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针对立体视觉测量技术在风洞试验中的应用特征,设计基于线阵CCD的三目视觉立体测量系统。利用基于双高斯物镜的组合透镜,在降低光学畸变的前提下实现点光源到线光源的变换。组合镜头可对CCD进行三自由度微调,保证测量目标成像于焦平面附近。在系统标定过程中利用三坐标测量机构建虚拟阵列靶,以最大限度地提高标定靶精度。实例应用结果表明,该系统能够实现三自由度虚拟飞行系统模型运动轨迹的追踪及自由振动系统机械阻尼的测量。
In view of the application characteristics of stereo vision measurement technology in wind tunnel test, a trinocular vision stereo measurement system based on linear CCD is designed. Utilizing the combination lens based on double Gaussian objective lens, the transformation of point light source to line light source is realized under the premise of reducing the optical distortion. The combination lens can finely adjust the CCD for three degrees of freedom to ensure that the measurement target is imaged near the focal plane. In the process of system calibration, a virtual array target is built by CMM to maximize the calibration target accuracy. The practical application shows that this system can track the trajectory of the three-DOF virtual flight system model and measure the mechanical damping of the free vibration system.