Dynamic photoelasticity using TDI imaging

High-speed photographic systems are necessary for recording and visualization of dynamic events in stress analysis, fluid mechanics, etc. Current imaging systems are fairly expensive and generally not simple to use. Furthermore, most are based on photographic film recording systems requiring time consuming and tedious wet processing of the films. Recently, there is lot of interest in developing and modifying CCD architectures and recording arrangements for dynamic scene analysis. Herein we report the use of a CCD camera operating in the time delay and integration mode for digitally recording dynamic photoelastic stress patterns. Applications in strobe and streak photoelastic pattern recording and system limitations will be explained in the paper. In addition, a scheme for dynamic phase shifting using is also explained. (C) 2002 Elsevier Science Ltd. All rights reserved.