You have requested a machine translation of selected content from our databases. This functionality is provided solely for your convenience and is in no way intended to replace human translation. Neither SPIE nor the owners and publishers of the content make, and they explicitly disclaim, any express or implied representations or warranties of any kind, including, without limitation, representations and warranties as to the functionality of the translation feature or the accuracy or completeness of the translations.
Translations are not retained in our system. Your use of this feature and the translations is subject to all use restrictions contained in the Terms and Conditions of Use of the SPIE website.
11 January 2007High speed deformation measurement using digital speckle correlation method
This article discusses an advanced deformation method based on digital speckle correlation method, which is
substantially more robust and has greater dynamic range than other full-field imaging technologies such as ESPI and
moiré. The system tracks the stochastic pattern applied to the measurement surface with sub-pixel accuracy. The object
under test is viewed by a pair of high resolution, digital CCD cameras. Two cameras having been mounted the locations
and attitudes were calibrated prior to measurement by combining nonlinear optimization with accurate calibration points.
The calibration points were formed by an infrared LED, which moved with 3-D coordinate measurement machine. By
using bilinear interpolation square-gray weighted centroid location algorithm, the imaging centers of the calibration
points can be accurate. The speckle images of the same measured zone from different directions for the specimen are
recorded by two cameras before and after deformation. Then the deformation displacement and strain of the specimen is
calculated by these images using digital speckle correlation method and geometrical relation of stereography. The
performance was demonstrated with real translation test.
The alert did not successfully save. Please try again later.
Hua Chen, Dong Ye, Rensheng Che, "High-speed deformation measurement using digital speckle correlation method," Proc. SPIE 6279, 27th International Congress on High-Speed Photography and Photonics, 62791O (11 January 2007);