Co-axial depth map sensor with an extended depth range

Mohan Xu, Hong Hua

Research output: Chapter in Book/Report/Conference proceedingConference contribution


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.

Original languageEnglish (US)
Title of host publicationOptical Design Challenge 2019
EditorsChristophe Peroz, Bernard C. Kress
ISBN (Electronic)9781510627468
StatePublished - 2019
EventOptical Design Challenge 2019 - San Francisco, United States
Duration: Feb 3 2019 → …

Publication series

NameProceedings of SPIE - The International Society for Optical Engineering
ISSN (Print)0277-786X
ISSN (Electronic)1996-756X


ConferenceOptical Design Challenge 2019
Country/TerritoryUnited States
CitySan Francisco
Period2/3/19 → …


  • 3D camera
  • Depth map sensor
  • controlled aberration
  • extended depth range
  • focus tunable lens

ASJC Scopus subject areas

  • Electronic, Optical and Magnetic Materials
  • Condensed Matter Physics
  • Computer Science Applications
  • Applied Mathematics
  • Electrical and Electronic Engineering


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