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Articles de revues sur le sujet « Laser vibrometro »

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Auteur : Grafiati
Publié le 11 mars 2023

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1

Adamczak, Stanisław, Mateusz Wrzochal et Numan Durakbasa. « Evaluation of a non-contact method for measuring vibration of rolling bearings in industrial conditions ». Mechanik 93, no 2 (14 février 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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2

Breaban, Florin, Roger Debuchy et Didier Defer. « Laser Scanning Vibrometry and Holographic Interferometry Applied to Vibration Study ». Applied Mechanics and Materials 801 (octobre 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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3

He, Wen, Guanhua Xu, Zuochao Rong, Gen Li et Min Liu. « Automatic Calibration System for Digital-Display Vibrometers Based on Machine Vision ». Metrology and Measurement Systems 21, no 2 (1 juin 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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4

Szeleziński, Adam, Adam Muc, Lech Murawski, Marcin Kluczyk et Tomasz Muchowski. « Application of Laser Vibrometry to Assess Defects in Ship Hull’s Welded Joints’ Technical Condition ». Sensors 21, no 3 (29 janvier 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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5

McDevitt, T. E., G. H. Koopmann et C. B. Burroughs. « Two-Channel Laser Vibrometer Techniques for Vibrational Intensity Measurements : Part 2—Longitudinal Intensity ». Journal of Vibration and Acoustics 116, no 1 (1 janvier 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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6

Orta, Adil Han, Mathias Kersemans et Koen Van Den Abeele. « On the Identification of Orthotropic Elastic Stiffness Using 3D Guided Wavefield Data ». Sensors 22, no 14 (15 juillet 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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7

Schewe, M., M. A. A. Ismail et 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 (1 mai 2021) : 280–82. http://dx.doi.org/10.1784/insi.2021.63.5.280.

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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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8

Rothberg, S. J., et N. A. Halliwell. « Vibration Measurements on Rotating Machinery Using Laser Doppler Velocimetry ». Journal of Vibration and Acoustics 116, no 3 (1 juillet 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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9

Nakagawa, Heisaburo, Yutaka Kurita, Keiji Ogawa, Yuji Sugiyama et Hideyasu Hasegawa. « Experimental Analysis of Chatter Vibration in End-Milling Using Laser Doppler Vibrometers ». International Journal of Automation Technology 2, no 6 (5 novembre 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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10

Kilpatrick, James M., et Vladimir B. Markov. « Full-Field Laser Vibrometer for Instantaneous Vibration Measurement and Non-Destructive Inspection ». Key Engineering Materials 437 (mai 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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11

Oota, Akihiro, Hideaki Nozato, Wataru Kokuyama, Yoshinori Kobayashi, Osamu Takano et Naoki Kasai. « Digital demodulator unit of laser vibrometer standard for in situ measurement ». ACTA IMEKO 2, no 2 (15 janvier 2014) : 61. http://dx.doi.org/10.21014/acta_imeko.v2i2.116.

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To establish an easy-to-use traceability system for laser vibrometers in vibration acceleration standard, a highly accurate reference standard is required. In this study, we investigated the measurement reliability of a commercial laser vibrometer with an analog demodulator. The results confirmed a large measurement deviation from nominal sensitivity values due to characteristics of the analog demodulator. To reduce such deviation, a high-accuracy digital demodulator, which can be utilized as a reference standard, was developed. The experimental results confirmed the improved measurement accuracy of the developed digital demodulator.
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12

Huang, Zhen, Cheng Wei Li, Wu Chang Feng et Mao Yuan Zhu. « Low Cost Vibrometer Utilizing Laser Diode Self-Mixing with Sound Card Controlled by LabVIEW ». Advanced Materials Research 189-193 (février 2011) : 906–10. http://dx.doi.org/10.4028/www.scientific.net/amr.189-193.906.

