Dr. Donald Bruns Profile

Dr. Donald Bruns

Senior Scientist at Stellar Products

SPIE Involvement:

Author

Publications (18)

Proceedings Article | 24 August 2010 Paper

Portable daytime differential image motion sensor for atmospheric turbulence characterization

M. Belen'kii, T. Brinkley, D. Bruns, L. DiRuscio, H. Runyeon, V. Rye, L. Angell, D. Haddock, S. Hammel, M. Lasher

Proceedings Volume 7814, 78140J (2010) https://doi.org/10.1117/12.860925

KEYWORDS: Telescopes, Stars, Signal to noise ratio, Cameras, Image sensors, Sensors, Short wave infrared radiation, Infrared telescopes, Software development, Error analysis

Read Abstract +

Proceedings Article | 25 September 2007 Paper

Laboratory demonstration of wavefront-based stochastic parallel gradient descent adaptive optics system

Mikhail Belen'kii, Jeff Barchers, Eric Berg, Don Bruns, Deborah Fung, Richard Gallant, Clay Kirk, Hope Runyeon, Vincent Rye, Josh Voass

Proceedings Volume 6708, 67080I (2007) https://doi.org/10.1117/12.734309

KEYWORDS: Adaptive optics, Turbulence, Thermal blooming, Beam controllers, Cameras, Control systems, Aluminum, Beam splitters, Wave propagation, Dynamical systems

Read Abstract +

A laboratory demonstration of two novel tactical beam control methods for correcting the effects of strong turbulence including Beacon Anisoplanatism, and the combined effects of Beacon Anisoplanatism and Thermal Blooming, respectively, were performed in SAIC's Tactical Beam Control Test-Bed. Both systems were tested with ratio of aperture diameter to Fried parameter, D/r₀, of up to 7, and ratio of beam spot size at the target to isoplanatic angle, θ_B/θ_o, of up to 10. The first method was implemented in a Wavefront-based Stochastic Parallel Gradient Decent (WSPGD) adaptive optics (AO) system, which uses an off-axis wavefront sensor (WFS) to provide feedback for a multi-dithering beam control algorithm. The second method was implemented in a Hybrid WSPGD AO system, which incorporates the WSPGD AO system with a conventional Phase Conjugate (PC) AO system. The Hybrid system uses an on-axis WFS to generate initial deformable mirror commands and an off-axis WFS to generate additional commands that account for the high frequency phase components removed from the wavefront of a laser return by Beacon Anisoplanatism. We developed a low speed PC-based WSPGD controller, implemented designs of the WSPGD and Hybrid WSPGD AO systems in SAIC's Test-Bed, and tested both AO systems in static and dynamic turbulence over a wide range of turbulence conditions. A target-plane tracker was used to stabilize the line-of-sight in the AO corrected beam. Test results show that the WSPGD AO system efficiently compensates the effects of Beacon Anisoplanatism for both static and dynamic turbulence, providing a mean performance gain of 1.8 averaged over multiple turbulent realizations. We also found in testing that the Hybrid WSPGD system efficiently compensates for Beacon Anisoplanatism in the presence of Thermal Blooming - providing improved compensation for both Thermal Blooming and turbulence. In the presence of strong Beacon Anisoplanatism with θ_B/θ_o of up to 10, the maximum performance gain is 4.9 and the mean performance gain for multiple turbulence realizations is 2.1.

Proceedings Article | 25 September 2007 Paper

Turbulence inner scale sensor for arbitrary atmospheric paths

Mikhail Belen'kii, Don Bruns, Kevin Hughes, Laura Moyer, Vincent Rye, Larry Wright

Proceedings Volume 6709, 67090J (2007) https://doi.org/10.1117/12.732675

KEYWORDS: Point spread functions, Turbulence, Stars, Atmospheric propagation, Sensors, Telescopes, Atmospheric optics, Scintillation, Atmospheric sensing, Signal to noise ratio

Read Abstract +

Proceedings Article | 27 December 2001 Paper

Measurements of geosynchronous-satellite spectral brightness due to solar illumination

Lawrence Sverdrup, Donald Bruns, Timothy Brinkley, Allen Olson, Jerry Oldenettel, Paul Fairchild

