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We present a non-contact and non-invasive diffuse optical imaging system, based on an array of $32 \times 32$ single-photon avalanche diodes and time-to-digital converters, able to measure the time-of-flight of single photons, with 350-ps resolution. Measurements using continuous-wave (CW) and time-domain (TD) techniques demonstrate the possibility to identify the presence of absorbing inclusions...
Single-photon avalanche diodes (SPADs) emerged as the most suitable photodetectors for both single-photon counting and photon-timing applications. Different complementary metal-oxide-semiconductor (CMOS) devices have been reported in the literature, with quite different performance and some excelling in just few of them, but often at different operating conditions. In order to provide proper criteria...
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