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A compact and versatile vibrometer is designed based on self-mixing laser diode vibrometry interference to measure the oscillation amplitude of a piezoceramics (PZT). A fraction of the light emitted by the laser diode (LD) is reflected by the PZT, and then mixes with the light inside the cavity, causing a modulation of the laser output. The self-mixing signal is detected by the photodiode accommodated in the LD package and acquired by a data acquisition and processing system based on sound card and LabVIEW. Amplitude of the PZT is detected by fringe counting. According to results of test, this device can measure the vibration signal with a measurement accuracy of λ/2. The measurable oscillation amplitude range from 0.325 um to 6.5um
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13

Dafydd, Ifan, et Zahra Sharif Khodaei. « Laser Vibrometer Imaging of Delamination Interaction with Lamb Waves Using a Chirp Excitation Method ». Key Engineering Materials 754 (septembre 2017) : 375–78. http://dx.doi.org/10.4028/www.scientific.net/kem.754.375.

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One method that has shown great potential in visualising and characterising the interaction of guided waves with damage in composites is Laser Vibrometry. A Laser Doppler Vibrometer (LDV) can be used to produce 2D wavefield images of guided Lamb waves but a single scan is very time consuming and normally multiple scans are required at various frequencies in order to determine the best input signal. This paper demonstrates the use of a chirp excitation method requiring only a single scan and a post-processing algorithm to obtain results corresponding to any narrowband signal within the frequency range of the chirp signal. The method was used on an artificially delaminated composite panel and showed that the S0 mode, dominant at higher frequencies, mainly caused mode conversions whilst the A0 mode, dominant at lower frequencies, mainly caused a change in phase and amplitude across the delaminationOne method that has shown great potential in visualising and characterising the interaction of guided waves with damage in composites is Laser Vibrometry. A Laser Doppler Vibrometer (LDV) can be used to produce 2D wavefield images of guided Lamb waves but a single scan is very time consuming and normally multiple scans are required at various frequencies in order to determine the best input signal. This paper demonstrates the use of a chirp excitation method requiring only a single scan and a post-processing algorithm to obtain results corresponding to any narrowband signal within the frequency range of the chirp signal. The method was used on an artificially delaminated composite panel and showed that the S0 mode, dominant at higher frequencies, mainly caused mode conversions whilst the A0 mode, dominant at lower frequencies, mainly caused a change in phase and amplitude across the delamination.
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14

Haller, Piotr, Antoni Jankowski, Andrzej Kaźmierczak et Radosław Wróbel. « Wavelet Transform in Vibroacoustic Diagnostic of Machines ». Journal of KONES 26, no 1 (1 mars 2019) : 47–55. http://dx.doi.org/10.2478/kones-2019-0006.

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Abstract This article discusses the use of wavelet decomposition in the diagnostics of vibrometric signals of an engine. Apart from presenting the possibility of using wavelets in diagnostics, the authors take up the subject of the applicability range of processing for stationary signals, which until now has been reserved for non-stationary signals. A unified definition of signal stationarity has been proposed, which is not based on statistics. The authors presented methods of wavelet decomposition of a vibrometric signal of combustion engine vibrations, measured with the use of LDV (Laser Doppler Vibrometry). Laser measurements allows for studying an object without ‘touching’ its housing. Basing on the relative velocity of engine vibrations, the authors indicate how reliable vibrations are in diagnostics. Despite higher costs, this measurement method gives better results (for specific cases) than acoustic studies. Transform – wavelet decomposition is a solution hardly ever used in machine diagnostics; it is more often applied in medicine and image recognition. The authors presented the differences that can be obtained for different levels of decomposition, and also presented the impact on the engine condition assessment through the use of filtering (windowing) the signal before decomposition.
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15

Halkon, Ben J., et Steve J. Rothberg. « Rotor Vibration Measurements Using Laser Doppler Vibrometry : Essential Post-Processing for Resolution of Radial and Pitch/Yaw Vibrations ». Journal of Vibration and Acoustics 128, no 1 (7 juillet 2005) : 8–20. http://dx.doi.org/10.1115/1.2149389.

