Results 101 to 110 of about 29,054 (216)

Consequences of spectrograph illumination for the accuracy of radial-velocimetry

, 2010
For fiber-fed spectrographs with a stable external wavelength source, scrambling properties of optical fibers and, homogeneity and stability of the instrument illumination are important for the accuracy of radial-velocimetry. Optical cylindric fibers are
Boisse, I., Bouchy, F., Chazelas, B., Hebrard, G., Lovis, C., Pepe, F., Perruchot, S.   +6 more
core   +2 more sources

Uncertainty assessment for a towed underwater stereo PIV system by uniform flow measurement

International Journal of Naval Architecture and Ocean Engineering, 2018
The present study aims to assess test uncertainty assessment method of nominal wake field measurement by a Stereoscopic Particle Image Velocimetry (SPIV) system in a towing tank.
Bum Woo Han, Jeonghwa Seo, Seung Jae Lee, Dong Myung Seol, Shin Hyung Rhee   +4 more
doaj   +1 more source

Direct Measurement of Turbulent Shear

, 2011
A photon correlation method is introduced for measuring components of the shear rate tensor in a turbulent soap film. This new scheme, which is also applicable to three-dimensional flows, is shown to give the same results as Laser Doppler velocimetry ...
Goldburg, Walter, Steers, Stanley, Stefanus, Stefanus   +2 more
core   +1 more source

Optical PIV and LDV Comparisons of Internal Flow Investigations in SHF Impeller

International Journal of Rotating Machinery, 2006
The paper presents a comparison between two sets of experimental results in a centrifugal flow pump. The tested impeller is the so-called SHF impeller for which many experimental data have been continuously produced to built databases for CFD code ...
G. Wuibaut, G. Bois, M. El Hajem, A. Akhras, J. Y. Champagne   +4 more
doaj   +1 more source

Visual Calibration for Multiview Laser Doppler Speed Sensing

Sensors, 2019
We present a novel calibration method for a multi-view laser Doppler speed sensing (MLDSS) system. In contrast with the traditional method where only the laser geometry is independently calibrated, the proposed method simultaneously optimizes all the ...
Yunpu Hu, Leo Miyashita, Yoshihiro Watanabe, Masatoshi Ishikawa   +3 more
doaj   +1 more source

Phase-coherent detection of an optical dipole force by Doppler velocimetry

, 2011
We report phase-coherent Doppler detection of optical dipole forces using large ion crystals in a Penning trap. The technique is based on laser Doppler velocimetry using a cycling transition in $^{9}$Be$^{+}$ near 313 nm and the center-of-mass (COM) ion ...
A. P. VanDevender, Berkeland, Biercuk, Biercuk, Blatt, Bollinger, Bollinger, Bollinger, Brewer, Campbell, Gerritsma, H. Uys, Haffner, Huang, Huang, Itano, J. J. Bollinger, J. W. Britton, Jensen, Jensen, Kim, Kim, Kim, King, Leibfried, Leibfried, M. J. Biercuk, Mitchell, Mitchell, Monroe, Nagerl, Olmschenk, Porras, Reichle, Sackett, Schmidt, Schmidt-Kaler, Turchette, Wineland, Wineland   +39 more
core   +1 more source

Research and Medical Transcranial Doppler System

Archives of Acoustics, 2016
A new ultrasound digital transcranial Doppler system (digiTDS) is introduced. The digiTDS enables diagnosis of intracranial vessels which are rather difficult to penetrate for standard systems.
Marcin LEWANDOWSKI, Mateusz WALCZAK, Piotr KARWAT, Beata WITEK, Paweł KARŁOWICZ   +4 more
doaj   +1 more source

On High Explosive Launching of Projectiles for Shock Physics Experiments

, 2007
The hydrodynamic operation of the `Forest Flyer' type of explosive launching system for shock physics projectiles was investigated in detail using one- and two-dimensional continuum dynamics simulations.
Buttler, William T., Clark, David A., Forest, Charles A., Marr-Lyon, Mark, Rightley, Paul, Swift, Damian C.   +5 more
core   +1 more source

Externally Dispersed Interferometry for Precision Radial Velocimetry [PDF]

, 2007
Externally Dispersed Interferometry (EDI) is the series combination of a fixed-delay field-widened Michelson interferometer with a dispersive spectrograph.
Edelstein, J., Erskine, D. J., Feuerstein, W. M., Herter, T., Lloyd, J., Muirhead, P., Muterspaugh, M. W., Wishnow, E.   +7 more
core   +1 more source

Laser-Doppler Velocimetry Measurements Inside a Backward Curved Centrifugal Fan

International Journal of Rotating Machinery, 2001
Laser-Doppler velocimetry (LDV) measurements are presented of relative mean velocity and turbulence intensity components inside the impeller passage of a centrifugal fan with twelve backward curved blades at design, under-design, and over-design flow ...
Tong-Miin Liou, Meng-Yu Chen
doaj   +1 more source