title: Oscillating gradient measurements of fast oscillatory and rotational motion in the fluids.
abstract: We demonstrate the combination of oscillating gradient waveforms with single-point imaging techniques to perform measurements of rapidly oscillating and/or rotating fluid motion. Measurements of Fourier components of motion can be performed over a wide range of frequencies, while the immunity of single-point imaging to time-evolution artefacts allows applications to systems with great susceptibility variations. The processing approaches, displacement resolution, and the diffusive attenuation are analyzed. Measurements of high-speed flow rotation in a spiral phantom, periodic displacements of oscillating gas in a thermoacoustic device and of cavitating liquid reveal a variety of motion spectra. The potential systems for study with the technique include turbulent motion, cavitation, and multiphase flows in general.
authors.affiliation: MRI Centre, Department of Physics, University of New Brunswick, 8 Bailey Drive, Fredericton, New Brunswick, Canada E3B 5A3. mast@unb.ca
authors.forename: Igor V
authors.initials: IV
authors.lastname: Mastikhin
authors.forename: Nathan L
authors.initials: NL
authors.lastname: Hetherington
authors.forename: Rhys
authors.initials: R
authors.lastname: Emms
mesh_terms: D003198:Computer Simulation; D009682:Magnetic Resonance Spectroscopy / Q000379:methods*; D044085:Microfluidics / Q000379:methods*; D008956:Models, Chemical; D008958:Models, Molecular; D009991:Oscillometry / Q000379:methods*; D012399:Rotation