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Добірка наукової літератури з теми "Laser vibrometro"

Автор: Grafiati

Опубліковано: 11 березня 2023

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Статті в журналах з теми "Laser vibrometro"

Adamczak, Stanisław, Mateusz Wrzochal, and Numan Durakbasa. "Evaluation of a non-contact method for measuring vibration of rolling bearings in industrial conditions." Mechanik 93, no. 2 (February 14, 2020): 8–11. http://dx.doi.org/10.17814/mechanik.2020.2.5.

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Using of laser vibrometers in vibration measurement systems brings additional benefits due to the lack of impact of the sensor on the tested measuring system. Recently, leading rolling bearing manufacturers are equipping their diagnostic measuring systems with non-contact sensors. Doppler laser vibrometers are used interchangeably for electrodynamic sensors. This paper attempts to assess the vibrometer in use for measuring vibration of rolling bearings in industrial conditions.

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Breaban, Florin, Roger Debuchy, and Didier Defer. "Laser Scanning Vibrometry and Holographic Interferometry Applied to Vibration Study." Applied Mechanics and Materials 801 (October 2015): 303–11. http://dx.doi.org/10.4028/www.scientific.net/amm.801.303.

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The applications of high performance materials in the aerospace and in the automotive technology in the next years need to develop new vibration study, nondestructive testing, predictive maintenance and industrial control methods.The Laser Scanning Vibrometry and Holographic Interferometry methods of vibration study and nondestructive testing by modal analysis are described. The Laser Scanning Vibrometer PSV 400 is made by Polytec GmbH and the PSV software reconstructs the 3D model of the measured micro-deformation of the object. The holographic laser system HLS-3 from Lumonics Inc. has 100 MW ruby laser peak power and 30 ns pulse width.Using mechanical excitation to induce a measurable vibration, the Laser Scanning Vibrometry and Holographic Interferometry modal analysis measurements show up the vibrational signatures and the damaged areas of the objects made by high performance materials - polymers, composites.

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He, Wen, Guanhua Xu, Zuochao Rong, Gen Li, and Min Liu. "Automatic Calibration System for Digital-Display Vibrometers Based on Machine Vision." Metrology and Measurement Systems 21, no. 2 (June 1, 2014): 317–28. http://dx.doi.org/10.2478/mms-2014-0027.

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Abstract Considering the low efficiency during the process of traditional calibration for digital-display vibrometers, an automatic calibration system for vibrometers based on machine vision is developed. First, an automatic vibration control system is established on the basis of a personal computer, and the output of a vibration exciter on which a digital-display vibrometer to be calibrated is installed, is automatically adjusted to vibrate at a preset vibration level and a preset frequency. Then the display of the vibrometer is captured by a digital camera and identified by means of image recognition. According to the vibration level of the exciter measured by a laser interferometer and the recognized display of the vibrometer, the properties of the vibrometer are calculated and output by the computer. Image recognition algorithms for the display of the vibrometer with a high recognition rate are presented, and the recognition for vibrating digits and alternating digits is especially analyzed in detail. Experimental results on the built-up system show that the prposed image recognition methods are very effective and the system could liberate operators from boring and intense calibration work for digital-display vibrometers

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Szeleziński, Adam, Adam Muc, Lech Murawski, Marcin Kluczyk, and Tomasz Muchowski. "Application of Laser Vibrometry to Assess Defects in Ship Hull’s Welded Joints’ Technical Condition." Sensors 21, no. 3 (January 29, 2021): 895. http://dx.doi.org/10.3390/s21030895.

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The paper presents the measurement process and test results for six thin-walled plates with different dynamic characteristics caused by different defects of welded joints. The tests were carried out using non-destructive testing (NDT). The authors made an attempt to determine the validity of the use and degree of effectiveness of the tests based on laser vibrometry in detecting defects in welded joints. The tests of welded plates were carried out using displacement laser sensors and piezoelectric accelerometers, while the source of vibration extortion was a modal hammer. In the adopted measurement methodology, the application of accelerometers was to obtain the reference data, which allowed for comparison with the measurement data obtained from the laser vibrometer. The analysis of the obtained measurement data, in the fields of time and frequency, made it possible to verify the correctness of the data obtained by means of laser vibrometry and to determine the requirements which are necessary for the correct performance of NDT tests and in the future structural health monitoring (SHM) system of welded joints with the use of a laser vibrometer. The mathematical model developed in the MSC software Pastran-Nastran was also used in the work. The model was developed for the purpose of mutual verification of the measurement and calculation tests. At the present stage of work, it can be stated that the results obtained by laser vibrometry methods should be treated as a supplement to the research conducted with traditional piezoelectric accelerometers. In certain situations, they can be used as an alternative to accelerometers, due to the fact that laser sensors do not require direct contact with the examined object. Where the object under test may be in a strong electromagnetic field, optical sensors are better suited than contact sensors.

