Single-shot phase-measuring deflectometry for cornea measurement

Hanning Liang; Evelyn Olesch; Zheng Yang; Gerd Häusler

doi:10.1515/aot-2016-0049

Artikel

Single-shot phase-measuring deflectometry for cornea measurement

Hanning Liang
Hanning Liang, born 1989, is working as a scientific associate at the University of Applied Sciences Landshut. In 2011, she received her bachelor of Physics degree from the China University of Geoscience, Wuhan, and in 2011 her master degree in Physics from the University of Erlangen-Nuremberg. Her master thesis about cornea measurements with phase-measuring deflectometry was completed in the research group of Prof. Häusler. She is currently working on new applications of deflectometry.
, Evelyn Olesch
Evelyn Olesch is working as a PhD student at the University of Erlangen-Nuremberg, Institute of Optics, Information and Photonics, with Prof. Häusler. She got her diploma degree in Mathematics in 2008 from the University of Erlangen-Nuremberg. Her diploma thesis was about surface reconstruction from 2D gradient data. Her current fields of research are deflectometry, calibration, and simulation.
, Zheng Yang
Zheng Yang, born in 1982, received his BEng degree in Computer Science from University Hefei in 2005 and, subsequently, in 2009, his MSc degree in Optical Engineering/Photonics from the University of Applied Science Göttingen. His master thesis was conducted on a hand-held dental 3D-scanner in the research group of Prof. Häusler at the University of Erlangen-Nuremberg. Since 2010, he has been working as a PhD student in the same group in the field of high-speed 3D inspection, microdeflectometry, and calibration.
und Gerd Häusler
Gerd Häusler is a professor for Physics at the Institute of Optics, Information and Photonics, University of Erlangen-Nuremberg, Germany, where he started in 1974, working with Adolf Lohmann. His major interest is to ‘understand the fundamental physical and information theoretical limits of optical 3D-sensors’. Aiming for 3D-sensors working at these limits, he founded ‘3D-Shape GmbH’ (2001). Gerd Häusler published about 300 papers and more than 20 patents, among others: Fourier Domain OCT (‘Spectral Radar’), White Light Interferometry on Rough Surfaces (‘Coherence Radar’), and Phase Measuring Deflectometry (‘PMD’). He received the ‘Rudolf Kingslake Award’ of the SPIE, together with G. Ferrano (1981); he is EOS Fellow since 2012. From 1996 to 2010, he was a member of the executive board of the ‘German Society for Applied Optics’.

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Aus der Zeitschrift Advanced Optical Technologies Band 5 Heft 5-6

Abstract

Phase-measuring deflectometry (PMD) has become a standard tool to measure the topography of specular surfaces. We implemented PMD for the measurement of the human cornea topography, exploiting an earlier idea of Lingelbach et al. Two problems occur: a large angular dynamical range and a single-shot measurement are required. We solve these problems by an optimized geometry with minimal occlusion and by single sideband demodulation with a pre-distorted fringe pattern with optimal fringe period. An in vivo measurement of an astigmatic cornea displays a deviation from the medical diagnosis of only 0.15 D, which is within the medical quantization step of 0.25 D.

Keywords: corneal topography; metrology; three-dimensional sensing

About the authors

Hanning Liang

Hanning Liang, born 1989, is working as a scientific associate at the University of Applied Sciences Landshut. In 2011, she received her bachelor of Physics degree from the China University of Geoscience, Wuhan, and in 2011 her master degree in Physics from the University of Erlangen-Nuremberg. Her master thesis about cornea measurements with phase-measuring deflectometry was completed in the research group of Prof. Häusler. She is currently working on new applications of deflectometry.

Evelyn Olesch

Evelyn Olesch is working as a PhD student at the University of Erlangen-Nuremberg, Institute of Optics, Information and Photonics, with Prof. Häusler. She got her diploma degree in Mathematics in 2008 from the University of Erlangen-Nuremberg. Her diploma thesis was about surface reconstruction from 2D gradient data. Her current fields of research are deflectometry, calibration, and simulation.

Zheng Yang

Zheng Yang, born in 1982, received his BEng degree in Computer Science from University Hefei in 2005 and, subsequently, in 2009, his MSc degree in Optical Engineering/Photonics from the University of Applied Science Göttingen. His master thesis was conducted on a hand-held dental 3D-scanner in the research group of Prof. Häusler at the University of Erlangen-Nuremberg. Since 2010, he has been working as a PhD student in the same group in the field of high-speed 3D inspection, microdeflectometry, and calibration.

Gerd Häusler

Gerd Häusler is a professor for Physics at the Institute of Optics, Information and Photonics, University of Erlangen-Nuremberg, Germany, where he started in 1974, working with Adolf Lohmann. His major interest is to ‘understand the fundamental physical and information theoretical limits of optical 3D-sensors’. Aiming for 3D-sensors working at these limits, he founded ‘3D-Shape GmbH’ (2001). Gerd Häusler published about 300 papers and more than 20 patents, among others: Fourier Domain OCT (‘Spectral Radar’), White Light Interferometry on Rough Surfaces (‘Coherence Radar’), and Phase Measuring Deflectometry (‘PMD’). He received the ‘Rudolf Kingslake Award’ of the SPIE, together with G. Ferrano (1981); he is EOS Fellow since 2012. From 1996 to 2010, he was a member of the executive board of the ‘German Society for Applied Optics’.

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Received: 2016-9-6

Accepted: 2016-11-4

Published Online: 2016-12-8

Published in Print: 2016-12-1

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Artikel in diesem Heft

https://doi.org/10.1515/aot-2016-0049

Schlagwörter für diesen Artikel

corneal topography; metrology; three-dimensional sensing