Proceedings Volume 4490, (2001) https://doi.org/10.1117/12.455427

KEYWORDS: Satellites, Stars, Calibration, Visualization, Telescopes, Charge-coupled devices, Sun, Earth's atmosphere, Satellite imaging, Optical filters

Read Abstract +

Proceedings Article | 23 July 1999 Paper

National Ignition Facility (NIF) wavefront control system

Richard Zacharias, Erlan Bliss, Mark Feldman, Andrew Grey, Mark Henesian, Jeffrey Koch, Janice Lawson, Richard Sacks, J. Thaddeus Salmon, John Toeppen, Lewis Van Atta, Scott Winters, Bruce Woods, Carlo Lafiandra, Donald Bruns

Proceedings Volume 3492, (1999) https://doi.org/10.1117/12.354181

KEYWORDS: Wavefronts, National Ignition Facility, Control systems, Sensors, Actuators, Deformable mirrors, Mirrors, Wavefront sensors, Control systems design, Near field optics

Read Abstract +

Proceedings Article | 11 September 1998 Paper

Infrared adaptive optics system for the 6.5-m MMT: system status and prototype results

Michael Lloyd-Hart, James Roger Angel, David Sandler, Todd Barrett, Patrick McGuire, Troy Rhoadarmer, Donald Bruns, Stephen Miller, Donald McCarthy, Matthew Cheselka

Proceedings Volume 3353, (1998) https://doi.org/10.1117/12.321743

KEYWORDS: Mirrors, Telescopes, Actuators, Adaptive optics, Infrared radiation, Stars, Sensors, Prototyping, Infrared imaging, Sodium

Read Abstract +

Proceedings Article | 11 September 1998 Paper

Adaptive secondary mirror for the 6.5-m MMT

Todd Barrett, Donald Bruns, Timothy Brinkley, David Sandler, Bruce Fitz-Patrick, Troy Rhoadarmer

Proceedings Volume 3353, (1998) https://doi.org/10.1117/12.321623

KEYWORDS: Actuators, Mirrors, Prototyping, Sensors, Glasses, Servomechanisms, Control systems, Manufacturing, Observatories, Electromagnetism

Read Abstract +

Proceedings Article | 11 September 1998 Paper

Adaptive secondary mirror for the 6.5-m MMT

Todd Barrett, Donald Bruns, Timothy Brinkley, David Sandler, Bruce Fitz-Patrick, James Roger Angel, Troy Rhoadarmer

Proceedings Volume 3353, (1998) https://doi.org/10.1117/12.321692

KEYWORDS: Actuators, Mirrors, Prototyping, Sensors, Glasses, Servomechanisms, Control systems, Observatories, Electromagnetism, Manufacturing

Read Abstract +

Proceedings Article | 11 September 1998 Paper

Thermal characterization of the support plate for the 6.5-m MMT thin-shell adaptive secondary mirror

Troy Rhoadarmer, Michael Lloyd-Hart, Bruce Fitz-Patrick, Matthew Rademacher, Donald Bruns, J. Shelton

Proceedings Volume 3353, (1998) https://doi.org/10.1117/12.321642

KEYWORDS: Actuators, Sensors, Mirrors, Aluminum, Electronics, Cooling systems, Telescopes, Prototyping, Adaptive optics, Surface finishing

Read Abstract +

Proceedings Article | 17 October 1997 Paper

Final prototype design for the adaptive secondary mirror of the 6.5-m MMT

Donald Bruns, Todd Barrett, Timothy Brinkley, Domingo Goyena, David Sandler, Hubert Martin, Guido Brusa, James Roger Angel

Proceedings Volume 3126, (1997) https://doi.org/10.1117/12.290145

KEYWORDS: Actuators, Capacitors, Glasses, Prototyping, Sensors, Mirrors, Aluminum, Position sensors, Electronics, Electrodes

Read Abstract +

Proceedings Article | 21 March 1997 Paper

Performance of a magnetic driven tip-tilt mirror

Jacopo Farinato, Simone Esposito, Enrico Marchetti, Roberto Ragazzoni, Donald Bruns

