Готові списки джерел за темами / Scanning laser Doppler vibrometry

Добірка наукової літератури з теми "Scanning laser Doppler vibrometry"

Автор: Grafiati
Опубліковано: 10 грудня 2022
Оновлено: 28 січня 2023

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Статті в журналах з теми "Scanning laser Doppler vibrometry"

1

Alveringh, D., R. G. P. Sanders, R. J. Wiegerink, and J. C. Lötters. "Phase relation recovery for scanning laser Doppler vibrometry." Measurement Science and Technology 28, no. 2 (January 12, 2017): 025208. http://dx.doi.org/10.1088/1361-6501/aa53a3.

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2

Sprecher, Daniel, and Christian Hof. "Primary accelerometer calibration by scanning laser Doppler vibrometry." Measurement Science and Technology 31, no. 6 (March 17, 2020): 065006. http://dx.doi.org/10.1088/1361-6501/ab66da.

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3

Ball, Geoffrey R., Alex Huber, and Richard L. Goode. "Scanning Laser Doppler Vibrometry of the Middle Ear Ossicles." Ear, Nose & Throat Journal 76, no. 4 (April 1997): 213–22. http://dx.doi.org/10.1177/014556139707600409.

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This paper describes measurements of the vibratory modes of the middle ear ossicles made with a scanning laser Doppler vibrometer. Previous studies of the middle ear ossicles with single-point laser Doppler measurements have raised questions regarding the vibrational modes of the ossicular chain. Single-point analysis methods do not have the ability to measure multiple points on the ossicles and, consequently, have limited ability to simultaneously record relative phase information at these points. Using a Polytec Model PSV-100, detailed measurements of the ossicular chain have been completed in the human temporal bone model. This model, when driven with a middle ear transducer, provides detailed three-dimensional data of the vibrational patterns of the middle ear ossicles. Implications for middle ear implantable devices are discussed.
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4

Orta, Adil Han, Mathias Kersemans, and Koen Van Den Abeele. "On the Identification of Orthotropic Elastic Stiffness Using 3D Guided Wavefield Data." Sensors 22, no. 14 (July 15, 2022): 5314. http://dx.doi.org/10.3390/s22145314.

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Scanning laser Doppler vibrometry is a widely adopted method to measure the full-field out-of-plane vibrational response of materials in view of detecting defects or estimating stiffness parameters. Recent technological developments have led to performant 3D scanning laser Doppler vibrometers, which give access to both out-of-plane and in-plane vibrational velocity components. In the present study, the effect of using (i) the in-plane component; (ii) the out-of-plane component; and (iii) both the in-plane and out-of-plane components of the recorded vibration velocity on the inverse determination of the stiffness parameters is studied. Input data were gathered from a series of numerical simulations using a finite element model (COMSOL), as well as from broadband experimental measurements by means of a 3D infrared scanning laser Doppler vibrometer. Various materials were studied, including carbon epoxy composite and wood materials. The full-field vibrational velocity response is converted to the frequency-wavenumber domain by means of Fourier transform, from which complex wavenumbers are extracted using the matrix pencil decomposition method. To infer the orthotropic elastic stiffness tensor, an inversion procedure is developed by coupling the semi-analytical finite element (SAFE) as a forward method to the particle swarm optimizer. It is shown that accounting for the in-plane velocity component leads to a more accurate and robust determination of the orthotropic elastic stiffness parameters.
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5

Martarelli, Milena, and David J. Ewins. "Continuous scanning laser Doppler vibrometry and speckle noise occurrence." Mechanical Systems and Signal Processing 20, no. 8 (November 2006): 2277–89. http://dx.doi.org/10.1016/j.ymssp.2005.06.003.

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6

Castellini, Paolo, Milena Martarelli, and Enrico Primo Tomasini. "Laser Doppler Vibrometry for Structural Dynamic Characterization of Rotating Machinery." Applied Mechanics and Materials 415 (September 2013): 538–43. http://dx.doi.org/10.4028/www.scientific.net/amm.415.538.