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Laser Doppler vibrometry is now a well established technique enabling noncontact vibration measurements in the most challenging of environments. Rotor vibration measurements are often highlighted as a major application of laser vibrometers due to their noncontact operation and inherent immunity to shaft runout. In such measurements, resolution of the individual axial and torsional vibration components is possible via particular arrangement of the laser beam(s). Resolution of the radial or pitch/yaw vibration components, however, can only be achieved by essential post-processing of the data from simultaneous orthogonal measurements. This paper describes the principle and rigorous examination of a novel, dedicated resolution algorithm enabling, for the first time, real-time post-processing of the outputs from standard commercial instruments. The system performed well, even in the presence of noise and other typical measurement errors, and was implemented successfully in an engine vibration study.
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16

Lu Tongtong, 鹿彤彤, 陆彦婷 LuYanting, 杜福嘉 Du Fujia, 李常伟 Li Changwei, 李顺 Li Shun et 张思炯 Zhang Sijiong. « 瞳面干涉激光多普勒测振 ». Acta Optica Sinica 42, no 15 (2022) : 1512005. http://dx.doi.org/10.3788/aos202242.1512005.

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17

Sotor, Jarosław, Krzysztof Abramski, Arkadiusz Antończak, Grzegorz Sobon, Paweł Kaczmarek, Adam Wąż, Grzegorz Dudzik et al. « Laser and Fiber Electronics Group ». Photonics Letters of Poland 11, no 2 (1 juillet 2019) : 38. http://dx.doi.org/10.4302/plp.v11i2.901.

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The Laser & Fiber Electronics Group (LFEG) constitutes a team of young, skilled and ambitious researchers, doctoral candidates and students. The Group possesses great experience in applied optoelectronics and laser technology. Currently, it conducts research in several areas,mostly focusing on: ultrashort laser pulse generation using novel materials, development of pulsed fiber laser sources ranging from visible to mid-infrared, development of compact mid-infrared optical frequency combs, laser spectroscopy techniques, laser vibrometry, solid-state lasers, advanced analog and digital electronics, and investigations of light-matter interaction.
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18

Köhnke, Semjon, Malte Ennen et Iwan Schaap. « Confocal Laser Vibrometry ». PhotonicsViews 17, no 4 (août 2020) : 24–27. http://dx.doi.org/10.1002/phvs.202000034.

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19

Wang, Xingwu. « Laser vibrometer ». Journal of the Acoustical Society of America 104, no 6 (décembre 1998) : 3155. http://dx.doi.org/10.1121/1.424245.

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20

Rudd, Michael J. « Laser vibrometer ». Journal of the Acoustical Society of America 80, no 3 (septembre 1986) : 998. http://dx.doi.org/10.1121/1.393828.

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21

Rembe, C., L. Kadner et M. Giesen. « Approaching attometer laser vibrometry ». Review of Scientific Instruments 87, no 10 (octobre 2016) : 102503. http://dx.doi.org/10.1063/1.4964625.

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22

Rothberg, S. J., J. R. Baker et N. A. Halliwell. « Laser vibrometry : Pseudo-vibrations ». Journal of Sound and Vibration 135, no 3 (décembre 1989) : 516–22. http://dx.doi.org/10.1016/0022-460x(89)90705-0.

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23

Hasheminejad, Navid, Cedric Vuye, Wim Van den bergh, Joris Dirckx et Steve Vanlanduit. « A Comparative Study of Laser Doppler Vibrometers for Vibration Measurements on Pavement Materials ». Infrastructures 3, no 4 (1 novembre 2018) : 47. http://dx.doi.org/10.3390/infrastructures3040047.

