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

Pan, Bing; Shi, Wentao; Lubineau, Gilles

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

Files

250119.pdf (2.42 MB)

Type

Article

Authors

Pan, Bing
Shi, Wentao
Lubineau, Gilles

KAUST Department

Composite and Heterogeneous Material Analysis and Simulation Laboratory (COHMAS)
Mechanical Engineering Program
Physical Science and Engineering (PSE) Division

Online Publication Date

2015-11-25

Print Publication Date

2015-12-01

Date

2015-11-25

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