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Анотація:
Laser Doppler Vibrometry (LDV) is a well established technique able to accurately measure vibration velocity of any kind of structure in remote, i.e. non-intrusive way, this allowing to overcome the problem of mass loading, typical of contact sensors as accelerometers and strain-gauges, which has strong influence in case of lightweight structures. Moreover, the possibility of driving automatically the laser beam, by means of moving mirrors controlled with galvanometer servo-actuators, permits to perform scanning measurements at different locations with high spatial resolution and reduced testing time and easily measure the operational deflection shapes (ODS) of the scanned surface. The exploitation of the moving mirrors has allowed to drive the laser beam in a continuous way making it to scan continuously over the structure surface and cover it completely. This way of operation, named Continuous Scanning LDV, permits to perform full-field measurements, the LDV output carrying simultaneously the time-and spatial-dependent information related to the structural vibration. A complementary strategy making use of the LDV coupled with moving mirrors is the so called Tracking LDV, where the laser beam is driven to follow a moving object whose trajectory must be known a priori or measured during operation (e.g. via an encoder in the case of rotating structures). In this paper some applications of the Tracking Laser Doppler Vibrometry (TLDV) and Continuous Scanning Laser Doppler Vibrometry (CSLDV) will be described they concerning, specifically modal and vibrational analysis of rotating structures.
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Kilpatrick, James M., and Vladimir B. Markov. "Full-Field Laser Vibrometer for Instantaneous Vibration Measurement and Non-Destructive Inspection." Key Engineering Materials 437 (May 2010): 407–11. http://dx.doi.org/10.4028/www.scientific.net/kem.437.407.

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We describe a system for real-time, full-field vibrometry, incorporating features of high-speed electronic speckle pattern interferometry (ESPI) and laser Doppler velocimetry (LDV). Based on a 2D interferometric sensor array, comprising 16×16 parallel illumination and detection channels, the matrix laser vibrometer (MLV), captures full-field data instantaneously, without beam scanning. The instrument design draws on the advantages of scale offered by modern telecommunications fiber optic and digital electronics. The resulting architecture, comprising a compact measurement probe linked by fiber optic umbilical to a remote electronics unit, facilitates practical application to the full-field study of transient vibrations and rapid non-destructive inspection of composite materials.
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8

Hancox, J., B. C. Staples, and R. J. Parker. "The Application of Scanning Laser Doppler vibrometry in Aero-Engine Development." Proceedings of the Institution of Mechanical Engineers, Part G: Journal of Aerospace Engineering 209, no. 1 (January 1995): 35–42. http://dx.doi.org/10.1243/pime_proc_1995_209_268_02.

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9

Chiariotti, P., M. Martarelli, and P. Castellini. "Exploiting Continuous Scanning Laser Doppler Vibrometry in timing belt dynamic characterisation." Mechanical Systems and Signal Processing 86 (March 2017): 66–81. http://dx.doi.org/10.1016/j.ymssp.2016.01.001.

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10

Derusova, Daria A., Vladimir P. Vavilov, Nikolay V. Druzhinin, Victor Y. Shpil’noi, and Alexey N. Pestryakov. "Detecting Defects in Composite Polymers by Using 3D Scanning Laser Doppler Vibrometry." Materials 15, no. 20 (October 14, 2022): 7176. http://dx.doi.org/10.3390/ma15207176.

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Анотація:
The technique of 3D scanning laser Doppler vibrometry has recently appeared as a promising tool of nondestructive evaluation of discontinuity-like defects in composite polymers. The use of the phenomenon of local defect resonance (LDR) allows intensifying vibrations in defect zones, which can reliably be detected by means of laser vibrometry. The resonance acoustic stimulation of structural defects in materials causes compression/tension deformations, which are essentially lower than the material tensile strength, thus proving a nondestructive character of the LDR technique. In this study, the propagation of elastic waves in composites and their interaction with structural inhomogeneities were analyzed by performing 3D scanning of vibrations in Fast Fourier Transform mode. At each scanning point, the in-plane (x, y) and out of plane (z) vibration components were analyzed. The acoustic stimulation was fulfilled by generating a frequency-modulated harmonic signal in the range from 50 Hz to 100 kHz. In the case of a reference plate with a flat bottom hole, the resonance frequencies for all (x, y, and z) components were identical. In the case of impact damage in a carbon fiber reinforced plastic sample, the predominant contribution into total vibrations was provided by compression/tension deformations (x, y vibration component) to compare with vibrations by the z coordinate. In general, inspection results were enhanced by analyzing total vibration patterns obtained by averaging results at some resonance frequencies.
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Дисертації з теми "Scanning laser Doppler vibrometry"

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Salman, Muhammad. "Continuous scanning laser doppler vibrometry for synchronized array measurements: applications to non-contact sensing of human body vibrations." Diss., Georgia Institute of Technology, 2012. http://hdl.handle.net/1853/45792.