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A laser Doppler vibrometer (LDV) is a noncontact optical measurement device to measure the vibration velocities of particular points on the surface of an object. Even though LDV has become more popular in road engineering in recent years, their signal-to-noise ratio (SNR) is strongly dependent on light scattering properties of the surface which, in some cases, needs to be properly conditioned. SNR is the main limitation in LDV instrumentation when measuring on low diffusive surfaces like pavements; therefore, an investigation on the SNR of different LDV devices on different surface conditions is of great importance. The objective of this research is to investigate the quality of two types of commercially available LDV systems—helium–neon (He–Ne)-based vibrometers and recently developed infrared vibrometers—on different surface conditions, i.e., retroreflective tape, white tape, black tape, and asphalt concrete. Both noise floor and modal analysis experiments are carried out on these surface conditions. It is shown that the noise floor of the He–Ne LDV is higher when dealing with a noncooperative dark surface, such as asphalt concrete, and it can be improved by improving the surface quality or by using an infrared LDV, which consequently improves the modal analysis experiments performed on pavement materials.
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24

Malinowski, Pawel, Tomasz Wandowski et Wieslaw Ostachowicz. « Characterization of CFRP Using Laser Vibrometry ». Key Engineering Materials 569-570 (juillet 2013) : 710–17. http://dx.doi.org/10.4028/www.scientific.net/kem.569-570.710.

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The investigation was focused on Carbon Fibre Reinforced Polymers (CFRP). In the first part of research the aim was the characterization of CFRP surfaces. These surfaces were influenced by release agent, hydraulic fluid, moisture and overheating. In the second part of research adhesive bond quality was investigated. Three different cases of possible weak bonds were focused on. Weak bond caused by release agent contamination, moisture contamination and poor curing of adhesive. The characterization was conducted using laser vibrometry used as NDT tools. An active element in the form of piezoelectric transducer was used to excite the samples made out of CFRP material. Laser vibroemter was used to register the surface response. Combining the piezoelectric excitation with laser sensing a tool was obtained to measure precisely the propagating elastic waves. The excited waves were measured in defined points by the vibrometer obtaining the wavefield. In order to characterize the surface and bonding quality an indicator was proposed based on propagating wave parameters. The guided elastic wave velocity depends material properties (Young modulus, density, Poisson ratio) and thickness of the sample. It was assumed that comparison of the velocities can provide an information about the bond condition. All the investigated scenarios showed deviation from the reference case.
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Scislo, Lukasz. « Single-Point and Surface Quality Assessment Algorithm in Continuous Production with the Use of 3D Laser Doppler Scanning Vibrometry System ». Sensors 23, no 3 (22 janvier 2023) : 1263. http://dx.doi.org/10.3390/s23031263.

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In the current economic situation of many companies, the need to reduce production time is a critical element. However, this cannot usually be carried out with a decrease in the quality of the final product. This article presents a possible solution for reducing the time needed for quality management. With the use of modern solutions such as optical measurement systems, quality control can be performed without additional stoppage time. In the case of single-point measurement with the Laser Doppler Vibrometer, the measurement can be performed quickly in a matter of milliseconds for each product. This article presents an example of such quality assurance measurements, with the use of fully non-contact methods, together with a proposed evaluation criterion for quality assessment. The proposed quality assurance algorithm allows the comparison of each of the products’ modal responses with the ideal template and stores this information in the cloud, e.g., in the company’s supervisory system. This makes the presented 3D Laser Vibrometry System an advanced instrumentation and data acquisition system which is the perfect application in the case of a factory quality management system based on the Industry 4.0 concept.
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Stulenkov, A. V., P. I. Korotin et A. S. Suvorov. « New Applications of Laser Vibrometry ». Bulletin of the Russian Academy of Sciences : Physics 84, no 6 (juin 2020) : 678–82. http://dx.doi.org/10.3103/s106287382006026x.

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Тарануха, Н. А., et Ко Ко Мин. « Experimental study of vibrations of a steel beam in order to determine the damping coefficients of the material based on the idea of the limit transition using a laser vibrometer ». MORSKIE INTELLEKTUAL`NYE TEHNOLOGII), no 2(52) (20 juin 2021) : 117–22. http://dx.doi.org/10.37220/mit.2021.52.2.061.

