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Your search keyword '"Lloyd-Hart, Michael"' showing total 6 results
Start Over Author "Lloyd-Hart, Michael" Topic optics
6 results on '"Lloyd-Hart, Michael"'

2. Optical Phasing Sensor

Author

Walker, Chanda Bartlett, Stahl, H. Philip, and Lloyd-Hart, Michael

Subjects
Optics
Abstract

This paper discusses the theory and early experimental results related to an optical phasing sensor created at Marshall Space Flight Center. The sensor is a combination of a Young's double slit experiment and a Hartmann sensor used to measure intersegment phase error of a segmented telescope or other optic. The techniques used are proven interferometric techniques and require simple mathematics. Speed and efficiency are goals of the device as well as measurement of the important central area of the segments. Early results are encouraging and show that it is likely that this technique is feasible in the lab and possibly in space.

Published
2001

3. Status of the PALM-3000 high-order adaptive optics system

Author

Christoph Baranec, Dean L. Palmer, Richard Dekany, Tuan N. Truong, Rick Burruss, John Angione, Khanh Bui, Mitchell Troy, Jeffry Zolkower, John Henning, Antonin Bouchez, Stephen R. Guiwits, Ernest Croner, J. Chris Shelton, J. Kent Wallace, Jennifer E. Roberts, David Hale, Ellerbroek, Brent L., Hart, Michael, Hubin, Norbert, Wizinowich, Peter L., Warren, Penny G., Marshall, Cheryl J., Tyson, Robert K., Lloyd-Hart, Michael, Heaney, James B., and Kvamme, E. Todd

Subjects
Wavefront, Physics, business.industry, First light, Wavefront sensor, Deformable mirror, law.invention, Telescope, Optics, Observatory, law, Adaptive optics, business, Remote sensing, Optical aberration
Abstract

The PALM-3000 upgrade to the Palomar Adaptive Optics system will deliver extreme adaptive optics correction to a suite of three infrared and visible instruments on the 5.1 meter Hale telescope. PALM-3000 uses a 3388-actuator tweeter and a 241-actuator woofer deformable mirror, a wavefront sensor with selectable pupil sampling, and an innovative wavefront control computer based on a cluster of 17 graphics processing units to correct wavefront aberrations at scales as fine as 8.1 cm at the telescope pupil using natural guide stars. Many components of the system, including the science instruments and a post-coronagraphic calibration wavefront sensor, have already been commissioned on the sky. Results from a laboratory testbed used to characterize the remaining new components and verify all interfaces are reported. Deployment to Palomar Observatory is planned August 2010, with first light expected in early 2011.

Published
2010

4. Optical design for the narrow field infrared adaptive optics system (NFIRAOS) petite on the thirty meter telescope

Author

Brian J. Bauman, Richard Dekany, Brent Ellerbroek, Donald T. Gavel, Tyson, Robert K., and Lloyd-Hart, Michael

Subjects
Physics, Wavefront, business.industry, Wavefront sensor, Deformable mirror, law.invention, Telescope, Tilt (optics), Optics, law, Extremely Large Telescope, business, Adaptive optics, Thirty Meter Telescope
Abstract

We describe an exploratory optical design for the Narrow Field InfraRed Adaptive Optics (AO) System (NFIRAOS) Petite, a proposed adaptive optics system for the Thirty Meter Telescope Project. NFIRAOS will feed infrared spectrograph and wide-field imaging instruments with a diffraction limited beam. The adaptive optics system will require multi-guidestar tomographic wavefront sensing (WFS) and multi-conjugate AO correction. The NFIRAOS Petite design specifications include two small 60 mm diameter deformable mirrors (DM's) used in a woofer/tweeter or multiconjugate arrangement. At least one DM would be a micro-electromechanical system (MEMS) DM. The AO system would correct a 10 to 30 arcsec diameter science field as well as laser guide stars (LGS's) located within a 60 arcsec diameter field and low-order or tip/tilt natural guide stars (NGS's) within a 60 arcsec diameter field. The WFS's are located downstream of the DM's so that they can be operated in true closed-loop, which is not necessarily a given in extremely large telescope adaptive optics design. The WFS's include adjustable corrector elements which correct the static aberrations of the AO relay due to field position and LGS distance height.

Published
2005

5. Adaptive optics for the Thirty Meter Telescope

Author

Brent Ellerbroek, Matthew C. Britton, J. Stoesz, Bruce Macintosh, Glen Herriot, Donald T. Gavel, Richard Dekany, Tyson, Robert K., Lloyd-Hart, Michael, and Tyson, Robert

Subjects
Wavefront, Physics, genetic structures, Spectrometer, business.industry, media_common.quotation_subject, Astrophysics::Instrumentation and Methods for Astrophysics, Field of view, Astrophysics::Cosmology and Extragalactic Astrophysics, eye diseases, law.invention, Telescope, Optics, law, Sky, Astrophysics::Solar and Stellar Astrophysics, Astrophysics::Earth and Planetary Astrophysics, business, Adaptive optics, Spectrograph, Astrophysics::Galaxy Astrophysics, Thirty Meter Telescope, Remote sensing, media_common
Abstract

Optics and Photonics 2005, July 31 - August 4, 2005, San Diego, California, United States, Series: Proceedings of SPIE; no. 5903

Published
2005

6. NFIRAOS: TMT facility adaptive optics with conventional DMs

Author

Jean-Pierre Véran, L. Saddlemyer, Richard Clare, T. J. Davidge, Malcolm Smith, Paul Hickson, David Andersen, Darren Erickson, I. P. Powell, Brent Ellerbroek, Glen Herriot, Tyson, Robert K., Lloyd-Hart, Michael, and Tyson, Robert

Subjects
Physics, genetic structures, business.industry, Astrophysics::Instrumentation and Methods for Astrophysics, Field of view, Astrophysics::Cosmology and Extragalactic Astrophysics, eye diseases, Deformable mirror, law.invention, Telescope, Optics, law, Astrophysics::Solar and Stellar Astrophysics, sense organs, Astrophysics::Earth and Planetary Astrophysics, Guide star, Secondary mirror, Adaptive optics, business, Spectrograph, Astrophysics::Galaxy Astrophysics, Thirty Meter Telescope, Remote sensing
Abstract

Optics and Photonics 2005, 2005, San Diego, California, United States, Series: Proceedings of SPIE; no. 5903

Published
2005

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