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Анотація:
Laser Doppler Vibrometry (LDV) is a non-contact technique for sensing surface vibrations. Traditionally, LDV uses one or more fixed beams to measure the vibrational velocity of specific points and orientations. In order to measure an angular velocity at least two laser beams are required. Instead, this research proposes to develop a Continuous Scanning Laser Doppler Vibrometer (CSLDV) technique, based on a single laser beam continuously sweeping the area of interest using a scanning mirror. Linear scans allow the measurement of normal and angular velocity while circular scans allow the measurement of normal velocity and two angular velocities. The first part of the study analyzes the performance of rigid body models of both the short line and circular scans (< 1 cm) for measuring low broadband frequency vibrations of gel samples. This thesis focused on low frequency broadband vibration since natural human body vibrations (such as tremor or breathing) are typically below a few hundred hertz. Results for normal and angular velocity measurements are validated against conventional method of using two fixed LDVs. The second part of this research investigates the CSLDV technique for longer scans (< 5 cm). These long scans will be used to act as an array of virtual transducers at multiple points along the scanning path of the single laser beam; thus yielding similar information obtained using an array of several real fixed LDVs. A practical challenge encountered when using CSLDV is speckle noise, that is generated when a coherent light source is reflected back from an optically rough surface. The effect of speckle noise will be quantified by varying different parameters such as scan lengths, scanning frequency, target to sensor distance and the amplitude of excitation. These parameters will be optimized in order to reduce the error of vibration measurements obtained from the CSLDV. Such systems will be used to monitor multiple degrees of freedom of human skeletal muscle vibrations for elastography purposes. The forced vibration of human muscles will be analyzed using these CSLDV techniques. Overall contributions of this work include: (1) Validation of rigid body models of both short line and circular scans CSLDV for broadband low frequency linear and angular velocity measurements; (2) application to sensing natural human body vibrations (e.g., hand tremors); (3) replacement of an array of vibration sensors by a single long line scan CSLDV. (4) development of a dynamic elastography technique for skeletal muscles using CSLDV.
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Martarelli, Milena. "Exploiting the laser scanning facility for vibration measurements." Thesis, Imperial College London, 2001. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.248035.

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3

Blotter, Jonathan D. "Structural energy and power flow using a scanning laser Doppler vibrometer." Diss., This resource online, 1996. http://scholar.lib.vt.edu/theses/available/etd-06062008-151157/.

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4

Rajm, Martin. "Laserový vibrometr s 2D rozmítáním." Master's thesis, Vysoké učení technické v Brně. Fakulta elektrotechniky a komunikačních technologií, 2012. http://www.nusl.cz/ntk/nusl-219813.

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Анотація:
This thesis deals in the theoretical part with the non-contact vibration measurement by single point Laser Doppler vibrometer and it concretes constructions used in practice. It deals also with the possibilities of the laser beam scanning to measure the vibrations in the plane and there are also listed suitable-commercial systems for this solution. Mentioned sweep is immediately necessary for 2D scanning vibrometer construction. In the practical part, the single-point laser vibrometer OFV-5000 was expanded by scanning galvo system, supplemented by a measuring cards for signal acquisition from the vibrometer and suitable control hardware was chosen for mentioned laser. For the resulting hardware assembly was designed and implemented in LabVIEW measurement software, to control the 2D scanning system, to set the position of the laser beam and to process and to visualize of measured vibration signals in the plane. The functionality of the developed measuring system was checked by performed measurement and visualization of the velocity vibration of restraint girder, excited by shaker.
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5

Strean, R. Flynt. "Characterization of laser noise in free-free beam structures using a Scanning Laser Doppler Vibrometer." Thesis, This resource online, 1995. http://scholar.lib.vt.edu/theses/available/etd-02132009-171026/.

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6

Zeng, Xiandi. "The estimation and statistical inferences of the position and orientation of a scanning laser Doppler vibrometer." Diss., This resource online, 1994. http://scholar.lib.vt.edu/theses/available/etd-10302008-063011/.

