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    A smartphone camera and built-in gyroscope based application for non-contact yet accurate off-axis structural displacement measurements

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    Name:
    measur108449.pdf
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    3.500Mb
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    Description:
    Accepted Manuscript
    Embargo End Date:
    2022-09-16
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    Type
    Article
    Authors
    Yu, Liping
    Lubineau, Gilles cc
    KAUST Department
    Composite and Heterogeneous Material Analysis and Simulation Laboratory (COHMAS)
    Mechanical Engineering Program
    Physical Science and Engineering (PSE) Division
    KAUST Grant Number
    BAS/1/1315-01-01
    Date
    2020-09-16
    Embargo End Date
    2022-09-16
    Permanent link to this record
    http://hdl.handle.net/10754/665222
    
    Metadata
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    Abstract
    Image-based optical methods have been widely used for noncontact structural displacement measurements, due to their prominent advantages over conventional contact sensors. However, existing optical methods usually require complicated and expensive imaging systems, and have difficulties to accurately measure in-plane displacements when the optical axis is not perpendicular to surface of the object (i.e., off-axis measurement). In this work, we develop a low-cost and portable smartphone-based optical method for accurately measuring off-axis structural displacements. The theoretical equations of the in-plane physical displacements on the object surface are derived based on the smartphone gyroscope data that can be used to determine the rotation matrix between the defined world coordinate system and the camera coordinate system. Simple calibration tests are performed to validate the accuracy of the smartphone gyroscope in detecting the rotation angles. The effectiveness and accuracy of this method in off-axis structural displacement measurement are then verified by two in-plane translation tests in laboratory condition. Finally, the noise from the smartphone camera is evaluated, and the effectiveness of the proposed method in continuous displacement measurement is further confirmed the vibration measurement of a hanging light under random wind load.
    Citation
    Yu, L., & Lubineau, G. (2021). A smartphone camera and built-in gyroscope based application for non-contact yet accurate off-axis structural displacement measurements. Measurement, 167, 108449. doi:10.1016/j.measurement.2020.108449
    Sponsors
    The research reported in this publication was supported by funding from King Abdullah University of Science and Technology (KAUST) , under award number BAS/1/1315-01-01.
    Publisher
    Elsevier
    Journal
    Measurement
    DOI
    10.1016/j.measurement.2020.108449
    Additional Links
    https://www.sciencedirect.com/science/article/pii/S0263224120309775
    ae974a485f413a2113503eed53cd6c53
    10.1016/j.measurement.2020.108449
    Scopus Count
    Collections
    Articles; Physical Science and Engineering (PSE) Division; Mechanical Engineering Program

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