羊脊椎骨生物力学实验 - 新拓三维技术（深圳）有限公司

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Biomechanical experiment of sheep vertebrae

Experimental purpose

The purpose of this experiment is to study the torsion and bending of sheep's vertebrae under load. The real-time image obtained by XTDIC-STROBE system reflects the angular displacement of sheep's vertebrae

Experimental equipment

XTDIC-STROBE system, XTDP system, 400*300mm calibration board, coding marking points, non-coding marking points

XTDIC-STROBE is based on binocular stereo vision technology, two high-speed cameras are used to collect real-time images of each deformation stage of the object under test. Accurate recognition of the marking points (coded marking points and non-coded marking points) is used to achieve stereo matching. The 3D coordinates of the object surface points are reconstructed and the deformation of

the object is calculated. This method has the characteristics of high accuracy, fast speed, easy operation, non-contact and full-field data measurement

Experimental process

（一） adjust the focal length and aperture of the lens to ensure clear image and uniform brightness;

（二） system calibration.

（1）Considering the need for coordinate transformation before the experimental measurement, the coordinate origin should be fixed to the center of the base of the circular platform, and the Z axis and the axis of the circular platform should vertically upward (X and Y

axis are not required), therefore, non-coding marking points should be pasted on the surface and around the circular platform, and the

calibration plate should be placed on the circular platform. With the help of photogrammetric system, all points information should be obtained and corresponding creation should be made. Elements (cylinder, truncated circle), results using "321 coordinate transformation" to get the required coordinate

Data processing

Using XTDIC-STROBE software, the calculation of experimental data is completed, the deformation region is created, and the analysis of the locus of non-coding marking points is completed. Finally, the corresponding angular displacement can be calculated with the information of the following points in the converted coordinates

Matters needing attention

（一）The experimental environment is stable and there is no obvious vibration;

（二）The XTDIC-STROBE system ensures that the camera lens is clean and the probe does not move after calibration;

（三）The experimental process is closely monitored to avoid human interference affecting the experimental results.

Experiment summary

（一）The system can track non-coding marking points at fixed points and complete biomechanical experiments

（二）In this experiment, with the help of XTDP system, the point information is imported into XTDIC-STROBE system after completing"321 coordinate transformation", and the global point is used to realize the calibration. Finally, the coordinate system is unified, which reflects the collaboration between the devices