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7

Manwill, Daniel Alan. "Scanning Laser Registration and Structural Energy Density Based Active Structural Acoustic Control." BYU ScholarsArchive, 2010. https://scholarsarchive.byu.edu/etd/2396.

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To simplify the measurement of energy-based structural metrics, a general registration process for the scanning laser doppler vibrometer (SLDV) has been developed. Existing registration techniques, also known as pose estimation or position registration, suffer from mathematical complexity, instrument specificity, and the need for correct optimization initialization. These difficulties have been addressed through development of a general linear laser model and hybrid registration algorithm. These are applicable to any SLDV and allow the registration problem to be solved using straightforward mathematics. Additionally, the hybrid registration algorithm eliminates the need for correct optimization initialization by separating the optimization process from solution selection. The effectiveness of this approach is demonstrated through simulated application and by validation measurements performed on a specially prepared pipe. To increase understanding of the relationships between structural energy metrics and the acoustic response, the use of structural energy density (SED) in active structural acoustic control (ASAC) has also been studied. A genetic algorithm and other simulations were used to determine achievable reduction in acoustic radiation, characterize control system design, and compare SED-based control with the simpler velocity-based control. Using optimized sensor and actuator placements at optimally excited modal frequencies, attenuation of net acoustic intensity was proportional to attenuation of SED. At modal and non-modal frequencies, optimal SED-based ASAC system design is guided by establishing general symmetry between the structural disturbing force and the SED sensor and control actuator. Using fixed sensor and actuator placement, SED-based control has been found to provide superior performance to single point velocity control and very comparable performance to two-point velocity control. Its greatest strength is that it rarely causes unwanted amplifications of large amplitude when properly designed. Genetic algorithm simulations of SED-based ASAC indicated that optimal control effectiveness is obtained when sensors and actuators function in more than one role. For example, an actuator can be placed to simultaneously reduce structural vibration amplitude and reshape the response such that it radiates less efficiently. These principles can be applied to the design of any type of ASAC system.
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Jones, Cameron Bennion. "Development and Validation of a Vibration-Based Sound Power Measurement Method." BYU ScholarsArchive, 2019. https://scholarsarchive.byu.edu/etd/9260.

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The International Organization for Standardization (ISO) provides no vibration-based sound power measurement standard that provides Precision (Grade 1) results. Current standards that provide Precision (Grade 1) results require known acoustic environments or complex setups. This thesis details the Vibration Based Radiation Mode (VBRM) method as one approach that could potentially be used to develop a Precision (Grade 1) standard. The VBRM method uses measured surface velocities of a structure and combines them with the radiation resistance matrix to calculate sound power. In this thesis the VBRM method is used to measure the sound power of a single-plate and multiple plate system. The results are compared to sound power measurements using ISO 3741 and good alignment between the 200 Hz and 4 kHz one-third octave band is shown. It also shows that in the case of two plates separated by a distance and driven with uncorrelated sources, the contribution to sound power of each individual plate can be calculated while they are simultaneously excited. The VBRM method is then extended to account for acoustically radiating cylindrical geometries. The mathematical formulations of the radiation resistance matrix and the accompanying acoustic radiation modes of a baffled cylinder are developed. Numberical sound power calculations using the VBRM method and a boundary element method (BEM) are compared and show good alignment. Experimental surface velocity measurements of a cylinder are taken using a scanning laser Doppler vibrometer (SLDV) and the VBRM method is used to calculate the sound power of a cylinder experimentally. The results are compared to sound power measurements taken using ISO 3741.
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9

Iverson, Thomas Z. "Signature Stability in Laser Doppler Vibrometry." University of Dayton / OhioLINK, 2017. http://rave.ohiolink.edu/etdc/view?acc_num=dayton1497386740815576.

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Himes, Benjamin John. "Development and Analysis of a Vibration Based Sleep Improvement Device." BYU ScholarsArchive, 2020. https://scholarsarchive.byu.edu/etd/9168.

