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    Effect of camera temperature variations on stereo-digital image correlation measurements

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    Type
    Article
    Authors
    Pan, Bing
    Shi, Wentao
    Lubineau, Gilles cc
    KAUST Department
    Composite and Heterogeneous Material Analysis and Simulation Laboratory (COHMAS)
    Mechanical Engineering Program
    Physical Science and Engineering (PSE) Division
    Date
    2015-11-25
    Online Publication Date
    2015-11-25
    Print Publication Date
    2015-12-01
    Permanent link to this record
    http://hdl.handle.net/10754/595515
    
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    Abstract
    In laboratory and especially non-laboratory stereo-digital image correlation (stereo-DIC) applications, the extrinsic and intrinsic parameters of the cameras used in the system may change slightly due to the camera warm-up effect and possible variations in ambient temperature. Because these camera parameters are generally calibrated once prior to measurements and considered to be unaltered during the whole measurement period, the changes in these parameters unavoidably induce displacement/strain errors. In this study, the effect of temperature variations on stereo-DIC measurements is investigated experimentally. To quantify the errors associated with camera or ambient temperature changes, surface displacements and strains of a stationary optical quartz glass plate with near-zero thermal expansion were continuously measured using a regular stereo-DIC system. The results confirm that (1) temperature variations in the cameras and ambient environment have a considerable influence on the displacements and strains measured by stereo-DIC due to the slightly altered extrinsic and intrinsic camera parameters; and (2) the corresponding displacement and strain errors correlate with temperature changes. For the specific stereo-DIC configuration used in this work, the temperature-induced strain errors were estimated to be approximately 30–50 με/°C. To minimize the adverse effect of camera temperature variations on stereo-DIC measurements, two simple but effective solutions are suggested.
    Citation
    Effect of camera temperature variations on stereo-digital image correlation measurements 2015, 54 (34):10089 Applied Optics
    Publisher
    The Optical Society
    Journal
    Applied Optics
    DOI
    10.1364/AO.54.010089
    Additional Links
    https://www.osapublishing.org/abstract.cfm?URI=ao-54-34-10089
    ae974a485f413a2113503eed53cd6c53
    10.1364/AO.54.010089
    Scopus Count
    Collections
    Articles; Physical Science and Engineering (PSE) Division; Mechanical Engineering Program

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