Abstract
Measurement systems for online nondestructive full-field three-dimensional (3D) displacement based on the single-shot and multiplexing techniques attract more and more interest, especially throughout the manufacturing industries. This paper proposes an accurate and easy-to-implement method based on an electronic speckle pattern interferometer (ESPI) with single illumination-detection path to realize the online nondestructive full-field 3D displacement measurement. The simple and compact optical system generates three different sensitivity vectors to enable the evaluation of the three orthogonal displacement components. By applying the spatial carrier phase-shifting technique, the desired information can be obtained in real time. The theoretical analysis and the measurement results have proven the feasibility of this ESPI system and quantified its relative measurement error.
Highlights
Due to the increased manufacturing demand for advanced materials and applications, especially in the industries of robotics, automotive, and aerospace, the technology for online measuring nondestructive full-field three-dimensional (3D) displacement is gradually becoming of great interest [1,2]
This paper proposes a new interferometric measurement system with a single illuminationdetection path for online measurement of the full-field 3D displacement
By substituting Equations (1) and (4) into Equation (3), the phase change distributions of six interferograms can be represented by the functions of the displacement components and the observation angles, i.e., ∆φij = f
Summary
Due to the increased manufacturing demand for advanced materials and applications, especially in the industries of robotics, automotive, and aerospace, the technology for online measuring nondestructive full-field three-dimensional (3D) displacement is gradually becoming of great interest [1,2]. The computer vision-based sensors have various industrial applications—for example, to control and check visual appearance in the production process, to monitor static and dynamic displacements of civil engineering structures, to assess the quantitative structural integrity, to monitor low- and high-frequency vibration of engineering structures, and to measure surface traction fields to represent the magnitude and direction of force applied to the skin’s surface, etc This method can be challenging under the conditions of small depth of field or limited accessibility for detectors, etc. To introduce different sensitivity vectors, an interferometric configuration with multiple illuminations and single detector is widely used In this case, an online measurement can be realized by using spatial phase-shifting technique, together with, for example, the manipulation of the coherency of object and reference beams [22], or the control of the beams’ polarization [23], or the introduction of a multi-wavelength laser [24]. The working principle of this measurement system is introduced, and the experimental results obtained from a rigid-body rotation and deformation by a central load are presented and discussed
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