Mr. William Messner Profile

William Messner

Senior Systems Design Engineer at QED Technologies, Inc.

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Publications (13)

Proceedings Article | 30 November 2023 Presentation + Paper

Process optimization for high removal rates with MRF

William Messner, Christopher Hall

Proceedings Volume 12778, 127780D (2023) https://doi.org/10.1117/12.2690855

KEYWORDS: Polishing, Magnetorheological finishing, Nozzles, Design and modelling, Windows, Precision optics, Optical surfaces, Surface finishing, Spatial frequencies

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Proceedings Article | 28 October 2021 Presentation + Paper

High removal rate MRF

William Messner, Christopher Hall

Proceedings Volume 11889, 118891E (2021) https://doi.org/10.1117/12.2602803

KEYWORDS: Magnetorheological finishing, Polishing, Magnetism, Aspheric lenses, Head, Surface finishing, Spherical lenses, Optics manufacturing, Silica, Precision optics

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Proceedings Article | 15 November 2019 Presentation + Paper

Extending magnetorheological finishing to address short radius concave surfaces and mid-spatial frequency errors

Chris Maloney, William Messner

Proceedings Volume 11175, 111750N (2019) https://doi.org/10.1117/12.2536920

KEYWORDS: Magnetorheological finishing, Optics manufacturing, Surface finishing, Polishing, Precision optics, Optical design, Spatial frequencies

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Proceedings Article | 16 October 2017 Paper

Applying MRF to errors caused by optical and opto-mechanical assembly

Christopher Hall, Bill Messner, Mike DeMarco

Proceedings Volume 10448, 104480K (2017) https://doi.org/10.1117/12.2279890

KEYWORDS: Magnetorheological finishing, Polishing, Surface finishing, Wavefronts, Optical design, Magnetism, Mirrors, Optical coatings, Assembly tolerances, Optics manufacturing

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Proceedings Article | 21 September 2007 Paper

Manufacturing meter-scale aspheric optics

W. Messner, C. Hall, P. Dumas, B. Hallock, M. Tricard, Stephen O'Donohue, S. Miller

Proceedings Volume 6671, 667106 (2007) https://doi.org/10.1117/12.734175

KEYWORDS: Polishing, Magnetorheological finishing, Surface finishing, Optics manufacturing, Aspheric lenses, Aspheric optics, Optical testing, Mirrors, Metrology, Astronomical imaging

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Proceedings Article | 14 May 2007 Paper

Magnetorheological Finishing of freeform optics

Christopher Hall, Andrew Jones, Bill Messner, Bob Hallock

Proceedings Volume 10316, 103160J (2007) https://doi.org/10.1117/12.719886

KEYWORDS: Polishing, Optical spheres, Raster graphics, Surface finishing, Magnetorheological finishing, Freeform optics, Photovoltaics, Aspheric lenses, Spindles, Optical design

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Proceedings Article | 2 May 2007 Paper

Improvements in large window and optics production

Bob Hallock, Bill Messner, Chris Hall, Chris Supranowitz

Proceedings Volume 6545, 654519 (2007) https://doi.org/10.1117/12.719864

KEYWORDS: Magnetorheological finishing, Polishing, Surface finishing, Aspheric lenses, Sapphire, Metrology, Wavefronts, Optical spheres, Aspheric optics, Optics manufacturing

