressure of 20 Pa, 100 times as much as the 80 dB. Fig.…”

Section: Test Specimenmentioning

confidence: 99%

“…Therefore, sensitivity of the acoustic-laser technique is very low when the distance is more than 200 cm. An elegant solution to those issues involves in using the parametric acoustic array (PAA) that can provide more focused and powerful acoustic energy over the conventional loudspeaker [13,21].…”

mentioning

confidence: 99%

The Sensitivity of Acoustic-Laser Technique for Detecting the Defects in CFRP-Bonded Concrete Systems

Qiu

Lau

2016

J Nondestruct Eval

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“…Monitoring of wave propagation in thin metallic plates and their interaction with structural flaws is another essential discipline where LSV method has been effectively employed for the diagnosis of structural damage 17–19 . In the field of concrete NDT, LSV has been implemented for the assessment of structural condition and coherence between concrete and steel reinforcement, 20 flaw positioning in concrete elements, 21,22 monitoring of damage evolution in beam specimens under bending and cubic specimens under compression, 23 and fiber‐reinforced plastic (FRP) layer de‐bonding diagnosis 24 …”

Section: Introductionmentioning

confidence: 99%

Concrete damage mapping combining laser scanning vibrometry, dynamic response modeling, and ordinary kriging regression

Liarakos

Providakis

2020

Mat Design & Process Comms

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The present study deals with the application of laser scanning vibrometry in monitoring of concrete dynamic behavior and evaluation of dynamic response changes when structural damage occurs. Concrete specimens that exhibit different types of damage are excited artificially using a vibration shaker actuator, and velocity response is acquired on multiple points by employing a PSV‐500H laser scanning vibrometer. As optical interaction between laser beam and concrete surfaces yields speckle‐related noise to measured velocity response, multi‐peak frequency response functions are employed for the simulation of measured spectra and smoothing of induced noise. Surface mapping of concrete elements dynamic modes is achieved by exploiting ordinary kriging regression. Proposed experimental arrangement and data post‐processing are attained to illustrate efficiently concrete surficial dynamic response and reveal simultaneously velocity map discontinuities that correspond to crack existence.

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“…The acoustic-laser technique makes use of acoustic excitation generated by loudspeaker to vibrate the object and the laser beam to measure the vibrational frequency response to determine the physical characteristics of a material. The difference in the response signal could identify whether the material is intact or defective (Chen et al 2015;Qiu and Lau 2015). In the presence of acoustic wave pressure, the surface vibration of a tree trunk is excited.…”

Section: Introductionmentioning

confidence: 99%

Health assessment of tree trunk by using acoustic-laser technique and sonic tomography

et al. 2018

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An innovative tree defect detection scheme, which combines acoustic-laser technique and sonic tomography, is studied. A new sensor distribution can be adopted based on the near surface response detected by acoustic-laser technique, and a more reliable image of the tree trunk can be observed by sonic tomography. By using such hybrid detection scheme, the near surface defects (bark detachment, cracks, decay) can be revealed at the early stages of defect development. The accuracy of defect detection during advanced tree risk assessment is therefore highly improved. As a newly developed detection technique for detecting the near surface defect in tree trunk, the measurement results of acoustic-laser technique in tree trunk are comprehensively discussed, especially towards the detectable depth beneath the tree surface. The experimental results demonstrated that a newly developed acoustic-laser technique can identify the presence of near surface defects in a tree trunk that are normally overlooked in conventional sonic tomography measurements with random distribution of sensors.

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Operational and defect parameters concerning the acoustic-laser vibrometry method for FRP-reinforced concrete

Cited by 27 publications

References 17 publications

The Sensitivity of Acoustic-Laser Technique for Detecting the Defects in CFRP-Bonded Concrete Systems

The Sensitivity of Acoustic-Laser Technique for Detecting the Defects in CFRP-Bonded Concrete Systems

Concrete damage mapping combining laser scanning vibrometry, dynamic response modeling, and ordinary kriging regression

Health assessment of tree trunk by using acoustic-laser technique and sonic tomography

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