Micro Resolution Time-of-Flight Imaging with Super heterodyne Interferometry

Three dimensional imaging techniques have been widely used in both industry and academia. Time-of-flight (ToF) sensors offer a promising method of 3D imaging due to compact size and low complexity. However, state-of-the-art ToF  sensors only have depth resolutions of centimeters due to limitations in the modulation frequencies that can be used. In this paper, we propose a technique to generate modulation frequencies as high as 1 THz using optical super heterodyne interferometry. Our proposed system provides great  flexibility in imaging range and resolution. We experimentally demonstrate an increase in depth resolution by an order of magnitude relative to currently available commercial ToF cameras.


Micro Resolution Time-of-Flight Imaging

Fengqiang Li, Florian Willomitzer, P Rangarajan, Mohit Gupta, Andreas Velten, Oliver Cossairt

Proc. ICCP 2018

High-depth-resolution Range Imaging with Multiple-wavelength Superheterodyne Interferometry using 1550-nm Lasers

Fengqiang Li, Joshua Yablon, Andreas Velten, Mohit Gupta, Oliver Cossairt

Applied Optics 2017


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