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Many research studies have analyzed the effect that whole-body vibration (WBV) has on sleep, and some have sought to use vibration to treat sleep disorders such as insomnia. It has been shown that low frequencies (f < 2Hz) are generally sleep inducing, but oscillations of this frequency are typically difficult to achieve using electromagnetic vibration drives. In the research that has been performed, optimal vibration parameters have not been determined, and the effects of multiple vibration sources vibrating at different frequencies to induce a low frequency traveling wave have not been explored. Insomnia affects millions of people worldwide, and non-pharmacological treatment options are limited. A bed excited with multiple vibration sources was used to explore beat frequency vibration as a non-pharmacological treatment for insomnia. A repeated measures design pilot study of 14 participants with mild-moderate insomnia symptom severity was conducted to determine the effects of beat frequency vibration, and traditional standing wave vibration on sleep latency and quality. Participants were monitored using high-density electroencephalography (HD-EEG). Sleep latency was compared between treatment conditions. Trends of a decrease in sleep latency due to beat frequency vibration were found (p ≤ 0.181 for AASM latency, and p ≤ 0.068 for unequivocal sleep latency). Neural complexity during wake, N1, and N2 stages were compared using Multi-Scale Sample Entropy (MSE), which demonstrated significantly lower MSE between wake and N2 stages (p ≤ 0.002). Lower MSE was found in the transition from wake to N1 stage sleep but did not reach significance (p ≤ 0.300). During N2 sleep, beat frequency vibration shows lower MSE than the control session in the left frontoparietal region. This indicates that beat frequency vibration may lead to a decrease of conscious awareness during deeper stages of sleep. Standing wave vibration caused reduced Alpha activity and increased Delta activity during wake. Beat frequency vibration caused increased Delta activity during N2 sleep. These preliminary results suggest that beat frequency vibration may help individuals with insomnia symptoms by decreasing sleep latency, by reducing their conscious awareness, and by increasing sleep drive expression during deeper stages of sleep. Standing wave vibration may be beneficial for decreasing expression of arousal and increasing expression of sleep drive during wake, implying that a dynamic vibration treatment may be beneficial. The application of vibration treatment as part of a heuristic sleep model is discussed.
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Книги з теми "Scanning laser Doppler vibrometry"

1

Tomasini, Enrico Primo, and Paolo Castellini, eds. Laser Doppler Vibrometry. Berlin, Heidelberg: Springer Berlin Heidelberg, 2020. http://dx.doi.org/10.1007/978-3-662-61318-4.

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2

Kroschel, Kristian, ed. Laser Doppler Vibrometry for Non-Contact Diagnostics. Cham: Springer International Publishing, 2020. http://dx.doi.org/10.1007/978-3-030-46691-6.

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3

Kroschel, Kristian. Laser Doppler Vibrometry for Non-Contact Diagnostics. Springer International Publishing AG, 2020.

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4

Kroschel, Kristian. Laser Doppler Vibrometry for Non-Contact Diagnostics. Springer International Publishing AG, 2021.

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5

Castellini, Paolo, and Enrico Primo Tomasini. Laser Doppler Vibrometry: A Multimedia Guide to its Features and Usage. Springer, 2020.

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6

V, Edwards Robert, and United States. National Aeronautics and Space Administration., eds. A vector scanning processing technique for pulsed laser velocimetry. [Washington, DC]: National Aeronautics and Space Administration, 1989.

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7

A, DiMarzio Charles, and United States. National Aeronautics and Space Administration. Scientific and Technical Information Branch., eds. Precision pointing using a dual-wedge scanner. [Washington, D.C.]: National Aeronautics and Space Administration, Scientific and Technical Information Branch, 1985.

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Частини книг з теми "Scanning laser Doppler vibrometry"

1

Witt, Bryan, and Brandon Zwink. "Pushing 3D Scanning Laser Doppler Vibrometry to Capture Time Varying Dynamic Characteristics." In Rotating Machinery, Vibro-Acoustics & Laser Vibrometry, Volume 7, 111–21. Cham: Springer International Publishing, 2018. http://dx.doi.org/10.1007/978-3-319-74693-7_11.

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2

Chen, Da-Ming, and W. D. Zhu. "Rapid and Dense 3D Vibration Measurement by Three Continuously Scanning Laser Doppler Vibrometers." In Rotating Machinery, Vibro-Acoustics & Laser Vibrometry, Volume 7, 19–29. Cham: Springer International Publishing, 2018. http://dx.doi.org/10.1007/978-3-319-74693-7_3.

