Numerical simulation of speckle noise in laser vibrometry

Rothberg, Steve

doi:10.1364/ao.45.004523

Cited by 80 publications

(44 citation statements)

References 26 publications

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“…The laser vibrometer collects a portion of the backscattered speckle pattern and, when surface motion causes changes to the pattern, so-called 'speckle noise' is generated in the vibrometer output. The precise origins of this noise have been explained previously together with introduction of the term 'pseudovibration' [2,3,4].…”

Section: Laser Speckle and Pseudo-vibrationmentioning

confidence: 94%

Pseudo-vibration sensitivities for commercial laser vibrometers

Martín

Rothberg

2011

Mechanical Systems and Signal Processing

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Section: Laser Speckle and Pseudo-vibrationmentioning

confidence: 94%

Pseudo-vibration sensitivities for commercial laser vibrometers

Martín

Rothberg

2011

Mechanical Systems and Signal Processing

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“…Even when adequate signal amplitude is maintained, however, dynamic changes in the sampled speckle pattern cause noise in the photodetector output phase which results in 'speckle noise' in the vibrometer output. Its precise origins have been explained [14] together with introduction of the more general term 'pseudovibration' [15].…”

Section: Laser Speckle and Pseudo-vibrationmentioning

confidence: 99%

An international review of laser Doppler vibrometry: Making light work of vibration measurement

Rothberg

Allen

Castellini

et al. 2017

Optics and Lasers in Engineering

340

153

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In 1964, just a few years after the invention of the laser, a fluid velocity measurement based on the frequency shift of scattered light was made and the laser Doppler technique was born. This comprehensive review paper charts advances in the development and applications of laser Doppler vibrometry (LDV) since those first pioneering experiments. Consideration is first given to the challenges that continue to be posed by laser speckle. Scanning LDV is introduced and its significant influence in the field of experimental modal analysis described. Applications in structural health

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“…Speckle-induced phase variations can add noise during Doppler frequency recovery. This effect is most apparent in vibrometer systems with significant target lateral motion, in which the speckle pattern and beam intensity/phase distribution dramatically change as the distribution of surface roughness changes (Rothberg 2006).…”

Section: Performance Considerations With Optical Vibrometersmentioning

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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Numerical simulation of speckle noise in laser vibrometry

Cited by 80 publications

References 26 publications

Pseudo-vibration sensitivities for commercial laser vibrometers

Pseudo-vibration sensitivities for commercial laser vibrometers

An international review of laser Doppler vibrometry: Making light work of vibration measurement

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

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