From speckle pattern photography to digital holographic interferometry [Invited]

Abstract

Speckles are inherently an interference phenomenon produced when an optically rough surface or a turbulent medium introduces some degree of randomness to a reflected or a transmitted electromagnetic field. Speckles are often nuisance in coherent image formation. Speckle patterns are however a useful tool for displacement and deformation as well as vibration and stress analysis. The development of speckle photography to speckle interferometry and digital holographic interferometry is described in this paper.

Simultaneous acquisition of 3D shape and deformation by combination of interferometric and correlation-based laser speckle metrology

“…Digital Holographic Interferometry is a well-proven method for the contactless determination of microscopic deformations for non-destructive material analyses [1,2]. In the presented approach, image plane DHI is used to determine deformations in direction of the optical axis of the measurement system (out-of-plane).…”

“…Digital Holographic Interferometry (DHI) is a well-established method for the precise measurement of microscopic deformations [1,2]. By employing DHI for the retrieval of the out-of-plane deformation component and combining it with Digital Speckle Photography (DSP) [3] for the measurement of the in-plane deformation components, 3D deformation fields can be acquired from a single pair of holograms with a simple experimental setup [4].…”

“…The combination of Electronic Speckle Pattern Interferometry (ESPI) [2], which is closely related to DHI, with a photogrammetric 3D coordinate measurement technique has been reported previously by Dirksen et al [5]. However, the former approach required a manual analysis of corresponding points for 3D data acquisition and thus did not allow true full-field measurements.…”

Obtaining four-dimensional vibration information for vibrating surfaces with a Kinect sensor

“…Thus, the application of this technique is narrow in extracting fullfield vibration data. Further discussions of holographic interferometry were presented in many references [9][10][11]. Shearography has been shown to be more resilient to rigid body motion than ESPI or holographic interferometry and may be better suited for industrial applications [12], such as the production and development in the areas of aerospace, wind rotor blades, automation and materials research.…”

Universal optical setup for phase-shifting and spatial-carrier digital speckle pattern interferometry

“…However, displacement transducers suffer from the disadvantage of being a spot measurement technique, which leads to low spatial resolution and insufficient information for full-field deformation measurement. Optical techniques such as digital speckle pattern interferometry (DSPI) [2,3], digital image correlation [4], and Moiré method [5] have become preponderant methods in the measurement of deformation for objects with rough surfaces due to their full-field, stand-off, and non-contact measurement nature. Moreover, optical methods, particularly DSPI, are also very precise tools.…”