Holographic and electronic speckle-pattern interferometry using a photopolymer recording material

A thick polyvinyl chloride (PVC) pipe was used for holographic recording. The pipe was first tested using live-fringe holographic interferometry and eventually subjected to ESPI. Same result was obtained for both tests, typically a radial strain of 145 μm corresponding to an internal pressure of 1 bar. In turn, this resulted to a value of 2.78 GN m||-2 for Young's modulus, in good agreement with the manufacturer's data. These results show that an acrylamide-based photopolymer used as the recording medium in holographic interferometry also provides a speckled reference beam in an out-of-plane displacement-sensitive ESPI.