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27 February 2019 Co-axial depth map sensor with an extended depth range
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Abstract
The conventional depth map sensors have limited depth range, or they need to sacrifice depth accuracy for a larger working range. To overcome such problems, in this work, we propose a co-axial depth map sensor with an extended depth range based on controlled aberrations. This depth map sensor implements depth measurement by projecting a near-infrared astigmatic pattern onto the test scene and measuring the contrast change of the reflected pattern image in the tangential and sagittal directions. By adding a tunable lens in the projection optics, this depth map sensor can achieve the extended depth measurement without the loss of high depth accuracy and high depth map resolution.
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Mohan Xu and Hong Hua "Co-axial depth map sensor with an extended depth range", Proc. SPIE 11040, Optical Design Challenge 2019, 1104003 (27 February 2019); https://doi.org/10.1117/12.2523653
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KEYWORDS
Imaging systems

Image sensors

Lens design

Projection systems

Digital micromirror devices

Beam splitters

Near infrared

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