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McDevitt, T. E., G. H. Koopmann, and C. B. Burroughs. "Two-Channel Laser Vibrometer Techniques for Vibrational Intensity Measurements: Part 2—Longitudinal Intensity." Journal of Vibration and Acoustics 116, no. 1 (January 1, 1994): 100–104. http://dx.doi.org/10.1115/1.2930384.

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This paper extends the application of a two-channel vibrometer technique from the measurement of flexural energy flow (detailed in Part 1) to the measurement of longitudinal energy flow. The two-channel longitudinal energy flow equations and two one-dimensional validation methods are presented along with a discussion of how laser vibrometry functions for the measurement of in-plane vibratory motion. Adaptations of the energy flow equations to laser vibrometry are also presented. Experimental results are illustrated which contain the influence of a bending-induced longitudinal component of motion. Through a mathematical model, the measurement of the longitudinal energy flow is shown to be accurate if the influence of bending-induced longitudinal motion is removed.

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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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Schewe, M., M. A. A. Ismail, and C. Rembe. "Towards airborne laser Doppler vibrometry for structural health monitoring of large and curved structures." Insight - Non-Destructive Testing and Condition Monitoring 63, no. 5 (May 1, 2021): 280–82. http://dx.doi.org/10.1784/insi.2021.63.5.280.

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Анотація:

Laser Doppler vibrometry is an important sensing technology for many structural health monitoring (SHM) methods, such as modal analysis. However, when it comes to large civil structures, for example historic structures and bridges, the applicability of laser Doppler vibrometry is significantly constrained by inaccessible remote surfaces. Some of these surfaces are fully inaccessible to a ground-mounted laser Doppler vibrometer (LDV), while others are partially inaccessible, and measurements are only possible for low incident angles. Consequently, LDV measurements are either impossible or have a weak signal strength. In this study, the concept of constructing an airborne LDV for SHM is explored, including the examination of a recently developed mechanism, the partially airborne LDV, comprising a reflective mirror attached to a drone. Preliminary proof of concept laboratory tests have been successfully conducted using two different set-ups and drone models.

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Rothberg, S. J., and N. A. Halliwell. "Vibration Measurements on Rotating Machinery Using Laser Doppler Velocimetry." Journal of Vibration and Acoustics 116, no. 3 (July 1, 1994): 326–31. http://dx.doi.org/10.1115/1.2930432.

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This paper explores the use of laser vibrometry for vibration measurement directly from a rotating component. The presence of a surface velocity component due to the rotation itself is shown to create a strong measurement dependency on vibration perpendicular to the intended measurement direction. Particular ambiguity results at synchronous frequencies. A mathematical means to resolve the genuine vibration components from two simultaneous laser vibrometer measurements is presented and shown to be effective in the study of nonsynchronous rotor vibrations.

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Nakagawa, Heisaburo, Yutaka Kurita, Keiji Ogawa, Yuji Sugiyama, and Hideyasu Hasegawa. "Experimental Analysis of Chatter Vibration in End-Milling Using Laser Doppler Vibrometers." International Journal of Automation Technology 2, no. 6 (November 5, 2008): 431–38. http://dx.doi.org/10.20965/ijat.2008.p0431.

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A problem has emerged during the end-milling of hardened steels: a high frequency chattering phenomenon. On the other hand, a laser Doppler vibrometer has recently been developed to observe such high frequency vibration phenomena. Therefore, we propose a new method of monitoring chattering in the end-milling of hardened steels using laser Doppler vibrometers. The chattering behaviors of the end-mill shank were measured by two laser Doppler vibrometers from the feed and radial directions at the same time during the end-milling of the hardened steel. The following conclusions were reached: (1) Two kinds of chatter vibrations were confirmed as vibration modes whose frequencies differed during high and low cutting speed conditions. (2) The chatter vibrations at the high cutting speeds clearly differed from regenerative chatter, which has only been researched so far, by accurate measurement of chatter vibration modes.

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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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Більше джерел

Дисертації з теми "Laser vibrometro"

Lima, Pedro Henrique Ramos de. "Análise modal experimental de placa flexível acoplada à cavidade acústica por vibrometro laser." reponame:Repositório Institucional da UnB, 2017. http://repositorio.unb.br/handle/10482/31273.

