Wave front sensor based on digital mirror matrix for functional characterization of freeform ophthalmic optics / Stephan Stürwald.

Format:

Book

Author/Creator:

Stürwald, Stephan, author.

Series:

Ergebnisse aus der Produktionstechnik ; Band 21/2015

Language:

English

Subjects (All):

Ultrasonic waves--Measurement.

Ultrasonic waves.

Ultrasonic waves--Safety measures.

Physical Description:

1 online resource (154 p.)

Edition:

1. Auflage.

Place of Publication:

Aachen, [Germany] : Apprimus Verlag, 2015.

Language Note:

English

Summary:

In dieser Arbeit wird die Entwicklung und Charakterisierung eines Wellenfrontmesssystems für Gleitsichtbrillengläser beschrieben. Es ermöglicht eine quantitative Messung der Wellenfront bis zu 65 mm Durchmesser mit einer lateralen Auflösung von besser als die erforderlichen 1mm für die Inline-Qualitätskontrolle in der Produktion. Das realisierte Low-Cost System ist für Wellenfrontsteigungen mit einer sphärischen Abweichung von ± 2 Grad konzipiert und eröffnet eine flexible funktionale Prüfung von optischen Systemen und Freiformoptiken.

Contents:

Summary; Contents; 1. Introduction; 2. Theory; 2.1. Wave Front Measurement; 2.2. Working Principle of a Shack-Hartmann Sensor; 2.3. Optical Sensors; 2.3.1. Lateral Effect Diodes; 2.3.2. CCD and CMOS Sensors; 2.3.3. Comparison of Technologies; 2.4. Micromirror Technology; 2.5. Diffraction; 2.5.1. Transmission Grating; 2.5.2. Blazed Grating; 2.6. Numeric reconstruction of complex wavefronts; 2.6.1. Numeric propagation of complex object waves; 2.6.2. Adaption of reconstruction methods; 2.7. Radon transform; 2.7.1. Example; 2.7.2. Applications of the Radon transform in image processing

2.8. Hough Line transform3. State of the Art; 3.1. Measurements of varifocals; 3.2. Wave Front Measurement; 3.3. DMD-based Wave Front Sensor; 3.4. Required specifications of new systems; 4. Development of experimental setup; 4.1. Light Source; 4.2. Beam shaping; 4.3. Test Lenses; 4.4. Telescope optics; 4.5. Collimating calibration optics; 4.6. Digital Micromirror Matrix (DMD); 4.7. Detector Optics; 4.8. Detector; 4.9. Optomechanical Setup; 4.10. Controlling of hardware; 4.11. Software and Graphical User Interface; 5. Experimental investigations and characterization of the overall system

5.1. Characterization of the PSD5.1.1. Analysis with nano positioning system; 5.1.2. Evaluation of the measurements and calculation of a correction polynomial; 5.2. Characterization of telescope; 5.2.1. Measurement of the wavefront error; 5.2.2. Simulation of the telescope wavefront error; 5.2.3. Simulation of the optical distortion; 5.3. Characterization of the calibration optic; 5.4. Investigations on DMD diffraction effects; 5.4.1. Experimental analysis with a camera; 5.4.2. Modeling of the DMD as a three dimensional blazed grating; 5.4.3. Simulation of diffraction effects

5.4.4. Experimental diffraction efficiency as function of wavelength5.5. Measurement characteristics of the complete system; 5.5.1. Lateral resolution; 5.5.2. Measurement speed and length; 5.5.3. Error compensation for PSD related to diffraction patterns; 5.6. Theoretical measurement uncertainty; 5.7. Calibration of the system; 5.8. Sample measurement; 5.9. Focus point identification in digital images; 5.9.1. Algorithms for the focus point evaluation; 5.9.2. Evaluation of the algorithms; 5.10. Compensation of diffraction effects for application of PSD-detectors

5.11. Experimental measurement uncertainty6. Summary; 7. Prospects; 8. Acknowledgements; Bibliography; A. Appendix; A.1. Construction schematics; A.1.1. Photos of system and optical setup; A.1.2. Super continuum light source; A.1.3. Zernike Polynoms; A.1.4. Forbes Polynomials; List of Figures; List of Tables

Notes:

Description based upon print version of record.

Includes bibliographical references.

Description based on online resource; title from PDF title page (ebrary, viewed July 10, 2015).

ISBN:

9783863593322

3863593324