Analysis and optimization of the stereo-system with a four-mirror adapter

Wang, Rong; Li, Xiaoyan; Zhang, Yang

doi:10.2971/jeos.2008.08033

Cited by 19 publications

(10 citation statements)

References 15 publications

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“…This principle has been successfully used before to study in three-dimensions the structure of gas flames, as well as the 3D trajectories and kinematics of particles and bubbles [19][20][21]. The geometry and the performance of the stereo adapter employed here have already been discussed in detail by Wang et al [22]. The camera was equipped with a 24 -70 mm zoom lens.…”

Section: Methodsmentioning

confidence: 99%

Study of drag and orientation of regular particles using stereo vision, Schlieren photography and digital image processing

Carranza

Zhang

2017

Powder Technology

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A new experimental, image-based methodology suitable to track the changes in orientation of non-spherical particles and their influence on the drag coefficient as they settle in fluids is presented. Given the fact that non-spherical solids naturally develop variations in their angular orientation during the fall, none-intrusiveness of the technique of analysis is of paramount importance in order to preserve the particle/fluid interaction undisturbed. Three-dimensional quantitative data about the motion parameters is obtained through single-camera stereo vision whilst qualitative visualizations of the adjacent fluid patterns are achieved with Schlieren photography. The methodology was validated by comparing the magnitudes of the drag coefficient of a set of spherical particles at terminal velocity conditions against those estimated from drag correlations published in the literature. A noteworthy similarity was attained. During the fall of non-spherical solids, once the particle Reynolds number approximated 163 for disks, and 240 for cylinders, or exceeded those values, secondary motions composed by regular oscillations and tumbling were present. They altered the angular orientation of the particles with respect to the main motion direction and caused complete turbulent patterns in the surrounding flow, therefore affecting the instantaneous projected area, drag force, and coefficient of resistance. The impact of the changes in angular orientation onto the drag coefficient was shown graphically as a means for reinforcing existing numerical approaches, however, an explicit relation between both variables could not be observed.

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Section: Methodsmentioning

confidence: 99%

Study of drag and orientation of regular particles using stereo vision, Schlieren photography and digital image processing

Carranza

Zhang

2017

Powder Technology

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“…In the present paper, an improved four mirrors system adapter with a single camera has been employed as stereo system to measure simultaneously in-and out-of-plane displacements. Previous theoretical studies have been developed [20][21][22] and optimized by others authors [23]. Recently, Pankow et al [24] developed a method based in a four mirror system using DIC to analyze the images, highlighting accurate results.…”

Section: Measurement Science and Technologymentioning

confidence: 99%

Optical low-cost and portable arrangement for full field 3D displacement measurement using a single camera

López‐Alba

Felipe-Sesé

Schmeer

et al. 2016

Meas. Sci. Technol.

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In the current paper, an optical low-cost system for 3D displacement measurement based on a single camera and 3D digital image correlation is presented. The conventional 3D-DIC set-up based on a two-synchronized-cameras system is compared with a proposed pseudo-stereo portable system that employs a mirror system integrated in a device for a straightforward application achieving a novel handle and flexible device for its use in many scenarios. The proposed optical system splits the image by the camera into two stereo images of the object. In order to validate this new approach and quantify its uncertainty compared to traditional 3D-DIC systems, solid rigid in and out-of-plane displacements experiments have been performed and analyzed. The differences between both systems have been studied employing an image decomposition technique which performs a full image comparison. Therefore, results of all field of view are compared with those using a stereoscopy system and 3D-DIC, discussing the accurate results obtained with the proposed device not having influence any distortion or aberration produced by the mirrors. Finally, the adaptability of the proposed system and its accuracy has been tested performing quasi-static and dynamic experiments using a silicon specimen under high deformation. Results have been compared and validated with those obtained from a conventional stereoscopy system showing an excellent level of agreement.

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“…The target image distortion is represented as the distortion on the feature points. To extend the measurement view, based on binocular view principle, a virtual dual‐view vision sensor optimized and calibrated by Xue et al is proposed. It avoids the cost of extra cameras and the circuits, which need to be designed for synchronization in dynamic measurements.…”

Section: Introductionmentioning

confidence: 99%

Distortion correction and characteristics measurement of circumferential liquid film based on PLIF

Xue

2019

AIChE Journal

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For its advantages of noninvasion and high temporal-spatial resolution, planar laserinduced fluorescence (PLIF) is increasingly applied to measure the liquid film near axial flow. However, the circumferential distribution characteristics of liquid film, which are significant for heat and mass transfer process, cannot be measured briefly by the axial imaging. Because of the refractive index difference of the gas and liquid as well as the circular pipe, circumferential observation suffers distortion inevitably.

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Analysis and optimization of the stereo-system with a four-mirror adapter

Cited by 19 publications

References 15 publications

Study of drag and orientation of regular particles using stereo vision, Schlieren photography and digital image processing

Study of drag and orientation of regular particles using stereo vision, Schlieren photography and digital image processing

Optical low-cost and portable arrangement for full field 3D displacement measurement using a single camera

Distortion correction and characteristics measurement of circumferential liquid film based on PLIF

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