Improving measurement accuracy over a wide range is very important for the measurement system based on four-quadrant detector (4QD). However, its measurement performance is easily affected by the energy distribution of the spot imaged on 4QD, which limits its wider practical application. Existing methods mainly use the collected data for curve fitting to improve the measurement accuracy. However, actual data collection may be difficult, and the spot energy distribution imaged on 4QD may change at any time. In this paper, an active method to improve the measurement accuracy of 4QD is proposed, which can adapt to the change of the spot energy distribution without additional actual data. Experimental results show that the proposed method can effectively improve the measurement accuracy over a wide range with fast detection speed.

在大范围内提高测量精度对于基于四象限检测器 (4QD) 的测量系统非常重要。然而，其测量性能容易受到 4QD 成像光斑能量分布的影响，限制了其更广泛的实际应用。现有方法主要是利用采集到的数据进行曲线拟合，以提高测量精度。然而，实际数据收集可能很困难，并且在 4QD 上成像的点能量分布可能随时发生变化。本文提出了一种提高4QD测量精度的主动方法，该方法无需额外的实际数据即可适应光斑能量分布的变化。实验结果表明，所提出的方法可以有效地提高大范围内的测量精度，检测速度快。