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arXiv · 2503.05450

Quantitative Determination of Spatial Resolution and Linearity of Position-Sensitive LG-SiPMs at Sub-Millimeter Scale via Ricean Distribution Fitting

Aramis Raiola·Fabio Acerbi·Cyril Alispach·Hossein Arabi·Domenico della Volpe·Alberto Gola·Habib Zaidi
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Abstract

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 $\sim 15.5 \times 15.5~\rm{mm}$ 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 $81 \pm 3~\rm{\mu m}$ (standard deviation), which is achieved by reconstructing each position with the amplitude of the channels' output signals. The corresponding accuracy is $231 \pm 4~\rm{\mu m}$.

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Aramis Raiola, Fabio Acerbi, Cyril Alispach, Hossein Arabi, Domenico della Volpe, Alberto Gola, Habib Zaidi. 2025-03-07. Quantitative Determination of Spatial Resolution and Linearity of Position-Sensitive LG-SiPMs at Sub-Millimeter Scale via Ricean Distribution Fitting. https://arxiv.org/abs/2503.05450

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