Camera system resolution and its influence on digital image correlation

Reu, Phillip L.; Sweatt, William; Miller, Timothy; Fleming, Darryn

doi:10.1007/s11340-014-9886-y

Camera system resolution and its influence on digital image correlation

Journal Article · Sun Sep 21 00:00:00 EDT 2014 · Experimental Mechanics

DOI:https://doi.org/10.1007/s11340-014-9886-y· OSTI ID:1114600

Reu, Phillip L. ^[1]; Sweatt, William ^[1]; Miller, Timothy ^[1]; Fleming, Darryn ^[1]

Sandia National Lab. (SNL-NM), Albuquerque, NM (United States)

Digital image correlation (DIC) uses images from a camera and lens system to make quantitative measurements of the shape, displacement, and strain of test objects. This increasingly popular method has had little research on the influence of the imaging system resolution on the DIC results. This paper investigates the entire imaging system and studies how both the camera and lens resolution influence the DIC results as a function of the system Modulation Transfer Function (MTF). It will show that when making spatial resolution decisions (including speckle size) the resolution limiting component should be considered. A consequence of the loss of spatial resolution is that the DIC uncertainties will be increased. This is demonstrated using both synthetic and experimental images with varying resolution. The loss of image resolution and DIC accuracy can be compensated for by increasing the subset size, or better, by increasing the speckle size. The speckle-size and spatial resolution are now a function of the lens resolution rather than the more typical assumption of the pixel size. The study will demonstrate the tradeoffs associated with limited lens resolution.

View Accepted Manuscript (DOE)

Research Organization:: Sandia National Laboratories (SNL-NM), Albuquerque, NM (United States)

Sponsoring Organization:: USDOE National Nuclear Security Administration (NNSA)

Grant/Contract Number:: AC04-94AL85000

OSTI ID:: 1114600

Report Number(s):: SAND--2013-8737J; PII: 9886

Journal Information:: Experimental Mechanics, Journal Name: Experimental Mechanics Journal Issue: 1 Vol. 55; ISSN 0014-4851

Publisher:: SpringerCopyright Statement

Country of Publication:: United States

Language:: English

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47 OTHER INSTRUMENTATION
digital image correlation
full-field measurement
lens resolution
optical measurements
uncertainty quantification

Camera system resolution and its influence on digital image correlation

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