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Dissertação (mestrado)—Universidade de Brasília, Faculdade de Tecnologia, Departamento de Engenharia Mecânica, 2017.
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O estudo da vibroacústica, uma área de interação fluido-estrutura, é extremamente importante em diversos ramos da engenharia, como civil, mecânica, aeronáutica, naval, nuclear e bioengenharia. Uma fonte de ruído em cavidades ocorre pela interação entre a estrutura flexível e a cavidade fluida ocasionando ondas acústica e vibratórias estruturais acopladas. Para investigar esses fenômenos utilizou-se modelo experimental simplificado que consiste em uma cavidade rígida de madeira acoplada à uma placa flexível de alumínio estudada por técnicas experimental, analítica e numérica. Contudo, a identificação experimental da dinâmica da placa flexível acoplada a cavidade acústica não tinha sido realizada. O presente trabalho realiza a identificação modal de uma placa flexível de alumínio, acoplada a uma cavidade acústica rígida com o intuito de entender o comportamento do sistema acoplado, validar e comparar os resultados obtidos pelos métodos numéricos e experimentais. Uma fonte sonora calibrada é utilizada para excitar o sistema acoplado placa mais cavidade acústica. E um vibrometro laser para efetuar a medição dinâmica da placa. Por fim, este trabalho compara e valida os resultados experimentais com relação aos resultados anteriores numéricos, analíticos e experimentais para cavidades vibroacústicas além de considerar resultados da literatura.
The study of vibroacoustics (a area of fluid-structure interaction) has importance in many branches of engineering, such as civil, mechanical, aeronautical, naval, bioengineering and nuclear. A source of cavity noise occurs through the interaction between the flexible structure and the fluid cavity causing acoustic waves and coupled structural vibrations. To investigate these phenomena was used a simplified experimental model consisting of a rigid wooden cavity coupled to a flexible aluminum plate studied by experimental, analytical and numerical techniques. However, the experimental identification of the dynamics of the flexible plate coupled to acoustic cavity had not been performed. The present work presents the modal identification of a flexible aluminum plate coupled to a rigid acoustic cavity in order to understand the behavior of the coupled system, validate and compare the results obtained by numerical and experimental methods. A calibrated sound source is used to excite the system coupled plate plus acoustic cavity. A laser vibrometer is used to perform the dynamic measurement of the plate. Finally, this work compares and validates the experimental results in relation to previous numerical, analytical and experimental results for vibroacoustic cavities in addition to considering results from the literature.

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Eriksson, Anna. "Mating disruption in Scaphoideus titanus Ball (Hemiptera: Cicadellidae) by vibrational signals." Doctoral thesis, country:IT, 2013. http://hdl.handle.net/10449/23857.

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Анотація:

Conventional pesticides have detrimental effects on the global health and a development of environmentally friendly alternatives to control agricultural pests is essential. Mating disruption is an example of such method, since it exploits the natural airborne pheromone plumes that females emit to attract males. When a synthetic pheromone is applied to a field, males are disorientated and mating is prevented in the treated area. However, not all insect species communicate with olfactory signals. It has been estimated that 150 000 species use vibrations to achieve mating and among them there are several pests and important vectors of plant diseases. To control such species, growers may need to apply large amounts of pesticides, which is both environmentally and economically costly. The main goal of the present thesis was therefore to develop a vibrational mating disruption strategy. For this, the leafhopper Scaphoideus titanus was chosen as model species, since it uses vibrations both for mating and rivalry, along with being an economically important vector of the severe phytoplasma grapevine disease Flavescence doreé. Besides experiments concerning the proper mating disruption, laboratorial studies were made on signal transmission through grapevine tissues and on the ability of males and females to emit and receive substrate-borne signals. For the first time, it was shown that substrate-borne vibrational signals can allow communication between individuals despite lack of substrate continuity. This is an important contribution for an improved knowledge of the subject, but also to consider for control of insects that are distributed on closely adjacent plants like grapevine. Moreover, it was shown that males 3 are able to make directional decisions towards females and that there is an increased level of female signal intensity that triggers the male to initiate courtship. Pair formation in S. titanus starts with identification and proceeds with a location (search) stage before the final courtship. In the identification duets, male pulses were delayed after female reply, while they were fully synchronized during location and courtship duets. It is possible that mating disruption with vibrations is more successfully applied during the identification stage when external interferences could result in loss of important information that is needed to correctly identify the mating partner. Finally, during the mating disruption experiments, a pre-recorded natural rivalry signal of S. titanus was used for disruption when transmitted via grapevine wires to plants, where it masked the communication between males and females. In both semi-field and field experiments, the number of mated females was significantly reduced in presence of disruptive signal while females were mated in the silent control plants. These results suggest that vibrational mating disruption may have an important impact on future integrated pest managements of agricultural productions. Moreover, it is possible that the method can be applied to control different vibrational communicating pests. Vibrating plants in greenhouses may be easier than in an open field due to the protected environment and presence of energetic source. Yet, although the results from this thesis have shown that the principle of the method is promising, a future goal will first be to optimize the energetic and economic expenses of the system.

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Acharya, Dabit. "COMPARATIVE EXPERIMENTAL STUDIES FOR GLOBAL DAMAGE DETECTION IN PLATES USING THE SCANNING LASER VIBROMETER TECHNIQUES." University of Akron / OhioLINK, 2006. http://rave.ohiolink.edu/etdc/view?acc_num=akron1155079600.

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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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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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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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Olsson, Erik. "Sound source localization from laser vibrometry recordings." Doctoral thesis, Luleå : Division of experimental mechanics, Luleå University of Technology, 2007. http://epubl.ltu.se/1402-1544/2007/23/.

