Research on non-linearity correction of 2D-PSD

摘要

PSD(Position Sensitive Detector) is a kind of electrophotonic detector based on lateral photoeffect. PSD is widely used in non-contact measurement as it's highly sensitive to the position of incident light. But, it suffers from non-linearity because of nonuniform surface resistance which reduces the measuring precision and reliability. In this paper, The non-linear error of 2D-PSD(Two-dimensional PSD) is partly corrected using algorithm for duo-linear interpolation based on LabVIEW(Laboratory Virtual Instrument Engineering Workbench). The corrected result shows that the linearity of 2D-PSD is greatly improved without increasing the complexity of hardware. After the non-linearity correction, the usable area of PSD is extended and the precision of the measurement system is improved.