Real-time Optical Holographic Interferometry for High-Speed High-Sensitivity Deformation Studies

Time-resolved strain and deformation measurements are valuable as indirect indicators of internal pressure for confinement vessels, and as direct measures of early-time response in mechanical impact experiments. Surface-mounted strain gages are the most common methods of strain determination, offering high-sensitivity and high temporal resolution, but as point measurements can only represent a small fraction of the area of interest. Digital Image Correlation (DIC) is a common alternative offering full-field deformation/strain determination, but suffers from an inverse relationship between field-of-view and sensitivity. In contrast to both these methods, traditional holographic interferometry offers wavelength-level sensitivity that is independent of object size or field-of-view and can operate at high temporal resolution using modern high-speed cameras. In this presentation, we show how modern photopolymeric materials simplify the application of in situ holographic interferometry materials to enable holographic interferometry in deflagration-to-detonation studies. 

This work was performed under the auspices of the U.S. Department of Energy by Lawrence Livermore National Laboratory under contract DE-AC52-07NA27344. Lawrence Livermore National Security, LLC.