一种多线结构光测头的误差补偿方法

针对在多线结构光测量系统中光平面不等距和不平行引起测量误差的问题,提出了一种基于标准三角块的误差补偿方法.通过分析测量误差产生的原因,建立了光平面平行度、光平面间距与测量误差之间关系的数学模型,将测头产生的结构光条投射到一个标准三角块斜面上,利用三角块斜面的几何变换能力将光平面平行度、光平面间距的信息转换到系统可以进行精确测量的光平面当中.通过CCD采集和数学计算,可以得到准确的各光平面平行度和光平面间距的误差数据,并根据得到的误差数据对测得的原始数据进行补偿修正,由实验证明了该方法在对阵列式多线结构光测头结构误差补偿后,测量得到的数据精度可以提高约40%.

Errors Compensation Method for Multi-Linear Structured Light Sensor

Aiming at the errors due to un-equivalence and un-parallelism of light planes in the measuring system,an errors compensation method based on triangular standard piece is presented.Analyzing the error origin,the mathematical models of relationships of measuring errors with unequivalence and un-parallelism of light planes are established,and the structured light stripes are projected on the slope of a triangular standard piece,the informations of un-equivalence and un-parallelism of light planes are converted into the light plane where the measuring system can measure accurately utilizing the ability of geometric conversion of slope of the triangular standard piece,the error data of un-equivalence and un-parallelism of light planes are obtained by CCD capture and mathematical calculation,and the measuring data are compensated according to the measured error data.An experiment verifies that the measuring accuracy can be improved by 40% as the structural errors of multi-linear structured light probe are compensated with the presented method.