Abstract
Diffusing wave spectroscopy (DWS) measurement has been developed to work with a high-speed charge coupled device (CCD). A real-time measurement of autocorrelation function for a nonergodic system was performed to study statistical interaction between particles of electrorheological fluids. As a test, DWS measurements on an ergodic system were achieved using both a high-speed CCD and single-mode fiber, and the deviation of the characteristic decay times using these two methods is less than 2% for glass bead/silicone oil suspension. In the method of DWS based on a high-speed CCD, the multispeckle measurement enables one to do the ensemble average directly. The CCD with the highest rate of 8000 frames/s makes it possible to investigate the short-time behavior of nonergodic systems. The structure response time is obtained by measuring the light transmittance through samples under different electric fields. By analyzing diffusion coefficient of a sample, the force response time is also obtained.
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