Laser vibrometry from a moving ground vehicle

Jiang, Leaf A.; Albotǎ, Marius A.; Haupt, Robert W.; Chen, Justin G.; Marino, Richard M.

doi:10.1364/ao.50.002263

Cited by 24 publications

(14 citation statements)

References 19 publications

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“…Given that, as shown in Figure 2, the apparent target velocity is two orders of magnitude higher than the true velocity in these tests, the single correction measurement already offers a valuable improvement in measurement accuracy and similar compensations have been reported in literature previously [5], [6]. However, the remaining error is far too large to present as a satisfactory outcome and, for this reason, this paper shows for the first time how an ideal means of determining the required instrument motion can be found to provide accurate and practical correction that is effective for arbitrary, six degree-of-freedom instrument vibration.…”

Section: Extent Of the Problemsupporting

confidence: 72%

Taking laser Doppler vibrometry off the tripod: correction of measurements affected by instrument vibration

Halkon

Rothberg

2017

Optics and Lasers in Engineering

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Section: Extent Of the Problemsupporting

confidence: 72%

Taking laser Doppler vibrometry off the tripod: correction of measurements affected by instrument vibration

Halkon

Rothberg

2017

Optics and Lasers in Engineering

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“…Due to the mobility and dynamic of the frame this application is rather challenging. In [13,14] the main challenges associated with the LDVMF are reported to be: limited spatial and frequency resolution due to frame mobility, Doppler offset due to the frame velocity, frame vibration, dynamic range, shot noise and especially speckle noise.…”

Section: Ldv On Moving Framementioning

confidence: 99%

Measuring with laser Doppler vibrometer on moving frame (LDVMF)

Rahimi

Dollevoet

2014

AIP Conference Proceedings

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Structural dynamic gives insight into structural properties such as mass, eigenfrequencies, eigenmodes, modal damping and strain distribution and can be utilized in structural health monitoring, dynamic sub-structuring, etc. In this context structural vibration is measured and used. The measurement is done by means of conventional sensors such as accelerometers or non destructively using Laser Doppler Vibrometer (LDV), for instance. The non-destructive, non-contact measurement techniques preserve the integrity of the structure and don't add mass and stiffness to the structure under test. When one deals with civil structures such as rail and road ways, pipelines and catenary the importance of these techniques becomes more evident as they allow standoff measurement on a moving frame. Nevertheless when LDV is employed due to the relative in-plane motion between the LDV and the target speckle noise is generated which degrades the signal quality and makes this application not very straightforward but challenging. One of the first Laser Doppler Vibrometer on moving frame is adopted to measure and monitor the ground vibration, aiming at detection of buried land mines. The major addressed difficulty in this application is the speckle noise present in the acquired signal. In general the signal quality and the Signal to Noise Ratio (SNR) are a function of the laser spot size and wave length, measurement distance, relative velocity and sampling frequency. A trade-off between these factors, which are not always intuitive would help to minimize the noise floor due to the speckle noise. In this paper a test rig is presented which allows to study the speckle noise at different measurement ranges, between 1.8 and 2.8 m, and different velocities, up to 150 km/h. The results might serve as a guideline to the design process of a LDVMF.

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“…The self-mixing architecture may be limited to shorter range standoffs (up to 3 m) compared to the homodyne and heterodyne architectures (Grund et al 2010). Laser Doppler vibrometry has also been developed for challenging environments, including detection of small ground vibrations from a moving platform (Jiang et al 2011). This work was challenging because of the vibrations from the vehicle-mounted system interfering with the ground vibration signals.…”

Section: Promising Research and Developmentmentioning

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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Laser vibrometry from a moving ground vehicle

Cited by 24 publications

References 19 publications

Taking laser Doppler vibrometry off the tripod: correction of measurements affected by instrument vibration

Taking laser Doppler vibrometry off the tripod: correction of measurements affected by instrument vibration

Measuring with laser Doppler vibrometer on moving frame (LDVMF)

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

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