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3

Martarelli, M., P. Castellini, and A. Annessi. "Nondestructive Consolidation Assessment of Historical Camorcanna Ceilings by Scanning Laser Doppler Vibrometry." In Model Validation and Uncertainty Quantification, Volume 3, 1–10. Cham: Springer International Publishing, 2019. http://dx.doi.org/10.1007/978-3-030-12075-7_1.

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4

Chiariotti, P., G. M. Revel, and M. Martarelli. "Exploiting Continuous Scanning Laser Doppler Vibrometry and Wavelet Processing for Damage Detection." In Experimental Techniques, Rotating Machinery, and Acoustics, Volume 8, 189–96. Cham: Springer International Publishing, 2015. http://dx.doi.org/10.1007/978-3-319-15236-3_18.

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5

Chen, Da-Ming, Y. F. Xu, and W. D. Zhu. "Delamination Identification of Laminated Composite Plates Using a Continuously Scanning Laser Doppler Vibrometer System." In Rotating Machinery, Vibro-Acoustics & Laser Vibrometry, Volume 7, 9–18. Cham: Springer International Publishing, 2018. http://dx.doi.org/10.1007/978-3-319-74693-7_2.

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6

Eichenberger, Jerome, and Joerg Sauer. "Validating Complex Models Accurately and Without Contact Using Scanning Laser Doppler Vibrometry (SLDV)." In Rotating Machinery, Optical Methods & Scanning LDV Methods, Volume 6, 113–24. Cham: Springer International Publishing, 2021. http://dx.doi.org/10.1007/978-3-030-76335-0_11.

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7

Rohe, Daniel P. "Modal Testing of a Nose Cone Using Three-Dimensional Scanning Laser Doppler Vibrometry." In Rotating Machinery, Hybrid Test Methods, Vibro-Acoustics & Laser Vibrometry, Volume 8, 43–55. Cham: Springer International Publishing, 2016. http://dx.doi.org/10.1007/978-3-319-30084-9_5.

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8

Witt, Bryan, Brandon Zwink, and Ron Hopkins. "Applications of 3D Scanning Laser Doppler Vibrometry to an Article with Internal Features." In Rotating Machinery, Hybrid Test Methods, Vibro-Acoustics & Laser Vibrometry, Volume 8, 85–95. Cham: Springer International Publishing, 2017. http://dx.doi.org/10.1007/978-3-319-54648-3_9.

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Mignanelli, L., P. Chiariotti, P. Castellini, and M. Martarelli. "Blind Identification of Operational Deflection Shapes from Continuous Scanning Laser Doppler Vibrometry Data." In Sensors and Instrumentation, Volume 5, 105–11. Cham: Springer International Publishing, 2016. http://dx.doi.org/10.1007/978-3-319-29859-7_11.

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Schwarz, Sascha, Stefanie Kiderlen, Robert Moerl, Stefanie Sudhop, Hauke Clausen-Schaumann, and Daniel J. Rixen. "Investigating the Feasibility of Laser-Doppler Vibrometry for Vibrational Analysis of Living Mammalian Cells." In Rotating Machinery, Optical Methods & Scanning LDV Methods, Volume 6, 31–36. Cham: Springer International Publishing, 2020. http://dx.doi.org/10.1007/978-3-030-47721-9_4.

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Тези доповідей конференцій з теми "Scanning laser Doppler vibrometry"

1

Burgett, Richard, Vyacheslav Aranchuk, James Sabatier, and Steven S. Bishop. "Demultiplexing multiple-beam laser Doppler vibrometry for continuous scanning." In SPIE Defense, Security, and Sensing, edited by Russell S. Harmon, J. Thomas Broach, and John H. Holloway, Jr. SPIE, 2009. http://dx.doi.org/10.1117/12.818219.

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Kurdila, Andrew. "Scanning Laser Doppler Vibrometry for Delamination Detection in Frescoes." In 45th AIAA/ASME/ASCE/AHS/ASC Structures, Structural Dynamics & Materials Conference. Reston, Virigina: American Institute of Aeronautics and Astronautics, 2004. http://dx.doi.org/10.2514/6.2004-1539.

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3

Hebel, Marcus, Karl-Heinz Bers, and Volker H. Klein. "Model-based mine verification with scanning laser Doppler vibrometry data." In Defense and Security, edited by Russell S. Harmon, J. Thomas Broach, and John H. Holloway, Jr. SPIE, 2004. http://dx.doi.org/10.1117/12.541512.

