Journal ArticleDOI
Acoustic-Excitation Optical Coherence Vibrometer for Real-Time Microstructure Vibration Measurement and Modal Analysis
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TLDR
An acoustic-excitation optical coherence vibrometer (AE-OCV) is proposed for noncontact microstructure vibration measurement and modal analysis, especially for high-frequency and nanoscale vibration measurements.Abstract:
An acoustic-excitation optical coherence vibrometer (AE-OCV) is proposed for noncontact microstructure vibration measurement and modal analysis. The vibration dynamic parameters of the microstructure can be captured with a subnanometer displacement resolution by the proposed AE-OCV using spectral wavelength calibration algorithm and spectral center correction method. The natural frequency of the microstructure could also be obtained by the developed noncontact AE-OCV system using the swept-frequency acoustic excitation method. Furthermore, a home-made spectrometer based on a high-speed linear camera could provide the system with a frequency measurement range of 0–50 kHz. The developed AE-OCV has an excellent performance in microstructures vibration measurement and modal analysis, especially for high-frequency and nanoscale vibration measurements. It is of great significance to the design of the microelectromechanical system (MEMS), such as the noncontact dynamic measurement of cantilevered beams in atomic force microscopy.read more
Citations
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Journal ArticleDOI
An improved phase generated carrier demodulation scheme for sinusoidal phase-modulating interferometer to detect air-solid interface acoustic waves
TL;DR: In this article, an improved phase generated carrier (PGC) demodulation scheme is proposed to detect acoustic waves at air-solid interface, which is based on a partial-fiber sinusoidal phase-modulating interferometer (SPMI).
Journal ArticleDOI
Scanning Microwave Vibrometer: Full-Field Vibration Measurement via Microwave Sensing With Phase-Encoded Beam Scanning
TL;DR: In this paper , a microwave sensing-based vibration measurement approach with fast phase-encoded synthesis beam scanning was developed, creating a unique scanning microwave vibrometer (SMV), which measured the vibration displacement under the sensing mechanism with coherently synthesized linear frequency-modulated continuous wave (LFMCW) radio signals.
Journal ArticleDOI
Scanning Microwave Vibrometer: Full-Field Vibration Measurement via Microwave Sensing With Phase-Encoded Beam Scanning
TL;DR: In this paper , a microwave sensing-based vibration measurement approach with fast phase-encoded synthesis beam scanning was developed, creating a unique scanning microwave vibrometer (SMV), which measured the vibration displacement under the sensing mechanism with coherently synthesized linear frequency-modulated continuous wave (LFMCW) radio signals.
Journal ArticleDOI
A Modeling Framework to Develop Materials with Improved Noise and Vibration Performance for Electric Vehicles
TL;DR: In this paper , the authors used the microstructure of materials to study their vibration-damping capacity and found that aluminum and aluminum bronze coatings with a higher damping ratio reduced the amplitude of surface velocity due to excitation, particularly at higher frequencies.
References
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Journal ArticleDOI
Atomic force microscope
TL;DR: The atomic force microscope as mentioned in this paper is a combination of the principles of the scanning tunneling microscope and the stylus profilometer, which was proposed as a method to measure forces as small as 10-18 N. As one application for this concept, they introduce a new type of microscope capable of investigating surfaces of insulators on an atomic scale.
Journal ArticleDOI
Repeatability and reproducibility of central corneal thickness measurement with Pentacam, Orbscan, and ultrasound.
TL;DR: In the assessment of normal corneas, the Pentacam measured CCT values closer to ultrasound pachymetry and with less variability compared with Orbscan, and the (interobserver) reproducibility with the PentACam was highest of all 3 modalities.
Journal Article
Repeatability and reproducibility of corneal thickness measurements by optical coherence tomography.
TL;DR: This study demonstrates that the OCT measurements show a high degree of repeatability and reproducibility, and is emerging as a promising tool for evaluation of CCT in the clinical setting.
Journal ArticleDOI
An international review of laser Doppler vibrometry: Making light work of vibration measurement
Steve Rothberg,Matthew S. Allen,Paolo Castellini,Dario Di Maio,Joris J.J. Dirckx,David J. Ewins,Ben J. Halkon,Pieter G.G. Muyshondt,Nicola Paone,Teresa J. Ryan,H. Steger,Enrico Primo Tomasini,Steve Vanlanduit,Joseph F. Vignola +13 more
TL;DR: This comprehensive review paper charts advances in the development and applications of laser Doppler vibrometry (LDV) since those first pioneering experiments, and considers the challenges that continue to be posed by laser speckle.
Journal ArticleDOI
Size-dependent vibration of nickel cantilever microbeams: Experiment and gradient elasticity
TL;DR: In this paper, the size-dependent elasticity of a series of nickel cantilever microbeams was investigated experimentally for the first time, and the experimental results revealed that the dimensionless natural frequencies of the cantilevers increase to about 2.1 times with the beam thickness decreasing from 15-2.1 μm.
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