Abstract
A distribution-measurement system with 8 channel transceivers and multi-surface-coils of 1.3mm outside diameter for monitoring water content distribution in polymer electrolyte membrane (PEM) was developed. Using the CPMG method, water content in PEM can be obtained from echo-signal intensity and T_2(CPMG) relaxation time. MEA (Membrane Electrode Assembly) was put in the cell controlled at the cell temperature of 75℃ and the vapor concentration of 0.14 kg/m^3 in N_2 gas. Time-dependence changes of echo-signal intensity of MEA under water electrolysis condition were obtained by the multi-surface-coils on the anode and cathode electrodes.
