scholarly journals Using laser Doppler vibrometry to measure capillary surface waves on fluid-fluid interfaces

2010 ◽  
Vol 4 (2) ◽  
pp. 026501 ◽  
Author(s):  
James Friend ◽  
Leslie Yeo
Keyword(s):  
Surface Waves ◽  
Laser Doppler ◽  
Fluid Interfaces ◽  
Capillary Surface ◽  
Laser Doppler Vibrometry

Facial Muscle Activity: High-Sensitivity Noncontact Measurement Using Laser Doppler Vibrometry

2021 ◽  
Vol 70 ◽  
pp. 1-10
Author(s):  
Sara Casaccia ◽  
Erik J. Sirevaag ◽  
Mark G. Frank ◽  
Joseph A. O'Sullivan ◽  
Lorenzo Scalise ◽  
...  
Keyword(s):  
Muscle Activity ◽  
High Sensitivity ◽  
Laser Doppler ◽  
Facial Muscle ◽  
Laser Doppler Vibrometry ◽  
Noncontact Measurement

Two-Photon Polymerization Lithography and Laser Doppler Vibrometry of a SU-8-Based Suspended Microchannel Resonator

2015 ◽  
Vol 24 (4) ◽  
pp. 1038-1042 ◽  
Author(s):  
Celso Accoto ◽  
Antonio Qualtieri ◽  
Ferruccio Pisanello ◽  
Carlo Ricciardi ◽  
Candido Fabrizio Pirri ◽  
...  
Keyword(s):  
Laser Doppler ◽  
Laser Doppler Vibrometry ◽  
Two Photon ◽  
Two Photon Polymerization

Use of Laser Doppler Vibrometry for Measuring Flow-Induced Vibration of a Thermowell in a Pipe Flow

2021 ◽  
Author(s):  
Sejong Chun ◽  
Sibok Lee ◽  
Hyewon Yoon
Keyword(s):  
Strain Rate ◽  
Laser Doppler ◽  
Vortex Street ◽  
Rate Measurement ◽  
Flow Induced Vibration ◽  
Laser Doppler Vibrometry ◽  
Karman Vortex Street ◽  
Kármán Vortex Street ◽  
Karman Vortex ◽  
Strain Rate Measurement

Abstract Thermowells with helical strakes are becoming promising to prevent them from fatigue fracture by Kármán vortex street. Many studies suggest various kinds of measurement techniques, including strain rate measurement, acceleration measurement, and high-speed visualization to evaluate the role of Kármán vortex street to the flow-induced vibration. Nevertheless, use of laser Doppler vibrometry has not yet been reported in the literature. This study compared the tip deflection of a thermowell due to the flow-induced vibration by using the laser Doppler vibrometry and the strain rate measurement. The laser Doppler vibrometry could measure the tip deflection directly. On the other hand, the strain rate measurement had to convert the strain rate into the tip deflection through the Euler-Bernoulli beam theory. Measurement equivalence between the laser Doppler vibrometry and the strain rate measurement was discussed with the results of tip deflections of the thermowell.

Application of laser Doppler vibrometry for ultrasonic velocity assessment in a composite panel with defect

2018 ◽  
Vol 184 ◽  
pp. 1030-1039 ◽  
Author(s):  
L. Maio ◽  
F. Ricci ◽  
V. Memmolo ◽  
E. Monaco ◽  
N.D. Boffa
Keyword(s):  
Ultrasonic Velocity ◽  
Laser Doppler ◽  
Composite Panel ◽  
Laser Doppler Vibrometry

scholarly journals Chemical expansion of praseodymium-cerium oxide films at high temperatures by laser doppler vibrometry

2018 ◽  
Vol 319 ◽  
pp. 61-67 ◽  
Author(s):  
Silja Schmidtchen ◽  
Holger Fritze ◽  
Sean Bishop ◽  
Di Chen ◽  
Harry L. Tuller
Keyword(s):  
Cerium Oxide ◽  
High Temperatures ◽  
Oxide Films ◽  
Laser Doppler ◽  
Laser Doppler Vibrometry ◽  
Chemical Expansion

scholarly journals Resonant Mixing in Glass Bowl Microbioreactor Investigated by Microparticle Image Velocimetry

Micromachines ◽  
2019 ◽  
Vol 10 (5) ◽  
pp. 284 ◽  
Author(s):  
Sven Meinen ◽  
Lasse Jannis Frey ◽  
Rainer Krull ◽  
Andreas Dietzel
Keyword(s):  
Surface Waves ◽  
Growth Conditions ◽  
Capillary Surface ◽  
Mixing Conditions ◽  
Glass Slides ◽  
Image Velocimetry ◽  
Resonance Frequencies ◽  
Microparticle Image Velocimetry ◽  
Growing Conditions ◽  
Vortex Patterns

Microbioreactors are gaining increased interest in biopharmaceutical research. Due to their decreasing size, the parallelization of multiple reactors allows for simultaneous experiments. This enables the generation of high amounts of valuable data with minimal consumption of precious pharmaceutical substances. However, in bioreactors of all scales, fast mixing represents a crucial condition. Efficient transportation of nutrients to the cells ensures good growing conditions, homogeneous environmental conditions for all cultivated cells, and therefore reproducible and valid data. For these reasons, a new type of batch microbioreactor was developed in which any moving mixer component is rendered obsolete through the utilization of capillary surface waves for homogenization. The bioreactor was fabricated in photosensitive glass and its fluid volume of up to 8 µL was provided within a bowl-shaped volume. External mechanical actuators excited capillary surface waves and stereo microparticle image velocimetry (µPIV) was used to analyze resulting convection at different excitation conditions in varied reactor geometries. Typical vortex patterns were observed at certain resonance frequencies where best mixing conditions occurred. Based on the results, a simplified 1D model which predicts resonance frequencies was evaluated. Cultivation of Escherichia coli BL21 under various mixing conditions showed that mixing in resonance increased the biomass growth rate, led to high biomass concentrations, and provided favorable growth conditions. Since glass slides containing multiple bowl reactors can be excited as a whole, massive parallelization is foreseen.

scholarly journals Elastic characterization of polymer fibers by laser Doppler vibrometry

2017 ◽  
Vol 99 ◽  
pp. 88-97 ◽  
Author(s):  
Ludovic Labelle ◽  
N.B. Roozen ◽  
Jan Vandenbroeck ◽  
Shuichi Akasaka ◽  
Christ Glorieux
Keyword(s):  
Laser Doppler ◽  
Polymer Fibers ◽  
Laser Doppler Vibrometry
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