68. Vibration Test of a Dynamic Target Based on Stereo Machine Vision

The position and posture measurement problem for a dynamic target is widely studied by researching the testing and calibration model of the vertical optical axis binocular vision, deducing the lineup structure of the cameras and the positional relationship between the cameras and the target, then establishing the noncontact vibration test system of a dynamic target. The test system uses double area array charge coupled devices (CCDs) to capture vibration images of the target. The system extracts the pixel position information to calculate the spatial coordinates of the target point; then, according to the target pixel position changes in the whole process, it calculates the displacement variation in three dimensions. Experimental results show that the measurement accuracy is about 0.1 mm, the relative error is less than 5 %, meeting the engineering test requirements.