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Tirabassi, Mario. "Uncertainty due to misalignment in Laser Vibrometry." Thesis, Loughborough University, 2011. https://dspace.lboro.ac.uk/2134/8579.

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Анотація:

Laser Doppler Vibrometry (LDV) is a well established technique used for non intrusive velocity measurements in fluid flows and on solid surfaces. Unlike traditional contacting vibration transducers, laser vibrometers require no physical contact with the test object. The ability to combine advanced mirror systems together with the laser source allows automated scanning LDV (SLDV) measurements, where a high number of measurement points can be measured consecutively. Non-contact vibration measurements with very high spatial resolution are possible with such a scanning system and can lead to a significantly more detailed analysis from vibration tests. One of the main limitations of Laser Vibrometry is the difficulty to realize a perfect alignment between the investigated target and the laser beam. Frequently, for engineering applications, it is desirable to investigate different points on a target using the LDV system and, in this case, accurate knowledge of the measuring point position is required. Misalignments associated with the laser beam or the optics used to deflect the beam introduce deviation from the desired position and uncertainties in the measured velocity. All optical configurations are sensitive to misalignments, especially scanning systems able to move the laser beam around static or rotating targets. This thesis describes advances in the application and interpretation of such measurements using Laser Vibrometry and concentrates on the analysis of the uncertainties due to the inevitable misalignments between the laser beam and the investigated target in vibration measurements on rotating components. The work is divided into three main sections. The first part proposes a novel method to model any kind of LDV optical arrangement suitable for vibration measurements. This model has been developed with scanning LDV systems in mind but it can be used for any optical configuration. The method is based on a vector approach and integrates directly with the Velocity Sensitivity Model to determine the velocity measured by a single incident beam. The resulting mathematical models describe completely the beam path, the scan pattern and the measured velocity in the presence/absence of target vibrations and misalignments without any kind of approximation. The mathematical expressions derived are complex but easily implemented in software such as Matlab. The models are an important tool for LDV because they help the user to have a better understanding of measured data and to make the best alignment possible. The second part of the thesis concentrates on the modelling of different optical systems using the new method. Different systems from the simplest to the most complex have been analysed using the method. For some arrangements, mathematical models have been formulated for the first time such as for the newly proposed single and dual wedge SLDV systems and for the recently introduced Dove prism SLDV system. These systems are compared to the dual mirror SLDV system. In particular, for the single and the dual wedge SLDV systems, experimental tests have been performed to validate theoretical predictions. The results confirm the validity of the models and show the potential of these systems. Established systems such as the dual mirror and the self-tracking SLDV systems, for which generally less comprehensive models can be found in literature, have been re-analysed with the new method and theoretical predictions have been compared to the data from literature in order to confirm the validity of the new models and also to investigate for the first time some details that have previously been neglected. The models enable identification of the main characteristics of any arrangement, in particular the sensitivity to typical misalignments and target vibration components. For tracking applications on rotating targets, the presence of misalignments causes measured velocities at DC and the first target rotation harmonic whose values depend on how the misalignments combine. The analysis of misalignment effects enables identification of the optical device(s) with the most critical alignment and supplies an initial estimation of the level of uncertainty affecting typical, practical applications. Investigation shows as the self-tracking scanning systems are much sensitive to misalignments and target vibrations than the other scanning systems. The third part of the thesis concentrates on effects on radial and pitch/yaw vibration measurements on rotating targets of both misalignments and surface roughness of the test rotor. It is known that radial and pitch/yaw vibrations taken directly from a rotor using LDV are affected by a cross-sensitivity to the orthogonal vibration component. Resolution of the individual radial or pitch and yaw components is possible via a particular arrangement of the laser beams and using a dedicated resolution algorithm. Error sources such as instrument misalignments, rotation speed measurement error and introduce uncertainties in the resolution algorithm output. Research has quantified these uncertainties when radial vibrations with different or equal amplitude are applied to the target. Particular attention has been given to the effects that surface roughness has on the cross-sensitivity encountered in these measurements. From the tests, it is possible to identify three different ranges of surface roughness. For very smooth circular rotors, the cross-sensitivities are negligible and measurements can be made directly on the rotor without the need for a resolution algorithm. For very rough surfaces including surfaces coated in retro-reflective tape, the measurements have to be resolved to remove the cross-sensitivity. For surface roughnesses between the very smooth and the very rough, reliable measurements cannot be made because levels of the cross-sensitivity cannot be predicted making correct resolution impossible. The significant developments in the use of Laser Vibrometry for different optical configurations and quantification of the uncertainties expected for typical applications on rotating components realised during this research project make this work a practical and important tool for the user.

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Chan, Alfred. "Vocal fold vibration measurements using laser Doppler vibrometry." Thesis, McGill University, 2012. http://digitool.Library.McGill.CA:80/R/?func=dbin-jump-full&object_id=106574.