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4

O’Malley, Patrick F., John A. Judge, and Joseph F. Vignola. "Three Dimensional Vibration Measurements Using a Five-Axis Scanning Laser Vibrometry System." In ASME 2007 International Design Engineering Technical Conferences and Computers and Information in Engineering Conference. ASMEDC, 2007. http://dx.doi.org/10.1115/detc2007-35094.

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This paper describes an experimental facility designed to measure three-dimensional velocity components using a five-axis laser vibrometry system. A single-point laser Doppler vibrometer (LDV) is mounted on three orthogonal translation stages, and the beam is directed to the target specimen by means of a mirror mounted at the intersection of the axes of two rotational stages. The result is a system with which the vibration of points on the surface of the test specimen can be measured from multiple angles, and these multiple measured components of the surface velocity are combined to determine the full velocity vector in three-dimensions. This system allows collection of a richer data set for more detailed vibration analysis, measurement of vibration of non-planar surfaces, and greater control over measurements compared to conventional single-beam scanning LDV, while greatly reducing experimental facility costs compared with threedimensional LDV systems that use multiple lasers.
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Gade, Svend, Nis Møller, Niels-Jørgen Jacobsen, and Boyd Hardonk. "Scanning Laser Doppler Vibrometer Type." In SAE Brasil 2002 Congress and Exhibit. 400 Commonwealth Drive, Warrendale, PA, United States: SAE International, 2002. http://dx.doi.org/10.4271/2002-01-3575.

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6

Castellini, Paolo, and Milena Martarelli. "Aeroacoustic characterization of turbulent free jets using scanning laser Doppler vibrometry." In Sixth International Conference on Vibration Measurements by Laser Techniques: Advances and Applications. SPIE, 2004. http://dx.doi.org/10.1117/12.579757.

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7

Khan, Altaf, Zoujun Dai, and Thomas J. Royston. "Measuring and Modeling Elastography of Human Cornea Using Scanning Laser Doppler Vibrometry." In ASME 2013 Summer Bioengineering Conference. American Society of Mechanical Engineers, 2013. http://dx.doi.org/10.1115/sbc2013-14566.

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Our interest is in noninvasively mapping the viscoelastic properties of the human cornea with the aid of a Scanning Laser Doppler Vibrometer (SLDV). Mechanical properties of the cornea can be used to predict early onset of diseases, such as glaucoma and keratoconus. By applying mechanical vibration near the cornea and measuring the dynamic wave propagation across the cornea, an elastographic map can be reconstructed. To effectively reconstruct the data, an appropriate analytical solution is needed to interpret the measured motion; in the present article, we review initial measurements and modeling of phantom cornea models. Several viscoelastic plate phantoms were constructed using silicone gels to simulate corneal structures. Comprehensive frequency sweeps were performed on these phantoms. The material can be represented using a fractional order model of viscoelasticity. Similar experiments have been completed on ex-vivo human cornea from donor eyes. The design shows proof of concept and is now being modified to a more applicable manner for in vivo experiments.
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Tian, Zhenhua, Stephen Howden, Linlin Ma, Bin Lin, and Lingyu Yu. "Damage Detection in Thick Steel Plates Using Guided Ultrasonic Waves and Non-Contact Laser Vibrometry." In ASME 2016 Pressure Vessels and Piping Conference. American Society of Mechanical Engineers, 2016. http://dx.doi.org/10.1115/pvp2016-63744.

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This paper presents damage detection in thick steel plates by using guided ultrasonic waves and non-contact laser vibrometry. Guided waves are generated by piezoelectric transducers (PZT). A scanning laser Doppler vibrometer is used to measure the full velocity wavefield of guided waves in the plate, based on the Doppler Effect. The measured full wavefield in terms of time and space contains a wealth of information regarding guided wave propagation in the plate as well as guided wave interaction with damage. Through wavefield analysis, the cumulative energy map of damage induced waves is derived for damage detection and quantification. For the proof of concept, an experiment is performed on a ¼ inch steel plate with three surface defects of different sizes and shapes. The detection result shows that the locations and sizes of high energy areas in the cumulative energy map agree well with those of the actual defects. Overall the method presented in this paper using guided waves and non-contact laser vibrometry is effective to detect and quantify location, size and shape of damage in thick steel plates.
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Esposito, Enrico, M. Navarri, S. Papalini, M. Pontillo, Enrico P. Tomasini, and R. Toppi. "Experimental determination of air influence on loudspeaker cone vibrations by scanning laser Doppler vibrometry." In Fifth International Conference on Vibration Measurements by Laser Techniques, edited by Enrico P. Tomasini. SPIE, 2002. http://dx.doi.org/10.1117/12.468190.