Proceedings Volume 2871, (1997) https://doi.org/10.1117/12.268980

KEYWORDS: Mirrors, Analog electronics, Sensors, Control systems, Magnetism, Prototyping, Adaptive optics, Capacitance, Actuators, Fourier transforms

Read Abstract +

Proceedings Article | 21 March 1997 Paper

MMT adaptive secondary mirror prototype performance

Donald Bruns, Todd Barrett, David Sandler, Guido Brusa-Zappellini, Hubert Martin, James Roger Angel

Proceedings Volume 2871, (1997) https://doi.org/10.1117/12.268969

KEYWORDS: Actuators, Mirrors, Prototyping, Glasses, Adaptive optics, Capacitors, Sensors, Telescopes, Manufacturing, Electronics

Read Abstract +

Proceedings Article | 14 October 1996 Paper

New dual-aperture telescope for the Mt. Evans observatory

Eric Meyer, Robert Stencel, Donald Bruns

Proceedings Volume 2828, (1996) https://doi.org/10.1117/12.254196

KEYWORDS: Telescopes, Mirrors, Observatories, Space telescopes, Cameras, Adaptive optics, Infrared telescopes, Stars, Infrared spectroscopy, Wavefronts

Read Abstract +

Proceedings Article | 25 August 1995 Paper

FASTTRAC II near-IR adaptive optics system for the Multiple Mirror Telescope: description and preliminary results

Peter Gray, Michael Lloyd-Hart, James Roger Angel, Donald McCarthy, David Sandler, Ty Martinez, Laird Close, Guido Brusa-Zappellini, Donald Bruns, Brian McLeod, Patrick Ryan, Todd Groesbeck, David Wittman, Bruce Jacobsen, John Hughes, Mark Hunten, Matthew Cheselka

Proceedings Volume 2534, (1995) https://doi.org/10.1117/12.217726

KEYWORDS: Telescopes, Mirrors, Cameras, Adaptive optics, Stars, Actuators, Sensors, Charge-coupled devices, Relays, Optical components

Read Abstract +

Proceedings Article | 25 August 1995 Paper

6.5-m MMT infrared adaptive optics system: detailed design and progress report

David Sandler, Michael Lloyd-Hart, Ty Martinez, Peter Gray, James Roger Angel, Todd Barrett, Donald Bruns, Steven Stahl

Proceedings Volume 2534, (1995) https://doi.org/10.1117/12.217754

KEYWORDS: Mirrors, Infrared imaging, Infrared radiation, Sensors, Sodium, Wavefronts, Stars, Infrared sensors, Optical instrument design, Infrared detectors

Read Abstract +

Proceedings Article | 25 August 1995 Paper

Design and prototype tests of an adaptive secondary mirror for the new 6.5-m single-mirror MMT

Donald Bruns, David Sandler, Hubert Martin, Guido Brusa-Zappellini

Proceedings Volume 2534, (1995) https://doi.org/10.1117/12.217731

KEYWORDS: Actuators, Mirrors, Prototyping, Glasses, Capacitors, Sensors, Capacitance, Distance measurement, Telescopes, Position sensors

Read Abstract +

Proceedings Article | 25 August 1995 Paper

Adaptive beam-combining mirror for the MMT

Laird Close, Guido Brusa-Zappellini, Donald Bruns, Michael Lloyd-Hart, Donald McCarthy

Proceedings Volume 2534, (1995) https://doi.org/10.1117/12.217729

KEYWORDS: Mirrors, Sensors, Capacitors, Actuators, Cameras, Stars, Wavefront sensors, Telescopes, Observatories, Infrared radiation

Read Abstract +

Proceedings Article | 31 May 1994 Paper

Five-order correction adaptive optics system for meter-class telescopes

Donald Bruns, Eric Meyer

Proceedings Volume 2201, (1994) https://doi.org/10.1117/12.176015

KEYWORDS: Telescopes, Adaptive optics, Wavefronts, Data transmission, Astronomy, Actuators, Wavefront sensors, Calibration, Charge-coupled devices, Mirrors

Read Abstract +

Showing 5 of 18 publications

View contact details

UPDATE YOUR PROFILE

Is this your profile? Update it now.

Sign into your SPIE.org account

Don’t have a profile and want one?

Create an account on SPIE.org

Keywords/Phrases

Search In:

Publication Years