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Анотація:

The objective of this study was to measure the velocity of the superior surface of human vocal folds during phonation using laser Doppler vibrometry (LDV). A custom-made endoscopic laser beam deflection unit was designed and fabricated. An in vivo clinical experimental procedure was developed and performed at the Montreal General Hospital Voice Laboratory in order to simultaneously collect velocity data from the LDV and video from endoscopy. The velocity along the direction of the laser beam, ie. the inferior-superior direction, was captured and found to be synchronous with electroglottograph (EGG) and sound level meter data. Recorded phonation onset/offset times were found to be commensurate with reported data obtained using EGG and high-speed imaging. The vibration energy of the vocal folds was determined to be significant up to a frequency of 3 kHz. The velocity amplitude was found to be approximately 45 mm/s and was consistent between subjects. A sparse map of the vocal fold surface velocity was obtained, which showed that the velocity amplitude did not change significantly with location. Different characteristic vibration waveforms were identified and attributed to the presence of a mucosal wave over the vocal fold surface. Laser Doppler vibrometry offers potential as a diagnostic tool for the early detection of vocal disorders. It may provide online biofeedback for voice professionals, and help them to tune their laryngeal tension to obtain the desired voice output.
La présente étude avait pour but de mesurer directement la vitesse des cordes vocales de la voix humaine en utilisant la vibrométrie laser (VL). Une buse endoscopique pour la re-direction du faisceau laser a été conçue et construite. Un protocole expérimental de mesures en clinique a été développé et mis en oeuvre afin d'obtenir des signaux de vitesse simultanément avec des images vidéoendoscopiques. Les mesures furent prises au laboratoire de la voix de l'Hôpital Général de Montréal. La vitesse mesurée est dans l'axe du faisceau laser, soit dans la direction inférieure-supérieure. Des signaux synchrones provenant d'un électroglottogramme (EGG) et d'un microphone furent recueillis pour fins de comparaisons et de vérifications. Les signaux provenant du VL sont parfaitement corrélés et consistants avec les signaux du EGG et microphone ainsi que les informations provenant du vidéo. L'énergie vibratoire semble être présente dans un bande de fréquence allant jusqu'à 3 kHz. La vitesse est de 45 mm/s dans les trois cas étudiés, pour toute fréquence, amplitude et position. Différents modes vibratoires avec des formes d'ondes distinctes furent identifiés, probablement dus à la propagation d'ondes sur la surface supérieure des cordes vocales. Les résultats suggèrent que l'utilisation du VL pourrait mener à des applications intéressantes pour la détection de problèmes tels que des lésions. La VL pourrait aussi sans doute fournir une rétroaction à des professionnels de la voix qui leur permettrait d'ajuster la tension et la position de leur cordes vocales afin d'obtenir le timbre ou l'intonation désirée.

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Martin, Peter. "Uncertainty due to speckle noise in laser vibrometry." Thesis, Loughborough University, 2010. https://dspace.lboro.ac.uk/2134/7139.

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This thesis presents fundamental research in the field of laser vibrometry for the application to vibration measurements. A key concern for laser vibrometry is the effect of laser speckle which appears when a coherent laser beam scatters from an optically rough surface. The laser vibrometer is sensitive to changes in laser speckle which result from surface motions not in the direction of the incident beam. This adds speckle noise to the vibrometer output which can be indistinguishable from the genuine surface vibrations. This has been termed ‘pseudo-vibration' and requires careful data interpretation by the vibration engineer. This research has discovered that measurements from smooth surfaces, even when no identifiable speckle pattern is generated, can produce noise and therefore reference to speckle noise, in such circumstances, is inappropriate. This thesis has, therefore, adopted the more general term of pseudo-vibration to include noise generated from any surface roughness or treatment, i.e. including but not limited to speckle noise. This thesis develops and implements novel experimental methods to quantify pseudovibration sensitivities (transverse, tilt and rotation sensitivity) with attention focussed on commercially available laser vibrometers and consideration is given to a range of surface roughnesses and treatments. It investigates, experimentally, the fundamental behaviour of speckles and attempts to formulate, for the first time, a relationship between changes in intensity to pseudo-vibration sensitivity levels. The thesis also develops and implements models for computational simulation of pseudo-vibrations using the fundamental behaviour of speckles. The combination of experimentation and simulation improves current understanding of the pseudo-vibration mechanisms and provides the vibration engineer with a valuable resource to improve data interpretation. Two experimental methods of quantifying pseudo-vibration sensitivity are developed and successfully applied in the evaluation of transverse, tilt and rotation sensitivity for two models of commercial laser vibrometer. These evaluations cover both single beam (translational vibration measurement) and parallel beam (for angular vibration measurement) modes. The first method presented requires correction of the vibrometer measurement with an independent measurement of genuine velocity to produce an iii apparent velocity dominated by the required noise components. The second method requires a differential measurement using two vibrometers to cancel common components such as genuine velocity, leaving only uncorrelated noise from each measurement in the resulting apparent velocity. In each case, a third measurement is required of the surface motion component causing pseudo-vibration and this is used to normalise the apparent velocity. Pseudo-vibration sensitivity is then presented as a map showing the spectral shape of the noise, as a mean and standard deviation of harmonic peaks in the map and as a total rms level across a defined bandwidth. The simulations employ a novel and effective approach to modelling speckle evolution. Transverse and tilt sensitivity are predicted for the first time and are verified by the experimental study. They provide the vibration engineer with the potential to estimate pseudo-vibrations using a simple piece of software. The laser beam spot diameter has a large influence on the pseudo-vibration sensitivity. Transverse sensitivity has been quantified as around 0.03% and 0.01% (per order) of the transverse velocity of the surface for beam spot diameters of 100 μm and 600 μm respectively. Larger beam spots have been shown to significantly reduce transverse sensitivity and measurements from smoother surfaces have also shown a reduced level of transverse sensitivity. Tilt sensitivity has been quantified at about 0.1 μms-1/degs-1 and 0.3 μms-1/degs-1 (per order) of angular velocity of the surface for beam spot diameters of 100 μm and 600 μm respectively. Smaller beam spot diameters significantly reduce tilt sensitivity. The surface roughness or treatment has been shown to have little effect on the level of tilt sensitivity. Rotation sensitivity has been quantified at approximately 0.6 μms- 1/rads-1 and 1.9μms-1/rads-1 (per order) of rotation velocity of the rotor for 90 μm and 520 μm. Smaller beam spot diameters have shown a significant reduction in rotation sensitivity and measurements on smoother surfaces have shown a reduced rotation sensitivity. Focussing the laser beam approximately on the rotation axis has also shown a significant reduction in rotation sensitivity. Parallel beam rotation sensitivity has been quantified at 0.016 degs-1/rads-1 and it is demonstrated that this can adequately be estimated using the single beam rotation sensitivity.