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Данная работа посвящена экспериментальным исследованиям консольной балки, разработке методики проведения измерений колебаний в среде на основе измерений в воздухе и жидкости (воде). Измерение амплитудно-частотных характеристик производится с помощью лазерного виброметра: “Polytec High Speed Laser Vibrometer HSV2001, Polytec GmbH, Germany”. Для снятия показаний в экспериментах ис-пользовалась программа «Рolytec vibrometer software» (Polytec High Speed Laser Vibrometer HSV2001, Polytec GmbH, Germany). Обработка экспериментальных данных и построение графиков проводились с помощью программы «Microsoft Excel» с включением в нее фрагментов собственного программного обеспечения. Главной конечной целью является определение коэффициентов демпфирования материала колеблющейся конструкции. При этом используется идея предельного перехода. Методика является оригинальной. Ее оригинальность заключается в использовании новой идеи предельного перехода и выполнении экспериментов на базе виброметра (Polytec High Speed Laser Vibrometer HSV2001). Полученные на основе экспериментальных исследований результаты также являются оригинальными. Методика создана для практического применения и позволяет определять амплитудно-частотные характеристики систем, колеблющихся в различных жидкостях и состоящих из различных материалов. This paper is devoted to experimental studies of the cantilever beam, the development of methods for measuring vibrations in the medium based on measurements in air and liquid (water). The amplitude-frequency characteristics are measured using a laser vibrometer: “Polytec High Speed Laser Vibrometer HSV2001, Polytec GmbH, Germany”. To take readings in the experiments, the program "Polytec vibrometer software" (Polytec High Speed Laser Vibrometer HSV2001, Polytec GmbH, Germany) was used. The processing of experimental data and the construction of graphs were carried out using the Microsoft Excel program with the inclusion of fragments of its own software. The main ultimate goal is to determine the damping coefficients of the material of the oscillating structure. In this case, the idea of a limit transition is used. The technique is original. Its originality lies in the use of a new idea of the limit transition and performing experiments based on a vibrometer (Polytec High Speed Laser Vibrometer HSV2001). The results obtained on the basis of experimental studies are also original. The method is designed for practical application and allows to determine the amplitude-frequency characteristics of systems that oscillate in different fluids and consist of different materials.
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Arruda, José Roberto de França, Sérgio Augusto Vianna do Rio et Luiz Antonio Silva Bernardes Santos. « A Space-Frequency Data Compression Method for Spatially Dense Laser Doppler Vibrometer Measurements ». Shock and Vibration 3, no 2 (1996) : 127–33. http://dx.doi.org/10.1155/1996/395375.

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When spatially dense mobility shapes are measured with scanning laser Doppler vibrometers, it is often impractical to use phase-separation modal parameter estimation methods due to the excessive number of highly coupled modes and to the prohibitive computational cost of processing huge amounts of data. To deal with this problem, a data compression method using Chebychev polynomial approximation in the frequency domain and two-dimensional discrete Fourier series approximation in the spatial domain, is proposed in this article. The proposed space-frequency regressive approach was implemented and verified using a numerical simulation of a free-free-free-free suspended rectangular aluminum plate. To make the simulation more realistic, the mobility shapes were synthesized by modal superposition using mode shapes obtained experimentally with a scanning laser Doppler vibrometer. A reduced and smoothed model, which takes advantage of the sinusoidal spatial pattern of structural mobility shapes and the polynomial frequency-domain pattern of the mobility shapes, is obtained. From the reduced model, smoothed curves with any desired frequency and spatial resolution can he produced whenever necessary. The procedure can he used either to generate nonmodal models or to compress the measured data prior to modal parameter extraction.
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Halliwell, N. A., et P. G. Eastwood. « The laser torsional vibrometer ». Journal of Sound and Vibration 101, no 3 (août 1985) : 446–49. http://dx.doi.org/10.1016/s0022-460x(85)80143-7.

