为了满足特殊管道弯曲度的高精度测量要求,提出了一种基于双激光准直电荷耦合器(CCD)的测量方法,介绍了单激光准直与双激光准直CCD的弯曲度测量原理,建立了靶标的动态旋转模型,通过双激光光斑的精确定位与同心圆的现场标定准确地提取靶标的旋转角度,对测量结果进行校正,从而实现特殊管道弯曲度的精确测量。实验结果表明,幅值偏差为±0.01 mm,方位角偏差为±10″,该方法具有较高的测量精度且稳定性好,可满足特殊管道弯曲度的高精度测量要求。

To meet the requirement for the high accuracy curvature measurement of special pipe,a method based on charge coupled device (CCD) dual-laser collimation is proposed. The curvature measurement theories based on both CCD single-laser collimation and dual-laser collimation are introduced. A dynamic rotation model of target is established,and the rotation angle is extracted accurately by the pinpoint method of the dual-laser spots and field calibration method of the concentric circles. Finally,the accurate curvature of special pipe is acquired after correcting the measurement results. Experimental results show that the amplitude errors is ±0.01 mm,and the azimuth angle errors is ±10″. This method is quite stable and accurate,which can meet the requirement for the high accuracy curvature measurement of special pipe.