Manojlović Lazo M
Zrenjanin Technical College, Đorđa Stratimirovića 23, 23000 Zrenjanin, Serbia. lazo.manojlovic@vts‐zr.edu.rs
Appl Opt. 2011 Jul 10;50(20):3461-9. doi: 10.1364/AO.50.003461.
A quantitative theoretical analysis of the quadrant photodetector (QPD) sensitivity in position measurement is presented. The Gaussian light spot irradiance distribution on the QPD surface was assumed to meet most of the real-life applications of this sensor. As the result of the mathematical treatment of the problem, we obtained, in a closed form, the sensitivity function versus the ratio of the light spot 1/e radius and the QPD radius. The obtained result is valid for the full range of the ratios. To check the influence of the finite light spot radius on the interaxis cross talk and linearity, we also performed a mathematical analysis to quantitatively measure these types of errors. An optimal range of the ratio of light spot radius and QPD radius has been found to simultaneously achieve low interaxis cross talk and high linearity of the sensor.
本文对象限光电探测器（QPD）在位置测量中的灵敏度进行了定量理论分析。假设QPD表面的高斯光斑辐照度分布符合该传感器的大多数实际应用情况。通过对该问题的数学处理，我们以封闭形式得到了灵敏度函数与光斑1/e半径和QPD半径之比的关系。所得结果在该比例的整个范围内均有效。为了检验有限光斑半径对轴间串扰和线性度的影响，我们还进行了数学分析以定量测量这些类型的误差。已发现光斑半径与QPD半径之比的最佳范围，可同时实现传感器的低轴间串扰和高线性度。