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Kavalir, Tomas, Michal Krizek, Jiri Sika et Vladimir Kindl. « Upgrading of The Single Point Laser Vibrometer into a Laser Scanning Vibrometer ». Communications - Scientific letters of the University of Zilina 20, no 1 (31 mars 2018) : 61–66. http://dx.doi.org/10.26552/com.c.2018.1.61-66.

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Derusova, D. A., et V. P. Vavilov. « RESONANCE ULTRASONIC LASER VIBROMETRY OF MISCELLANEOUS DEFECTS IN GLASS FIBER REINFORCED PLASTIC ». Kontrol'. Diagnostika, no 258 (décembre 2019) : 24–28. http://dx.doi.org/10.14489/td.2019.12.pp.024-028.

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It is demonstrated that, by using the technique of resonance ultrasonic laser vibrometry, the detectability of inserts of different nature strongly depends on an insert material and its location in a test object made of glass fiber reinforced plastic. The best inspection results have been obtained by providing a two-sided access to the test object with further combining results of vibroscanning obtained at different (resonance) frequencies. The most appropriate defects for applying the technique of laser vibrometry are discontinuities, such as voids and delaminations, which significantly change sample local rigidity.
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32

Waz, A. T., P. R. Kaczmarek et K. M. Abramski. « Laser–fibre vibrometry at 1550 nm ». Measurement Science and Technology 20, no 10 (9 septembre 2009) : 105301. http://dx.doi.org/10.1088/0957-0233/20/10/105301.

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33

Aranchuk, Vyacheslav, Ina Aranchuk, Brian Carpenter et Craig J. Hickey. « Laser Doppler multi-beam differential vibrometry ». Journal of the Acoustical Society of America 148, no 4 (octobre 2020) : 2533. http://dx.doi.org/10.1121/1.5147034.

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34

Cooling, Martin P., Victor F. Humphrey, Pete D. Theobald et Stephen P. Robinson. « Transducer characterization by laser Doppler vibrometry. » Journal of the Acoustical Society of America 125, no 4 (avril 2009) : 2557. http://dx.doi.org/10.1121/1.4783677.

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

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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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36

Volkers, H., et Th Bruns. « Laser-Doppler-Vibrometer calibration by laser stimulation ». ACTA IMEKO 9, no 5 (31 décembre 2020) : 357. http://dx.doi.org/10.21014/acta_imeko.v9i5.1000.

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37

Vignola, Joseph, et Brian H. Houston. « The three‐dimensional laser vibrometer ». Journal of the Acoustical Society of America 92, no 4 (octobre 1992) : 2311. http://dx.doi.org/10.1121/1.405079.

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Vignola, Joseph, et Brian H. Houston. « The three‐dimensional laser vibrometer ». Journal of the Acoustical Society of America 94, no 3 (septembre 1993) : 1853. http://dx.doi.org/10.1121/1.407703.

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39

Wilmshurst, T. H., et N. A. Halliwell. « Laser vibrometer speckle-noise cancellation ». Measurement Science and Technology 4, no 4 (1 avril 1993) : 479–87. http://dx.doi.org/10.1088/0957-0233/4/4/008.

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Giuliani, Guido, Simone Bozzi-Pietra et Silvano Donati. « Self-mixing laser diode vibrometer ». Measurement Science and Technology 14, no 1 (21 novembre 2002) : 24–32. http://dx.doi.org/10.1088/0957-0233/14/1/304.

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Rossi, G., R. Marsili, V. Gusella et M. Gioffrè. « Comparison between Accelerometer and Laser Vibrometer to Measure Traffic Excited Vibrations on Bridges ». Shock and Vibration 9, no 1-2 (2002) : 11–18. http://dx.doi.org/10.1155/2002/968509.

