Dual-mode optical sensing: three-dimensional imaging and seeing around a corner

Martin Laurenzis, Andreas Velten und Jonathan Klein
In: Optical Engineering (2017)
 

Abstract

The application of nonline-of-sight (NLoS) vision and seeing around a corner has been demonstrated in the recent past on a laboratory level with round trip path lengths on the scale of 1 m as well as 10 m. This method uses a computational imaging approach to analyze the scattered information of objects which are hidden from the sensor’s direct field of view. A detailed knowledge about the scattering surfaces is necessary for the analysis. The authors evaluate the realization of dual-mode concepts with the aim of collecting all necessary information to enable both the direct three-dimensional imaging of a scene as well as the indirect sensing on hidden objects. Two different sensing approaches, laser gated viewing (LGV) and time-correlated single-photon counting, are investigated operating at laser wavelengths of 532 and 1545 nm, respectively. While LGV sensors have high spatial resolution, their application for NLoS sensing suffers from a low temporal resolution, i.e., a minimal gate width of 2 ns. On the other hand, Geiger-mode single-photon counting devices have high temporal resolution (250 ps), but the array size is limited to some thousand sensor elements. The authors present detailed theoretical and experimental evaluations of both sensing approaches.

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Bibtex

@ARTICLE{Laurenzis2017-1,
    author = {Laurenzis, Martin and Velten, Andreas and Klein, Jonathan},
     title = {Dual-mode optical sensing: three-dimensional imaging and seeing around a corner},
   journal = {Optical Engineering},
      year = {2017},
  abstract = {The application of nonline-of-sight (NLoS) vision and seeing around a corner has been demonstrated
              in the recent past on a laboratory level with round trip path lengths on the scale of 1 m as well as
              10 m. This method uses a computational imaging approach to analyze the scattered information of
              objects which are hidden from the sensor’s direct field of view. A detailed knowledge about the
              scattering surfaces is necessary for the analysis. The authors evaluate the realization of dual-mode
              concepts with the aim of collecting all necessary information to enable both the direct
              three-dimensional imaging of a scene as well as the indirect sensing on hidden objects. Two
              different sensing approaches, laser gated viewing (LGV) and time-correlated single-photon counting,
              are investigated operating at laser wavelengths of 532 and 1545 nm, respectively. While LGV sensors
              have high spatial resolution, their application for NLoS sensing suffers from a low temporal
              resolution, i.e., a minimal gate width of 2 ns. On the other hand, Geiger-mode single-photon
              counting devices have high temporal resolution (250 ps), but the array size is limited to some
              thousand sensor elements. The authors present detailed theoretical and experimental evaluations of
              both sensing approaches.}
}