A comparison of 1D and 3D laser vibrometry measurements of Lamb waves

Swenson, Eric D.; Sohn, Hoon; Olson, Steven E.; DeSimio, Martin P.

doi:10.1117/12.847362

Cited by 19 publications

(22 citation statements)

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“…There are quite a few articles on the accuracy of LDV systems and their dependence on surface roughness as a function of frequency [2,4]. In addition, LDVs were originally developed for out of plane displacements, while one can also measure in-plane displacements using 3D laser systems [5,6] or with specific surface coatings [7,8]. Figure 1 shows a setup of an LDV head on a polished aluminum surface in order to measure out of plane displacements.…”

Section: Introductionmentioning

confidence: 99%

Assessment of coating layers on the accuracy of displacement measurement in laser Doppler vibrometry

Hasanian

Lissenden

2017

AIP Conference Proceedings

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Section: Introductionmentioning

confidence: 99%

Assessment of coating layers on the accuracy of displacement measurement in laser Doppler vibrometry

Hasanian

Lissenden

2017

AIP Conference Proceedings

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“…Optically generated and/or detected ultrasound (photo-acoustic imaging) uses high-power laser pulses to thermally excite ultrasonic waves within metals 10.6 or other materials. Sensitive detection is accomplished using optical interference methods similar to those used for laser vibrometry (Swenson et al 2010). Photo-acoustic imaging or analysis may potentially be used for inspection of mechanical integrity such as cracks or component weakening (Anheier et al 2012).…”

Section: Related Techniquesmentioning

confidence: 99%

Technical Readiness and Gaps Analysis of Commercial Optical Materials and Measurement Systems for Advanced Small Modular Reactors

Anheier¹,

Suter²,

Qiao³

et al. 2013

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Energy Research and Development Roadmap and industry stakeholders by evaluating optically based instrumentation and control (I&C) concepts for advanced small modular reactor (AdvSMR) applications. These advanced designs will require innovative thinking in terms of engineering approaches, materials integration, and I&C concepts to realize their eventual viability and deployment. The primary goals of this report include:1. Establish preliminary I&C needs, performance requirements, and possible gaps for AdvSMR designs based on best-available published design data.2. Document commercial off-the-shelf (COTS) optical sensors, components, and materials in terms of their technical readiness to support essential AdvSMR in-vessel I&C systems.3. Identify technology gaps by comparing the in-vessel monitoring requirements and environmental constraints to COTS optical sensor and materials performance specifications.4. Outline a future research, development, and demonstration (RD&D) program plan that addresses these gaps and develops optical-based I&C systems that enhance the viability of future AdvSMR designs.The DOE-NE roadmap outlines RD&D activities intended to overcome technical barriers that currently limit advances in nuclear energy. As part of this strategy, DOE-NE is sponsoring research on advanced reactor supportive technologies to reduce the identified barriers. Key challenges that must be overcome include the high capital costs to develop nuclear power plants, maintaining safety performance as the reactor fleet expands, minimizing nuclear waste, and maintaining strong proliferation resistance. AdvSMR designs are a major component of this strategy, because these designs offer a number of unique advantages. The modular and small size of AdvSMR designs naturally lead to reduced capital investments and, potentially, construction savings through factory fabrication. However, new economic and technical challenges accompany the many attractive features offered by AdvSMR designs. Specifically, the modest power output of AdvSMRs does not provide the economy of scale afforded by large reactors. In addition, many of the AdvSMR designs operate at much higher temperatures than lightwater reactors and require instrumentation to withstand harsh, in-vessel environments arising from unconventional, chemically aggressive coolants and unique reactor system configurations.Addressing these I&C challenges will be critically important to the AdvSMR development program to ensure the viability and future success of advanced reactor designs. Solutions will likely be found through evolution of conventional reactor technology, and the development of entirely new concepts. Early pressure/boiling water reactors used conventional I&C technologies (e.g., thermocouples, ionchambers, strain-gauge pressure sensors) to satisfy design requirements. Because these technologies worked well in the relatively low-temperature reactor designs, the demand for alternate I&C technologies was limited. At the time, optical-based reactor monitoring concepts were g...

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“…To verify the EFIT simulations, the wavefield in the aluminum plate is also measured and visualized using a 1D SLDV [8][9][10][11][12][13][14][15][16][17][18][19][20] (model Polytec PSV-400-M2). This SLDV can measure the wave velocity/displacement component in the direction of the laser beam, based on the Doppler Effect on light waves.…”

Section: Experimental Verificationmentioning

confidence: 99%

“…A detailed description of the use of PZT sensors can be found in [7]. Recently, the scanning laser Doppler vibrometers (SLDV) have been used as a means for non-contact remote sensing in ultrasonic wavefield measurement due to the fact that these systems can make accurate surface velocity/displacement measurements over a spatially-dense grid and provide high resolution image sequences of wave propagation [8][9][10][11][12][13][14][15][16][17][18][19][20]. Specifically, Staszewski et al illustrated the concept of Lamb wave sensing utilizing a 1D laser Doppler vibrometer [12].…”

Section: Introductionmentioning

confidence: 99%

“…Specifically, Staszewski et al illustrated the concept of Lamb wave sensing utilizing a 1D laser Doppler vibrometer [12]. Swenson et al compared 1D and 3D SLDV measurements in the time domain for Lamb waves that were excited by a PZT [8]. Olson et al used 1D and 3D SLDV to provide Lamb wave finite element modeling validation via time domain comparisons [17].…”

Section: Introductionmentioning

confidence: 99%

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Crack detection with Lamb wave wavenumber analysis

et al. 2013

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In this work, we present our study of Lamb wave crack detection using wavenumber analysis. The aim is to demonstrate the application of wavenumber analysis to 3D Lamb wave data to enable damage detection. The 3D wavefields (including v x , v y and v z components) in time-space domain contain a wealth of information regarding the propagating waves in a damaged plate. For crack detection, three wavenumber analysis techniques are used: (i) two dimensional Fourier transform (2D-FT) which can transform the time-space wavefield into frequency-wavenumber representation while losing the spatial information; (ii) short space 2D-FT which can obtain the frequency-wavenumber spectra at various spatial locations, resulting in a space-frequency-wavenumber representation; (iii) local wavenumber analysis which can provide the distribution of the effective wavenumbers at different locations. All of these concepts are demonstrated through a numerical simulation example of an aluminum plate with a crack. The 3D elastodynamic finite integration technique (EFIT) was used to obtain the 3D wavefields, of which the v z (out-of-plane) wave component is compared with the experimental measurement obtained from a scanning laser Doppler vibrometer (SLDV) for verification purposes. The experimental and simulated results are found to be in close agreement. The application of wavenumber analysis on 3D EFIT simulation data shows the effectiveness of the analysis for crack detection.

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A comparison of 1D and 3D laser vibrometry measurements of Lamb waves

Cited by 19 publications

References 0 publications

Assessment of coating layers on the accuracy of displacement measurement in laser Doppler vibrometry

Assessment of coating layers on the accuracy of displacement measurement in laser Doppler vibrometry

Technical Readiness and Gaps Analysis of Commercial Optical Materials and Measurement Systems for Advanced Small Modular Reactors

Crack detection with Lamb wave wavenumber analysis

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