Abstract
A new method of doing DWS (diffusing wave spectroscopy) measurement has been developed by using high speed CCD to investigate the structure and the dynamics of nonergodic and concentrated system such as electrorheological (ER) fluids under high electric field. The DWS results from the CCD method and the traditional method using a single-mode optical fiber agree well for ergodic system. The structure response time is obtained by measuring the transmittance of the sample under different electric field. The force response time of about 100ms is obtained from the time-dependent diffusion coefficient. In this paper, by comparing the time variation of transmittance and diffusion coefficient obtained under different conditions, a criterion of fast and strong responses of practical ER fluids to electric field is provided.
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