Optical Design and Engineering

Deflectometry using portable devices

[+] Author Affiliations
Guillaume P. Butel, Greg A. Smith, James H. Burge

University of Arizona, College of Optical Sciences, 1630 East University Boulevard, Tucson, Arizona 85721, United States

Opt. Eng. 54(2), 025111 (Feb 17, 2015). doi:10.1117/1.OE.54.2.025111
History: Received October 3, 2014; Accepted January 16, 2015
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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.

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© 2015 Society of Photo-Optical Instrumentation Engineers

Citation

Guillaume P. Butel ; Greg A. Smith and James H. Burge
"Deflectometry using portable devices", Opt. Eng. 54(2), 025111 (Feb 17, 2015). ; http://dx.doi.org/10.1117/1.OE.54.2.025111


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