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Fabrication of large optics has been a topic of discussion for decades. As early as the late 1980s, computer-controlled equipment has been used to semi-deterministically correct the figure error of large optics over a number of process iterations. Magnetorheological Finishing, MRF®, was developed and commercialized in the late 1990's to predictably and reliably allow the user to achieve deterministic results on a variety of optical glasses, ceramics and other common optical materials. Large and small optics such as primary mirrors, conformal optics and off-axis components are efficiently fabricated using this approach. More recently, specific processes, MR Fluids and equipment have been developed and implemented to enhance results when finishing large aperture sapphire windows. MRF, by virtue of its unique removal process, overcomes many of the drawbacks of a conventional polishing process. For example, lightweighted optics often exhibit a quilted pattern coincident with their pocket cell structure following conventional pad-based polishing. MRF does not induce mid-frequency errors and is capable of removing existing quilt patterns. Further, odd aperture shapes and part geometries which can represent significant challenges to conventional polish processing are simply and easily corrected with MRF tools. Similarly, aspheric optics which can often present multiple obstacles-particularly when lightweighted and off-axis−typically have a departure from best-fit sphere that is not well matched with to static pad-based polishing tools resulting in pad misfit and associated variations in removal. The conformal subaperture polishing tool inherent to the QED process works as well on typical circular apertures as it does on irregular shapes such as rectangles, petals and trapezoids for example and matches the surface perfectly at all points. Flats, spheres, aspheres and off-axis sections are easily corrected. The schedule uncertainties driven by edge roll and edge control are virtually eliminated with the MRF process. This paper presents some recent results of the deterministic finishing typified by the QED product line and more specifically of its large-aperture machines, presently capable of finishing optics up to one meter in size. Examples of large sapphire windows and meter-class aspheric glass optics will be reviewed. Associated metrology concerns will also be discussed.

Proceedings Article | 18 September 2000 Paper

Ultrahigh-performance optical servo system using an electro-optic beam scanner

Bo Gong, William Messner, Tuviah Schlesinger, Hadas Shragai, Daniel Stancil, Jinhui Zhai

Proceedings Volume 4090, (2000) https://doi.org/10.1117/12.399375

KEYWORDS: Scanners, Control systems, Actuators, Electro optics, Servomechanisms, Laser scanners, 3D scanning, Optical storage, Ultrafast phenomena, Data storage

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Proceedings Article | 2 July 1999 Paper

Improved position and velocity encoder resolution using an electro-optic beam scanner

William Messner, Tuviah Schlesinger, Daniel Stancil

Proceedings Volume 3787, (1999) https://doi.org/10.1117/12.351646

KEYWORDS: Scanners, Electro optics, Computer programming, Sensors, Photodetectors, Light sources, Diffraction gratings, Diffraction, Doppler effect, Refraction

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Proceedings Article | 2 July 1999 Paper

Electro-optic scanner for optical disk fine tracking system

Jinhui Zhai, Steve Schroeck, Yuhong Huang, William Messner, Daniel Stancil, Tuviah Schlesinger

Proceedings Volume 3787, (1999) https://doi.org/10.1117/12.351645

KEYWORDS: Actuators, Scanners, Optical tracking, Servomechanisms, Optical discs, Sensors, Objectives, Electro optics, Digital signal processing, Switching

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Proceedings Article | 28 June 1999 Paper

Electro-optic scanner for an optical head fine actuator

Jinhui Zhai, Yuhong Huang, Steve Schroeck, William Messner, Tuviah Schlesinger, Daniel Stancil

Proceedings Volume 3864, 386428 (1999) https://doi.org/10.1117/12.997629

KEYWORDS: Scanners, Head, Optical tracking, Servomechanisms, Actuators, Digital signal processing, Electro optics, Objectives, Control systems, Data storage

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Proceedings Article | 2 January 1998 Paper

Virtual vehicle: parcel manipulation and dynamics with a distributed actuator array

Jonathan Luntz, William Messner, Howie Choset

Proceedings Volume 3201, (1998) https://doi.org/10.1117/12.298009

KEYWORDS: Actuators, Mechanical engineering

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Proceedings Article | 15 January 1996 Paper

Survey of digital tape transport servo systems

Priyadarshee Mathur, William Messner

Proceedings Volume 2604, (1996) https://doi.org/10.1117/12.230064

KEYWORDS: Head, Servomechanisms, Scanners, Data storage, Feedback control, Signal processing, Magnetism, Computing systems, Magnetic tracking, Systems modeling

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Showing 5 of 13 publications

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