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The use of accelerometer based measurement techniques for evaluating bridge forced vibrations or to perform bridge modal analysis is well established. It is well known to all researchers who have experience in vibration measurements that values of acceleration amplitude can be very low at low frequencies and that a limitation to the use of accelerometer can be due to the threshold parameter of this kind of transducer. Under this conditions the measurement of displacement seems more appropriate. On the other hand laser vibrometer systems detect relative displacements as opposed to the absolute measures of accelerometers. Vibrations have been measured simultaneously by a typical accelerometer for civil structures and by a laser vibrometer equipped with a fringe counter board in terms of velocity and displacements. The accelerations calculated from the laser vibrometer signals and the one directly measured by the accelerometer has been compared.
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42

Solodov, Igor, Klaus Pfleiderer et Gerhard Busse. « Laser vibrometry of air-coupled Lamb waves ». Materials Testing 47, no 3 (mars 2005) : 123–28. http://dx.doi.org/10.3139/120.100643.

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CASTELLINI, P., L. SCALISE et E. P. TOMASINI. « Teeth Mobility Measurement : A Laser Vibrometry Approach ». Journal of Clinical Laser Medicine & ; Surgery 16, no 5 (octobre 1998) : 269–72. http://dx.doi.org/10.1089/clm.1998.16.269.

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Reinhardt, A. K., J. R. Kadambi et R. D. Quinn. « Laser Vibrometry Measurements of Rotating Blade Vibrations ». Journal of Engineering for Gas Turbines and Power 117, no 3 (1 juillet 1995) : 484–88. http://dx.doi.org/10.1115/1.2814121.

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One of the most important design factors in modern turbomachinery is the vibration of turbomachinery blading. There is a need for developing an in-service, noncontacting, noninterfering method for the measurement and monitoring of gas turbine, jet engine, and steam turbine blade vibrations and stresses. Such a technique would also be useful for monitoring rotating helicopter blades. In the power generation industry, blade failures can result in millions of dollars of downtime. The measurement of blade vibrations and dynamic stresses is an important guide for preventive maintenance, which can be a major contributor to the availability of steam turbine, gas turbine, and helicopter operations. An experiment is designed to verify the feasibility of such a vibration monitoring system using the reference beam on-axis laser-Doppler technique. The experimental setup consists of two flat, cantilever blades mounted on a hub attached to the shaft of a dc motor. The motor rests on a linear bearing permitting motion only in the direction of the motor shaft. The motor and blade assembly is then excited via an electrodynamic shaker at the first natural frequency of the blades. The resulting blade vibration is then detected using a laser vibrometer. The vibration frequencies and amplitudes of the two rotating blades are successfully measured.
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45

Solodov, Igor, Daniel Döring et Gerd Busse. « Air-coupled laser vibrometry : analysis and applications ». Applied Optics 48, no 7 (31 octobre 2008) : C33. http://dx.doi.org/10.1364/ao.48.000c33.

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Zipser, L., et H. Franke. « Laser-scanning vibrometry for ultrasonic transducer development ». Sensors and Actuators A : Physical 110, no 1-3 (février 2004) : 264–68. http://dx.doi.org/10.1016/j.sna.2003.10.051.

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Aranchuk, Vyacheslav, et James M. Sabatier. « Effects of speckles in laser Doppler vibrometry. » Journal of the Acoustical Society of America 126, no 4 (2009) : 2238. http://dx.doi.org/10.1121/1.3249192.

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Sitnik, L., K. Pentoś, M. Magdziak-Tokłowicz et R. Wrobel. « The Laser Doppler Vibrometry in mechatronics diagnostics ». Archives of Civil and Mechanical Engineering 15, no 4 (septembre 2015) : 962–70. http://dx.doi.org/10.1016/j.acme.2015.04.001.

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Biswas, Abhijit, Tom Weller et Linda P. B. Katehi. « Stress determination of micromembranes using laser vibrometry ». Review of Scientific Instruments 67, no 5 (mai 1996) : 1965–69. http://dx.doi.org/10.1063/1.1146952.

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Jiang, Leaf A., Marius A. Albota, Robert W. Haupt, Justin G. Chen et Richard M. Marino. « Laser vibrometry from a moving ground vehicle ». Applied Optics 50, no 15 (18 mai 2011) : 2263. http://dx.doi.org/10.1364/ao.50.002263.

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