Predicting 3D Motions from Single-Camera Optical Test Data
Abstract
In a typical optical test, a stereo camera pair is required to measure the three-dimensional motion of a test article; one camera typically only measures motions in the image plane of the camera, and measurements in the out-of-plane direction are missing. Finite element expansion techniques provide a path to estimate responses from a test at unmeasured degrees of freedom. Treating the case of a single camera as a measurement with unmeasured degrees of freedom, a finite element model is used to expand to the missing third dimension of the image data, allowing a full-field, three-dimensional measurement to be obtained from a set of images from a single camera. The key to this technique relies on the mapping of finite element deformations to image deformations, creating a set of mode shape images that are used to filter the response in the image into modal responses. These modal responses are then applied to the finite element model to estimate physical responses at all finite element model degrees of freedom. The mapping from finite element model to image is achieved using synthetic images produced by a rendering software. Finally, the technique is applied first to a synthetic deformation image, and then is validatedmore »
- Authors:
-
- Sandia National Lab. (SNL-NM), Albuquerque, NM (United States)
- Publication Date:
- Research Org.:
- Sandia National Lab. (SNL-NM), Albuquerque, NM (United States)
- Sponsoring Org.:
- USDOE National Nuclear Security Administration (NNSA)
- OSTI Identifier:
- 1667405
- Report Number(s):
- SAND-2020-8808J
Journal ID: ISSN 0732-8818; 690141
- Grant/Contract Number:
- AC04-94AL85000; NA0003525
- Resource Type:
- Accepted Manuscript
- Journal Name:
- Experimental Techniques
- Additional Journal Information:
- Journal Volume: 45; Journal Issue: 3; Journal ID: ISSN 0732-8818
- Publisher:
- Wiley
- Country of Publication:
- United States
- Language:
- English
- Subject:
- 47 OTHER INSTRUMENTATION; optical; finite element expansion; synthetic images; structural dynamics
Citation Formats
Rohe, D. P., Witt, B. L., and Schoenherr, T. F.. Predicting 3D Motions from Single-Camera Optical Test Data. United States: N. p., 2020.
Web. doi:10.1007/s40799-020-00391-8.
Rohe, D. P., Witt, B. L., & Schoenherr, T. F.. Predicting 3D Motions from Single-Camera Optical Test Data. United States. https://doi.org/10.1007/s40799-020-00391-8
Rohe, D. P., Witt, B. L., and Schoenherr, T. F.. Fri .
"Predicting 3D Motions from Single-Camera Optical Test Data". United States. https://doi.org/10.1007/s40799-020-00391-8. https://www.osti.gov/servlets/purl/1667405.
@article{osti_1667405,
title = {Predicting 3D Motions from Single-Camera Optical Test Data},
author = {Rohe, D. P. and Witt, B. L. and Schoenherr, T. F.},
abstractNote = {In a typical optical test, a stereo camera pair is required to measure the three-dimensional motion of a test article; one camera typically only measures motions in the image plane of the camera, and measurements in the out-of-plane direction are missing. Finite element expansion techniques provide a path to estimate responses from a test at unmeasured degrees of freedom. Treating the case of a single camera as a measurement with unmeasured degrees of freedom, a finite element model is used to expand to the missing third dimension of the image data, allowing a full-field, three-dimensional measurement to be obtained from a set of images from a single camera. The key to this technique relies on the mapping of finite element deformations to image deformations, creating a set of mode shape images that are used to filter the response in the image into modal responses. These modal responses are then applied to the finite element model to estimate physical responses at all finite element model degrees of freedom. The mapping from finite element model to image is achieved using synthetic images produced by a rendering software. Finally, the technique is applied first to a synthetic deformation image, and then is validated using an experimental set of images.},
doi = {10.1007/s40799-020-00391-8},
journal = {Experimental Techniques},
number = 3,
volume = 45,
place = {United States},
year = {2020},
month = {9}
}
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