Deflectometry using portable devices

Guillaume P. Butel, Gregory A Smith, James H Burge

Research output: Contribution to journalArticle

9 Scopus citations

Abstract

Deflectometry is a powerful metrology technique that uses off-the-shelf equipment to achieve nanometer-level accuracy surface measurements. However, there is no portable device to quickly measure eyeglasses, lenses, or mirrors. We present an entirely portable new deflectometry technique that runs on any Android™ smartphone with a front-facing camera. Our technique overcomes some specific issues of portable devices like screen nonlinearity and automatic gain control. We demonstrate our application by measuring an amateur telescope mirror and simulating a measurement of the faulty Hubble Space Telescope primary mirror. Our technique can, in less than 1 min, measure surface errors with accuracy up to 50 nm RMS, simply using a smartphone.

Original languageEnglish (US)
Article number141532
JournalOptical Engineering
Volume54
Issue number2
DOIs
Publication statusPublished - Feb 1 2015

    Fingerprint

Keywords

  • amateur mirror
  • Android™
  • deflectometry
  • Hubble Space Telescope
  • mobile

ASJC Scopus subject areas

  • Atomic and Molecular Physics, and Optics
  • Engineering(all)

Cite this