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Jackson, Stephen. "Proposed pixel for custom laser Doppler vibrometry camera." Thesis, University of Nottingham, 2012. http://eprints.nottingham.ac.uk/12975/.

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Non-destructive testing is an important field of research in many areas of industry and science. This field covers methods that test some property of an object while not impacting its future usefulness. This project is specifically interested in a method of NDE called Laser Doppler Vibrometry (LDV), which uses light to probe the motion of an object's surface. This thesis presents research into the possibility of developing a full-field LDV camera capable of measuring the vibration at a number of points across an object simultaneously. The approach chosen was to develop a single processing element which contained a light detector as well as the processing required to produce an output signal proportional to the vibration of the surface imaged by the element. This processing element, or pixel, could then be used to produce a full-field LDV camera capable of imaging an object's surface to provide vibration amplitude and frequency for a number of points across the whole surface simultaneously Some early work was carried out measuring the vibration of a piezoelectric target with a CMOS camera and the results were compared with theory. The method of processing chosen is called zero-crossing demodulation and a circuit was designed and simulated using this method. This circuit was then laid-out and a CMOS chip was fabricated with the pixel on it. The circuit was designed such that the different parts of it could be tested separately using electrical signals, and a number of electrical tests were performed to check how well the operation of the fabricated pixel compared with simulation. Using a laser interferometer the pixel was finally tested with real vibrating objects and compared with a commercial LDV.

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Книги з теми "Laser vibrometro"

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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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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Di Maio, Dario, ed. Rotating Machinery, Vibro-Acoustics & Laser Vibrometry, Volume 7. Cham: Springer International Publishing, 2019. http://dx.doi.org/10.1007/978-3-319-74693-7.

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De Clerck, James, and David S. Epp, eds. Rotating Machinery, Hybrid Test Methods, Vibro-Acoustics & Laser Vibrometry, Volume 8. Cham: Springer International Publishing, 2016. http://dx.doi.org/10.1007/978-3-319-30084-9.

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Di Maio, Dario, and Paolo Castellini, eds. Rotating Machinery, Hybrid Test Methods, Vibro-Acoustics & Laser Vibrometry, Volume 8. Cham: Springer International Publishing, 2017. http://dx.doi.org/10.1007/978-3-319-54648-3.

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Rizzi, Stephen A. VPI: Vibration Pattern Imager: A control and data acquisition system for scanning laser vibrometers. Hampton, Va: National Aeronautics and Space Administration, Langley Research Center, 1993.

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

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

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

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Clerck, James De, and David S. Epp. Rotating Machinery, Hybrid Test Methods, Vibro-Acoustics and Laser Vibrometry, Volume 8: Proceedings of the 34th IMAC, a Conference and Exposition on Structural Dynamics 2016. Springer London, Limited, 2016.

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Частини книг з теми "Laser vibrometro"

Halliwell, N. A. "Laser vibrometry." In Optical Methods in Engineering Metrology, 179–211. Dordrecht: Springer Netherlands, 1993. http://dx.doi.org/10.1007/978-94-011-1564-3_6.

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Halliwell, Neil A. "Laser Vibrometers." In Handbook of Laser Technology and Applications, 43–59. 2nd ed. 2nd edition. | Boca Raton : CRC Press, 2021– |: CRC Press, 2021. http://dx.doi.org/10.1201/9781003130123-4.

