Position-sensitive SiPMs are useful in all light detection applications requiring a small number of readout channels while preserving the information about the incoming light's interaction position. Focusing on a 2x2 array of LG-SiPMs covering an area of ∼15.5×15.5mm with just 6 readout channels, we proposed a quantitative method to evaluate image reconstruction performance. The method is based on a statistical approach to assess the device's precision (spatial resolution) and accuracy (linearity) in reconstructing the light spot center of gravity. This evaluation is achieved through a Rice probability distribution function fitting. We obtained an average sensor spatial resolution's best value of 81±3μm (standard deviation), which is achieved by reconstructing each position with the amplitude of the channels' output signals. The corresponding accuracy is 231±4μm.
@article{arxiv.2503.05450,
title = {Quantitative Determination of Spatial Resolution and Linearity of Position-Sensitive LG-SiPMs at Sub-Millimeter Scale via Ricean Distribution Fitting},
author = {Aramis Raiola and Fabio Acerbi and Cyril Alispach and Hossein Arabi and Domenico della Volpe and Alberto Gola and Habib Zaidi},
journal= {arXiv preprint arXiv:2503.05450},
year = {2025}
}