Progress of videogrammetric measurement techniques for high speed wind tunnel test

Videogrammetric measurement for wind tunnel test is research focus at home and abroad because it has no special requirements on the test model.The key technical progresses of the videogramnetric measurement for the vibration environment of the high speed wind tunnel are introduced in this paper,such as the solution of exterior parameters in big-angle large overlap, the algorithm of image processing for extracting marked point,the method of camera calibration and wave-front distortion field measurement.The great application prospects of videogrammetric measurement in 2m size high-speed wind tunnel test are demonstrated by several practical cases, which show that the precision of the videogrammetry is high,that is,the standard deviation of angle of attack is equal to or smaller than 0.0075°;the standard uncertainty of the deformation data is 5.232±0.082mm;videogrammetry provides a new way to research on and measure aero-optic effects.The method which is simple and does not require expensive coherent light sources.