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Title: Distortion of Digital Image Correlation (DIC) Displacements and Strains from Heat Waves

Abstract

“Heat waves” is a colloquial term used to describe convective currents in air formed when different objects in an area are at different temperatures. In the context of Digital Image Correlation (DIC) and other optical-based image processing techniques, imaging an object of interest through heat waves can significantly distort the apparent location and shape of the object. We present that there are many potential heat sources in DIC experiments, including but not limited to lights, cameras, hot ovens, and sunlight, yet error caused by heat waves is often overlooked. This paper first briefly presents three practical situations in which heat waves contributed significant error to DIC measurements to motivate the investigation of heat waves in more detail. Then the theoretical background of how light is refracted through heat waves is presented, and the effects of heat waves on displacements and strains computed from DIC are characterized in detail. Finally, different filtering methods are investigated to reduce the displacement and strain errors caused by imaging through heat waves. The overarching conclusions from this work are that errors caused by heat waves are significantly higher than typical noise floors for DIC measurements, and that the errors are difficult to filter because themore » temporal and spatial frequencies of the errors are in the same range as those of typical signals of interest. In conclusion, eliminating or mitigating the effects of heat sources in a DIC experiment is the best solution to minimizing errors caused by heat waves.« less

Authors:
ORCiD logo [1];  [1]
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  1. 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:
1411616
Report Number(s):
SAND-2017-11495J
Journal ID: ISSN 0014-4851; PII: 354; TRN: US1800253
Grant/Contract Number:  
AC04-94AL85000; NA0003525
Resource Type:
Accepted Manuscript
Journal Name:
Experimental Mechanics
Additional Journal Information:
Journal Volume: 58; Journal Issue: 7; Journal ID: ISSN 0014-4851
Publisher:
Springer
Country of Publication:
United States
Language:
English
Subject:
42 ENGINEERING; 71 CLASSICAL AND QUANTUM MECHANICS, GENERAL PHYSICS; Digital image correlation (DIC); Heat waves; Refractive index; Uncertainty quanitification (UQ)

Citation Formats

Jones, E. M. C., and Reu, P. L. Distortion of Digital Image Correlation (DIC) Displacements and Strains from Heat Waves. United States: N. p., 2017. Web. doi:10.1007/s11340-017-0354-3.
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Jones, E. M. C., & Reu, P. L. Distortion of Digital Image Correlation (DIC) Displacements and Strains from Heat Waves. United States. https://doi.org/10.1007/s11340-017-0354-3
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Jones, E. M. C., and Reu, P. L. Tue . "Distortion of Digital Image Correlation (DIC) Displacements and Strains from Heat Waves". United States. https://doi.org/10.1007/s11340-017-0354-3. https://www.osti.gov/servlets/purl/1411616.
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@article{osti_1411616,
title = {Distortion of Digital Image Correlation (DIC) Displacements and Strains from Heat Waves},
author = {Jones, E. M. C. and Reu, P. L.},
abstractNote = {“Heat waves” is a colloquial term used to describe convective currents in air formed when different objects in an area are at different temperatures. In the context of Digital Image Correlation (DIC) and other optical-based image processing techniques, imaging an object of interest through heat waves can significantly distort the apparent location and shape of the object. We present that there are many potential heat sources in DIC experiments, including but not limited to lights, cameras, hot ovens, and sunlight, yet error caused by heat waves is often overlooked. This paper first briefly presents three practical situations in which heat waves contributed significant error to DIC measurements to motivate the investigation of heat waves in more detail. Then the theoretical background of how light is refracted through heat waves is presented, and the effects of heat waves on displacements and strains computed from DIC are characterized in detail. Finally, different filtering methods are investigated to reduce the displacement and strain errors caused by imaging through heat waves. The overarching conclusions from this work are that errors caused by heat waves are significantly higher than typical noise floors for DIC measurements, and that the errors are difficult to filter because the temporal and spatial frequencies of the errors are in the same range as those of typical signals of interest. In conclusion, eliminating or mitigating the effects of heat sources in a DIC experiment is the best solution to minimizing errors caused by heat waves.},
doi = {10.1007/s11340-017-0354-3},
journal = {Experimental Mechanics},
number = 7,
volume = 58,
place = {United States},
year = {Tue Nov 28 00:00:00 EST 2017},
month = {Tue Nov 28 00:00:00 EST 2017}
}
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Journal Article:
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Publisher's Version of Record
https://doi.org/10.1007/s11340-017-0354-3
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Cited by: 21 works
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Figures / Tables:

Figure 1 Figure 1: Experimental setup for observing deformation of a specimen from above while the specimen was heated in an oven.
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Works referenced in this record:

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    A Correction Method for Heat Wave Distortion in Digital Image Correlation Measurements Based on Background-Oriented Schlieren
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    • Ma, Chang; Zeng, Zhoumo; Zhang, Hui
    • Applied Sciences, Vol. 9, Issue 18
    • DOI: 10.3390/app9183851
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