【摘要】 提出了一种长距离激光准直测量中的位置敏感探测器(PSD)空间三维非线性修正技术,研制了在三维空间内测量二维PSD非线性的自动标定系统。在长达78m的准直测量范围内,对二维PSD的非线性特性进行了标定实验,实验结果表明,PSD与激光源距离不同时,其非线性特性具有很明显不同。利用多层前馈神经网络建立了入射光实际位置与二维PSD输出坐标以及准直距离间的空间三维映射关系,进而对PSD的空间三维非线性进行修正。非线性修正后的PSD读数误差,在整个测量范围内表现为不大于±0.012mm的随机误差。更多还原

【Abstract】 A spatial 3-D nonlinear correction technique is put forward to correct the nonlinearity errors of the PSD in long distance laser collimating measurement.An automatic calibration system is developed to measure the nonlinearity of a 2-D PSD in 3-D space.The nonlinear characteristic of 2-D PSD is checked in a long collimating distance of 78 meters.The experimental results show that the nonlinearity of 2-D PSD is different evidently when the PSD element is at different position from the laser head.The spatial 3-D mapping relationship between the actual displacements of the incident light and the coordinates of 2-D PSD outputs is established by using a multilayer feedforward neural network and the nonlinear errors are corrected with this map.The readout errors of the PSD after correction are shown as random and no more than ±0.012 mm in the whole measuring distance.更多还原