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Castellini, Paolo, Enrico Esposito, Nicola Paone, and Lorenzo Scalise. "Theory of Vibrometry." In Laser Doppler Vibrometry, 19–53. Berlin, Heidelberg: Springer Berlin Heidelberg, 2020. http://dx.doi.org/10.1007/978-3-662-61318-4_2.

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Castellini, Paolo, Nicola Paone, and Paolo Pietroni. "Supporting Theory." In Laser Doppler Vibrometry, 1–17. Berlin, Heidelberg: Springer Berlin Heidelberg, 2020. http://dx.doi.org/10.1007/978-3-662-61318-4_1.

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Castellini, Paolo, Milena Martarelli, Nicola Paone, Paolo Pietroni, Gian Marco Revel, and Lorenzo Scalise. "Instrumentation." In Laser Doppler Vibrometry, 55–162. Berlin, Heidelberg: Springer Berlin Heidelberg, 2020. http://dx.doi.org/10.1007/978-3-662-61318-4_3.

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Cardarelli, Aldo, Paolo Castellini, Enrico Esposito, Barbara Marchetti, Milena Martarelli, Nicola Paone, Paolo Pietroni, et al. "Multimedia Content." In Laser Doppler Vibrometry, 163–64. Berlin, Heidelberg: Springer Berlin Heidelberg, 2020. http://dx.doi.org/10.1007/978-3-662-61318-4_4.

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Feser, Martin. "Scanning Laser Vibrometer." In Laser in der Technik / Laser in Engineering, 296–98. Berlin, Heidelberg: Springer Berlin Heidelberg, 1994. http://dx.doi.org/10.1007/978-3-662-08251-5_68.

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Rembe, Christian, and Laura Mignanelli. "Introduction to Laser-Doppler Vibrometry." In Bioanalysis, 9–21. Cham: Springer International Publishing, 2020. http://dx.doi.org/10.1007/978-3-030-46691-6_2.

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Halliwell, N. A., S. A. Kember, and S. J. Rothberg. "Laser vibrometry for impact measurements." In Dynamics of Vibro-Impact Systems, 279–88. Berlin, Heidelberg: Springer Berlin Heidelberg, 1999. http://dx.doi.org/10.1007/978-3-642-60114-9_31.

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Selbach, Helmut, and Andreas Lewin. "Differentielles fiberoptisches Laser Doppler Vibrometer zur Schwingungsanalyse." In Laser/Optoelektronik in der Technik / Laser/Optoelectronics in Engineering, 254–59. Berlin, Heidelberg: Springer Berlin Heidelberg, 1987. http://dx.doi.org/10.1007/978-3-642-83174-4_56.

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Тези доповідей конференцій з теми "Laser vibrometro"

Rothberg, Steven J., and Neil A. Halliwell. "Application of Laser Vibrometry to Vibration Measurement on Rotating Components." In ASME 1995 Design Engineering Technical Conferences collocated with the ASME 1995 15th International Computers in Engineering Conference and the ASME 1995 9th Annual Engineering Database Symposium. American Society of Mechanical Engineers, 1995. http://dx.doi.org/10.1115/detc1995-0720.

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Abstract This paper describes the application of Laser Doppler Vibrometry to vibration measurements on rotating targets. The noise generating mechanism of the laser speckle phenomenon is first explained before confirmation of the insensitivity of measurements to target shape. The principal focus of the paper is on the fundamental limitation associated with the use of Laser Vibrometers for radial vibration measurements directly on rotating components. In such measurements significant cross-sensitivities to speed fluctuations, including torsional vibrations, and in-plane vibrations are evident, preventing synchronous vibration analysis. Mathematical and electronic means to resolve the correct orthogonal vibration components are presented and shown to be successful in enabling the use of Laser Vibrometry for non-synchronous vibration measurements.

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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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Ferrari, Giovanni, Marco Amabili, and Prabakaran Balasubramanian. "Nonlinear Damping on Large-Amplitude Vibrations of Plates." In ASME 2015 International Mechanical Engineering Congress and Exposition. American Society of Mechanical Engineers, 2015. http://dx.doi.org/10.1115/imece2015-50951.

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Large-amplitude (geometrically nonlinear) forced vibrations of completely free sandwich and steel rectangular plates are investigated experimentally. Harmonic excitation is applied by using an electro-dynamic exciter and the plate vibration is measured by using laser Doppler vibrometers. A scanning laser Doppler vibrometer is used for experimental modal analysis since it provides non-contact vibration measurements with very high spatial resolution. The large-amplitude vibration experiments are carried out by using a single point Laser Doppler Vibrometer and a stepped-sine testing procedure. The non-linear frequency response curves are obtained by increasing and decreasing the excitation frequency in very small steps at specific force amplitudes controlled in a closed-loop. The experimental results are compared to numerical simulations obtained by reduced-order models and show very good agreement. The nonlinear damping is experimentally obtained as a function of the vibration amplitude.

