Abstract
A robust three-perspective digital image correlation (DIC) system based on a cross dichroic prism and single three charge-coupled device (3CCD) color cameras is proposed in this study. Images from three different perspectives are captured by a 3CCD camera using the cross dichroic prism and two planar mirrors. These images are then separated by different CCD channels to perform correlation calculation with an existing multi-camera DIC algorithm. The proposed system is considerably more compact than the conventional multi-camera DIC system. In addition, the proposed system has no loss of spatial resolution compared with the traditional single-camera DIC system. The principle and experimental setup of the proposed system is described in detail, and a series of tests is performed to validate the system. Experimental results show that the proposed system performs well in displacement, morphology, and strain measurement.
Highlights
IntroductionNoncontact, full-field, and high-precision measurement method, this technology is not sensitive to the measurement environment
Digital image correlation (DIC) technology was proposed in the 1980s [1,2]
We propose a compact setup by using a cross dichroic prism to perform multi-perspective DIC measurements
Summary
Noncontact, full-field, and high-precision measurement method, this technology is not sensitive to the measurement environment. This method has been successfully applied to measure displacement and strain in most cases. Traditional 3D-DIC technology obtains images by using two black and white charge-coupled devices (CCDs) or complementary metal oxide semiconductor (CMOS) cameras. A dual-camera system meets the measurement requirements in most cases. Due to limitations in the field of view, it is difficult to obtain satisfactory results by using a dual-camera system if a multi-angle analysis is required. The multi-camera system provides an obvious advantage over the traditional dual-camera system, in that it can cover a large area of measurement and thereby expand the measurement range DIC offers.
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