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为了提高1 550 nm近红外波段光斑位置的检测精度,提出了一种改进的积分无穷解算模型。以高斯光斑为入射光模型,深入分析了In Ga As四象限探测器(Quadrant Detector,QD)输出信号与光斑实际位置之间的关系,考虑探测器直径及沟道的影响,通过引入误差补偿因子,利用最小二乘拟合的方法得到有效光斑半径,从而获得新解算模型的解析表达式,最后在搭建的In Ga As QD光斑位置检测系统上对提出模型进行实验验证。仿真和实验结果表明:新模型可有效降低不同半径光斑下的位置检测误差;入射光总能量约为10μW,光斑半径0.75 mm时,在[-0.75~0.75 mm]检测范围内,新模型均方根误差为0.003 mm,最大误差为0.009 mm,较原有模型分别降低了78.6%和52.6%。新模型在激光通信和激光雷达等工程实际中具有较好的应用前景。
In order to improve the detection accuracy of spot position in the 1 550 nm near infrared band, an improved integral infinite solution model is proposed. Taking Gaussian flare as incident light model, the relationship between the output signal of In GaAs quadrant detector (QD) and the actual position of flare is deeply analyzed. Considering the influence of detector diameter and channel, the error compensation factor , The radius of the effective spot is obtained by using the method of least square fitting, and the analytical expression of the new solution model is obtained. Finally, the proposed model is validated on the In Ga As QD spot position detection system. The simulation and experimental results show that the new model can effectively reduce the position detection error under different radius spots. When the total energy of incident light is about 10μW and the spot radius is 0.75 mm, within the range of [-0.75 ~ 0.75 mm] The root error is 0.003 mm and the maximum error is 0.009 mm, which is 78.6% and 52.6% lower than the original model respectively. The new model has good application prospects in engineering such as laser communication and laser radar.