Digital holography benefits from interferometric amplification, which enhances sensitivity. Coherence-gated digital holography allows for the suppression of noise sources such as multiple scattered photons and other light sources. In addition, digital holography provides access to optical phase information, which is an important metrological parameter for three-dimensional measurements. The aim of this study is to investigate the potential of digital holography as a new sensor concept for the environmental perception of autonomous vehicles under difficult visibility conditions. Our experiments are conducted using a 27-meter-long fog tube and serve in particular to characterize the capacity to effectively filter multiple scattered photons based on their coherence property. From the comparison between holography and time-of-flight (ToF) imaging, it follows that although the ballistic photon filtering works significantly better in ToF, the increase in sensitivity due to the interferometric amplification effect results in holography outperforming ToF. In addition, we combine these results with previous experiments and show the importance of the advantages of digital holography for environmental perception through scattering media.
Coherent fiber bundles with their small diameter (less than 300 microns) pave the way towards ultra-thin holographic endoscopes. However, holographic imaging through CFBs suffers from random phase distortions due to the light transport through the fiber cores. We use two-wavelength digital holography, exploiting spectral correlations to eliminate the detrimental effects introduced by the fibre bundle. We use two-photon-polymerization to print our micro optics directly onto both the imaging fiber bundle and illumination fiber. Using an off-axis holographic setup and two lasers we are able to perform single-shot 3D holographic shape measurement.
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