光学互相关测速系统设计与验证

Design and experimental validation of velocity measurement system based on optical cross correlation method

针对两相流颗粒运动速度测量及基于互相关原理设计了双光路激光测速系统。采用搭建的变频电机带动绕丝产生已知旋转线速度的装置开展光学互相关测速验证实验。通过测量绕丝经双光路激光的光强衰减信号,再对两路信号进行互相关分析,从而得到测点绕丝旋转线速度。以电机转速计算的测点绕丝线速度作为参考值进行测量精度验证,得到光学互相关测速方法的测量相对误差在6%以内,验证了光学互相关测速方法的准确性。

Aiming at the measurement of the moving velocity of two-phase flow particles, a dualpath laser velocimetry experimental system was designed based on the principle of cross correlation, and an optical cross correlation velocimetry experiment was carried out by using a known rotating linear velocity device driven by a variable frequency motor. By measuring the intensity signal of the dual-path lasers around the rotating wire, rotation line velocity of wire at the measured point was calculated by the cross correlation analysis of the two intensity signals of the dual-path lasers. Compared with the calculated line velocities of wire at the measured point by using the rotate speed of motor, the relative deviations were less than 6%, verifying the accuracy of optical mutual light velocimetry.