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Ngoi, B. K. A., and K. Venkatakrishnan. "A Novel Technique for Measurement of Vibration Using Acousto Optic Modulator (AOM)." In ASME 1998 International Mechanical Engineering Congress and Exposition. American Society of Mechanical Engineers, 1998. http://dx.doi.org/10.1115/imece1998-0559.

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Abstract A novel method for the measurement of vibration using an acousto optic modulator (AOM) is described. Previous methods generally rely on holographic (off-line measurement) and laser Doppler vibrometers (on line measurement). This method shows a new direction of vibration measurement using AOM rather than relying on laser Doppler vibrometer and laser Doppler displacement meter for on-line vibration measurement. A method of obtaining resolution in the range of sub-nanometer is proposed. The technique proposed not only projects a novel technique but also brings to light the possible application of AOM.

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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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Abramski, Krzysztof M., P. R. Kaczmarek, T. J. Rogowski, and Arkadiusz J. Antonczak. "Heterodyne laser vibrometry." In 4th International Conference on Vibration Measurement by Laser Techniques, edited by Enrico P. Tomasini. SPIE, 2000. http://dx.doi.org/10.1117/12.386715.

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Peterleithner, Johannes, Andreas Marn, and Jakob Woisetschläger. "Interferometric Investigation of the Thermoacoustics in a Swirl Stabilized Methane Flame." In ASME Turbo Expo 2015: Turbine Technical Conference and Exposition. American Society of Mechanical Engineers, 2015. http://dx.doi.org/10.1115/gt2015-42743.

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In this work, an atmospheric model combustion chamber was characterized employing Laser Vibrometry, chemiluminescence and Particle Image Velocimetry. The test object was a variable geometry burner enclosed with a liner, with the flame optically accessible through four fused silica windows. In this burner with adjustable flame conditions the cavity of the atmospheric model combustion chamber was excited at a frequency around 200Hz. Resonant and non-resonant flame conditions were investigated and compared by laser vibrometer interferometry, schlieren visualization and OH*/CH* chemiluminescence. Additionally, the velocity field was recorded with Particle Image Velocimetry, while the aerodynamics of the burner plenum was analyzed with Computational Fluid Dynamics.

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Rothberg, Steve J., and Benjamin J. Halkon. "Laser vibrometry meets laser speckle." In Sixth International Conference on Vibration Measurements by Laser Techniques: Advances and Applications. SPIE, 2004. http://dx.doi.org/10.1117/12.579760.

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Letalick, Dietmar, Christer Karlsson, and Ingmar Renhorn. "Coherent laser radar for vibrometry." In Coherent Laser Radar. Washington, D.C.: Optica Publishing Group, 1995. http://dx.doi.org/10.1364/clr.1995.tha4.

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Coherent laser radar (CLR) systems have been investigated over several decades primarily for military applications. Depending on the application, several design parameters, e.g. the choice of system technology and wavelength, have to be considered. A short wavelength system can give advantages in robustness and size whereas a long wavelength system can give advantages in a lower attenuation by aerosols, which results in a longer range. Applications for a multi-purpose system a CO2-ladar include, e.g., range finding, vibrometry, and 3-D imaging. A CLR system is very useful for remote sensing of vibrational and rotational characteristics of surfaces and objects. Such information can be used in e.g. inspection and maintenance of helicopters and aircraft, and also for platform identification.

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Rembe, Christian, Lisa Kadner, and Moritz Giesen. "Approaching attometer laser vibrometry." In 11TH INTERNATIONAL CONFERENCE ON VIBRATION MEASUREMENTS BY LASER AND NONCONTACT TECHNIQUES - AIVELA 2014: Advances and Applications. AIP Publishing LLC, 2014. http://dx.doi.org/10.1063/1.4879576.

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Звіти організацій з теми "Laser vibrometro"

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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Saric, William S. Scanning Laser Vibrometer for MEMS Control Devices. Fort Belvoir, VA: Defense Technical Information Center, March 2000. http://dx.doi.org/10.21236/ada375480.

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Corey, Jordan. Under-sampling in a Multiple-Channel Laser Vibrometry System. Office of Scientific and Technical Information (OSTI), March 2007. http://dx.doi.org/10.2172/902375.

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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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Hernandez, Carlos A. Anomaly Detection In Additively Manufactured Parts Using Laser Doppler Vibrometery. Office of Scientific and Technical Information (OSTI), September 2015. http://dx.doi.org/10.2172/1226932.

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Virgin, L. W. Acquisition of a Point-to-Point Laser Doppler Vibrometer Measurement System. Fort Belvoir, VA: Defense Technical Information Center, February 2002. http://dx.doi.org/10.21236/ada407884.

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Schulz, Mark J., and P. F. Pai. New Techniques in Experimental Structural Dynamics Using a Scanning Laser Vibrometer. Fort Belvoir, VA: Defense Technical Information Center, June 1998. http://dx.doi.org/10.21236/ada350957.

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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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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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