High-resolution light spot localization with photodiode arrays

Year: 1984

Authors: Bertani D., Cetica M., Ciliberto S., Francini F.

Autors Affiliation: Istituto Nazionale di Ottica, Largo E. Fermi 6, 50125 Firenze, Italy

Abstract: We describe two analog electronic techniques to determine the position of a light spot on a linear photodiode array by detecting its intensity peak or its centroid. The position was detected with an accuracy of 1 and 3.5 µm by the two methods, respectively, using a 16-µm center-to-center array. As an example, the displacement of a mirror was measured with a sensitivity of 0.05 µm.

Journal/Review: REVIEW OF SCIENTIFIC INSTRUMENTS

Volume: 55 (8)      Pages from: 1270  to: 1272

KeyWords: Semiconductor diodes, photodiode; Photodetectors
DOI: 10.1063/1.1137914

Citations: 8
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