A new instrument has been developed for the photoelastic analysis of dynamic events. The instrument is based on the PSIOS (Phase-Stepped Images Obtained Simultaneously) system developed by Patterson and Wang (1), which enables four phase-stepped photoelastic images to be collected simultaneously. Where the new instrument differs is that the original instrument requires four cameras to collect the four images, whereas the new instrument requires only one camera. This enables the use of very expensive high-speed cameras. The instrument, which can be used for transmission and reflection photoelasticity, has been tested on static examples and found to work well.
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