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10

Yang, Shifei, David Ehrhardt, and Matthew S. Allen. "A Review of Signal Processing Techniques for Continuous-Scan Laser Doppler Vibrometry." In ASME 2014 International Design Engineering Technical Conferences and Computers and Information in Engineering Conference. American Society of Mechanical Engineers, 2014. http://dx.doi.org/10.1115/detc2014-34972.

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A Laser Doppler Vibrometer (LDV) measures the laser Doppler frequency shift and converts it to the velocity at a point of a structure along the laser beam direction. In commercially available scanning LDV, the laser is redirected by a pair of orthogonal mirrors from one point to another, measuring the responses at these points sequentially. Continuous-Scan Laser Doppler Vibrometry (CSLDV) is built on scanning LDV; the laser sweeps continuously over a structure while recording the response along the laser path. The continuous-scan approach can greatly accelerate modal testing, providing spatially detailed vibration shape of the structure at tens or even hundreds of points in the time that is required to measure the vibration at a single point. However, extracting vibration shapes from CSLDV measurements is challenging because the laser spot is continuously moving. This technical difficulty and the equipment cost have become the major barriers that prevent the widespread use of CSLDV. Several algorithms to extract vibration shapes have been developed since CSLDV was introduced. Ewins et al proposed a polynomial approach that treats the vibration shape along the laser scan path as a polynomial function of the laser position. The polynomial coefficients were found from the sideband harmonics in the frequency spectrum of the acquired velocity signal. Allen et al proposed a lifting approach that collects the measured responses at the same location along the laser path. The reorganized measurements appear to be from a set of pseudo transducers attached to the structure. Hence, the well-established conventional modal identification routines can be applied to process CSLDV measurement. Algorithms based on linear time periodic system identification theory were explored as well. These algorithms are based on the fact that the measured velocities along the laser path are the responses of a special liner time periodic system when a closed, periodic laser scan pattern is employed. For the first time, this work compares these signal processing techniques employed in different applications using the same set of data obtained from a cantilever beam. The noise and uncertainty in the reconstructed vibration shapes are discussed in order to present the advantages and disadvantages of each method.
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Звіти організацій з теми "Scanning laser Doppler vibrometry"

1

CALIFORNIA UNIV LIVERMORE RADIATION LAB. Scanning Laser Doppler Vibrometer System. Fort Belvoir, VA: Defense Technical Information Center, March 2001. http://dx.doi.org/10.21236/ada395304.

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2

Donskoy, Dimitri. Acquisition of Scanning Laser-Doppler Vibrometer System for Detection and Nondestructive Characterization of Interfaces. Fort Belvoir, VA: Defense Technical Information Center, October 2001. http://dx.doi.org/10.21236/ada398486.

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3

Rohe, Daniel Peter. Documentation and Instructions for Running Two Python Scripts that Aid in Setting up 3D Measurements using the Polytec 3D Scanning Laser Doppler Vibrometer. Office of Scientific and Technical Information (OSTI), August 2015. http://dx.doi.org/10.2172/1213303.

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4

Hubbard, Joshua Allen. Experimental study of microparticle adhesion and resuspension with Laser Doppler Vibrometry. Office of Scientific and Technical Information (OSTI), September 2012. http://dx.doi.org/10.2172/1051712.

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5

Biedermann, Laura Butler. Vibrational spectra of nanowires measured using laser doppler vibrometry and STM studies of epitaxial graphene : an LDRD fellowship report. Office of Scientific and Technical Information (OSTI), September 2009. http://dx.doi.org/10.2172/973355.

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6

Saric, William S. Multi-Axis, 3-D, Scanning LDA (Laser Doppler Anemometer)o System for Unsteady Aerodynamics. Fort Belvoir, VA: Defense Technical Information Center, December 1989. http://dx.doi.org/10.21236/ada218571.

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