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Optical Engineering

Deflectometry using portable devices
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Paper 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.

Paper Details

Date Published: 17 February 2015
PDF: 9 pages
Opt. Eng. 54(2) 025111 doi: 10.1117/1.OE.54.2.025111
Published in: Optical Engineering Volume 54, Issue 2
Show Author Affiliations
Guillaume P. Butel, College of Optical Sciences, The Univ. of Arizona (United States)
Greg A. Smith, College of Optical Sciences, The Univ. of Arizona (United States)
James H. H. Burge, College of Optical Sciences, The Univ. of Arizona (United States)


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