Time-correlated single-photon counting (TCSPC) has been established as the preferred choice of detection for high resolution depth profiling in challenging scenarios due to its excellent surface to surface resolution and high optical sensitivity. This presentation will describe several transceiver systems for underwater imaging based on a range of CMOS silicon single photon avalanche diode (Si-SPAD) detector arrays. Laboratory based experiments and field trials were conducted in several scattering underwater environments, demonstrating imaging up to 7.5 attenuation lengths and ranging up to 14 attenuation lengths when using average optical power up to 50 mW.
Time-correlated single-photon counting (TCSPC) has been established as the preferred choice of detection for high resolution depth profiling due to its excellent surface to surface resolution and high optical sensitivity. This presentation will describe an underwater transceiver system based on a planar CMOS silicon single photon avalanche diode (Si-SPAD) detector array, and interfaced with a graphics processing unit (GPU) for real time processing capabilities with video rates up to 25 Hz. Depth and intensity profiles of stationary and moving targets were acquired with the transceiver fully submerged in scattering water, equivalent up to 7.5 attenuation lengths.
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