Vibration Measurement by Speckle Interferometry between High Spatial and High Temporal Resolution

Nicolae, Dan

doi:10.5772/13825

Cited by 2 publications

(2 citation statements)

References 25 publications

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“…Figure 1(a) shows (in false colors) the simulated values of φ A representing a typical mode shape on a rectangular plate clamped on its bottom border. (4) to (6). (3) using a uniform reference beam, a speckled object beam and the φ A profile.…”

Section: Principle Of Phase-stepping Time-averagedmentioning

confidence: 99%

“…The object beam results from the illumination of the studied object by a laser; the reference beam comes from the same laser but is directly sent to the recording device. [3][4][5][6] The best known is the time-averaging (TA) in which specklegrams or shearograms are recorded over an integration time much longer than the object vibration period. In shearography, no reference beam is used.…”

Section: Introductionmentioning

confidence: 99%

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Vibration mode shapes visualization in industrial environment by real-time time-averaged phase-stepped electronic speckle pattern interferometry at 10.6 μ m and shearography at 532 nm

et al. 2016

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We present our investigations on two interferometric methods suitable for industrial conditions dedicated to the visualization of vibration modes of aeronautic blades. First, we consider long-wave infrared (LWIR) electronic speckle pattern interferometry (ESPI). The use of long wavelength allows measuring larger amplitudes of vibrations compared with what can be achieved with visible light. Also longer wavelengths allow lower sensitivity to external perturbations. Second, shearography at 532 nm is used as an alternative to LWIR ESPI. Both methods are used in time-averaged mode with the use of phase-stepping. This allows transforming Bessel fringes, typical to time averaging, into phase values that provide higher contrast and improve the visualization of vibration mode shapes. Laboratory experimental results with both techniques allowed comparison of techniques, leading to selection of shearography. Finally a vibration test on electrodynamic shaker is performed in an industrial environment and mode shapes are obtained with good quality by shearography. Downloaded From: http://opticalengineering.spiedigitallibrary.org/ on 06/05/2016 Terms of Use: http://spiedigitallibrary.org/ss/TermsOfUse.aspx

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Section: Principle Of Phase-stepping Time-averagedmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Vibration mode shapes visualization in industrial environment by real-time time-averaged phase-stepped electronic speckle pattern interferometry at 10.6 μ m and shearography at 532 nm

et al. 2016

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Biologically Compatible Lead-Free Piezoelectric Composite for Acoustophoresis Based Particle Manipulation Techniques

Janušas

Urbaite

Palevičius

et al. 2021

Sensors

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This research paper is concentrated on the design of biologically compatible lead-free piezoelectric composites which may eventually replace traditional lead zirconium titanate (PZT) in micromechanical fluidics, the predominantly used ferroelectric material today. Thus, a lead-free barium–calcium zirconate titanate (BCZT) composite was synthesized, its crystalline structure and size, surface morphology, chemical, and piezoelectric properties were analyzed, together with the investigations done in variation of composite thin film thickness and its effect on the element properties. Four elements with different thicknesses of BCZT layers were fabricated and investigated in order to design a functional acoustophoresis micromechanical fluidic element, based on bulk acoustic generation for particle control technologies. Main methods used in this research were as follows: FTIR and XRD for evaluation of chemical and phase composition; SEM—for surface morphology; wettability measurements were used for surface free energy evaluation; a laser triangular sensing system—for evaluation of piezoelectric properties. XRD results allowed calculating the average crystallite size, which was 65.68 Å3 confirming the formation of BCZT nanoparticles. SEM micrographs results showed that BCZT thin films have some porosities on the surface with grain size ranging from 0.2 to 7.2 µm. Measurements of wettability showed that thin film surfaces are partially wetting and hydrophilic, with high degree of wettability and strong solid/liquid interactions for liquids. The critical surface tension was calculated in the range from 20.05 to 27.20 mN/m. Finally, investigations of piezoelectric properties showed significant results of lead-free piezoelectric composite, i.e., under 5 N force impulse thin films generated from 76 mV up to 782 mV voltages. Moreover, an experimental analysis showed that a designed lead-free BCZT element creates bulk acoustic waves and allows manipulating bio particles in this fluidic system.

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Vibration Measurement by Speckle Interferometry between High Spatial and High Temporal Resolution

Cited by 2 publications

References 25 publications

Vibration mode shapes visualization in industrial environment by real-time time-averaged phase-stepped electronic speckle pattern interferometry at 10.6 μ m and shearography at 532 nm

Vibration mode shapes visualization in industrial environment by real-time time-averaged phase-stepped electronic speckle pattern interferometry at 10.6 μ m and shearography at 532 nm

Biologically Compatible Lead-Free Piezoelectric Composite for Acoustophoresis Based Particle Manipulation Techniques

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