Underwater single photon 3D imaging with millimeter depth accuracy and reduced blind range

Area of Science:

• Photonics
• Optical Imaging
• Underwater Sensing

Background:

• Mono-static systems offer flexibility but suffer from backreflection-induced photon count loss.
• This count loss creates a range-blind effect, hindering accurate target depth acquisition.
• Existing methods struggle with efficient target detection in challenging underwater environments.

Purpose of the Study:

• To reduce photon count loss in underwater mono-static single-photon imaging.
• To mitigate the range-blind effect and enhance target depth accuracy.
• To improve overall target detection efficiency in underwater scenarios.

Main Methods:

• Introduction of a polarization-based underwater mono-static single-photon imaging technique.
• Exploitation of light's polarization characteristics to minimize target photon count loss.
• Application of a non-local pixel correlations algorithm for target profile reconstruction.

Main Results:

• Significant reduction in photon count loss compared to unpolarized systems.
• Successful visual identification of target profiles, which were undetectable with unpolarized methods.
• Achieved millimeter-level ranging precision, demonstrating enhanced depth acquisition capabilities.

Conclusions:

• The polarization-based method effectively reduces count loss and range-blindness in mono-static single-photon imaging.
• This technique significantly improves target detection efficiency and ranging precision in underwater environments.
• The developed method enables robust target profile reconstruction and depth measurement.