Automated Optical Qualification Method for Position Sensitive Diodes

This study focuses on the automated optical qualification of a Position Sensitive Diode (PSD) concerning nonlinear distortion, a crucial process for ensuring the accuracy and reliability of PSDs in various applications. The method proposes a defined motion between PSD and a stationary laser spot, achieved by a hexapod. A comprehensive data acquisition process was conducted, which included recording measurements across equidistant positions along the x and y axes to provide a detailed assessment of the PSD’s performance. The results demonstrated that the measured distortion of the PSD aligns qualitatively with the theoretical expectations in literature, indicating the validity of the theoretical models used in predicting PSD behavior. The study concludes that the system is capable of automatically performing a qualification process for PSDs. The optical resolution and dynamic of PSDs make them suitable for use as calibration inputs for laser beam positioning systems, e.g., galvanometer scanner, and as sensory inputs for a closed-loop control of laser spot positions. This highlights the versatility and efficiency of PSDs in precision applications. 94 che Messtechnik Ricarda Kafka