磁気共鳴画像法による対流運動の計測(計測・高周波デバイス)

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This paper introduces a method for measurement of flow velocity using nuclear magnetic resonance (NMR) imaging. In a zinc electrodeposition bath, a convection of ZnSO_4 solution was generated at a Rayleigh number of 2.7 × 10^<11>. The electrolytic bath had a pair of horizontal zinc electrodes with a radius of 13 mm. Stejskal-Tanner plots of the fluid were measured with q gradients up to 41.5 mm^<-1>. Probability density functions (average propagators) of the displacement of fluid in the q gradient interval Δ = 20 ms were obtained by Fourier transform of the Stejskal-Tanner plots. The half bandwidths of the average propagators with and without convection were 4.6 × 10^<-2> mm and 3.6 × 10^<-2> mm, respectively. Maps of the x, y, and z components of the flow velocity were calculated from phase maps. The half bandwidth of the average propagator obtained from the flow velocity map was 5.1 × 10^<-2> mm. These methods enable non-invasive and quantitative evaluation of transport phenomena by convection in electrodeposition processes.
社団法人日本磁気学会の論文
2004-05-01