Abstract
Abstract This paper presents the use of an acrylamide-based photopolymer as the recording medium in holographicInterferometry. The recorded hologram can also provide a speckle reference image for out-of-plane sensitive electronicspeckle pattern interferometry. This dual use of the hologram is demonstrated in the testing of thick plastic PVC pipes,which were internally pressurized. The radial strain was measured using holographic interferometry by measuring theout-of-plane motion of the object due to a known change in pressure inside the cylinder. The radial strain for the samemagnitude of internal pressure change was also investigated using electronic speckle pattern interferometry (ESPI) byusing the hologram stored in the photopolymer acting as a holographic optical element. A hologram was also recordedat a wavelength of 532nm and the image was reconstructed at laser diode wavelength of 784nm. The hologram wasused in an ESPI system as before. As the diode can be wavelength modulated, digital phase shifting can beimplemented in both interferometric techniques for detailed fringe analysis.Key words: Holography, Interferometry, Photopolymer, Holographic Optical Element.
Published Version
Talk to us
Join us for a 30 min session where you can share your feedback and ask us any queries you have
Schedule a call