Accurate dynamic 3D deformation measurement based on the synchronous multiplexing of polarization and speckle metrology

Abstract

An accurate dynamic 3D deformation measurement method realized by the combination of phase-shifting speckle interferometry and speckle correlation is proposed. By converting the speckle field and the reference field into a circular polarized and linear polarized state, the three-step phase-shifting speckle interferograms and one specklegram were recorded directly and simultaneously within a single image by using a polarization camera. Then, the out-of-plane deformation was demodulated from the synchronous phase-shifting fringe patterns, and the in-plane deformation was measured by performing correlation calculations by using specklegrams with the effect of the reference field ignored. Thus, the full-field 3D deformation was obtained precisely. Experimental results demonstrated the accuracy and dynamic measurement ability of the proposed method, which is compact and feasible for actual dynamic scenes.

High-resolution imaging for in-situ non-destructive testing by quantitative lensless digital holography

“…Related work in this area is continually exploiting the capabilities of new and advanced holographic methods. As mentioned previously, temporal instability is a significant challenge for DHI within industrial settings, and this could be overcome with innovative phase retrieval methods such as single-shot dualwavelength (Wang et al, 2016), space-time paradigm (Wang et al, 2023), parallel phase shifting (Du et al, 2023), optical vortex phase shifting (Qiu et al, 2023), and deep neural networks (Aleksandrovych et al, 2023), among others. Furthermore, the ability to instantaneously reconstruct the optical field at any given distance can be automated with advanced algorithms (Memmolo et al, 2011).…”