Abstract Real-Time digital holography is used to measure the diffusivities of ethylene glycol-water system at 25 ℃. The experimental technique and two methods based on horizontal and curved fringes for processing holographic image data are presented in detail. 0.33 mol·L-1 aqueous solution of potassium chloride at 25 ℃ was used as a reference system to check the two methods. Compared with literature data, the results show that both methods are reliable with good accuracy. Measurements are conducted at 6 concentrations of the ethylene glycol-water system and the results of both methods are also compared with the reported data. The average relative deviation of the curved fringe method is 1.3%, slightly superior to that of the horizontal fringes method. Moreover，diffusivities calculated by the two methods fluctuate with the choice of time. A comparison of the standard deviations of the two methods shows that the curved fringe method is more stable than the horizontal fringe method.
ZHOU Mi, ZHANG Ya-Hui, YUAN Xi-Gang.Diffusivity Measurement of Liquid Solutions by Real-Time Digital Holography[J] Chemcial Industry and Engineering, 2014,V31(6): 24-28
2014, Vol. 31 
