Dr. Jean-Noel Aubrun Profile

Dr. Jean-Noel Aubrun

at Marjan Research

SPIE Involvement:

Author

Publications (12)

Proceedings Article | 23 June 2006 Paper

Design of a prototype primary mirror segment positioning actuator for the Thirty Meter Telescope

Kenneth Lorell, Jean-Noël Aubrun, Robert Clappier, Scott Miller, Mark Sirota

Proceedings Volume 6267, 62672T (2006) https://doi.org/10.1117/12.672917

KEYWORDS: Actuators, Mirrors, Control systems, Telescopes, Prototyping, Electronics, Position sensors, James Webb Space Telescope, Astronomy, Thirty Meter Telescope

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Proceedings Article | 5 March 2003 Paper

Development and demonstration of a precision latch for deployable optical systems

Alain Carrier, Jean-Noel Aubrun, Patrick Champagne, Craig Hom, Kenneth Lorell, Roger Mihara

Proceedings Volume 4850, (2003) https://doi.org/10.1117/12.461549

KEYWORDS: Mirrors, Interfaces, Finite element methods, Temperature metrology, Cryogenics, Space telescopes, Sensors, Kinematics, Phase modulation, Space operations

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The Lockheed Martin/Advanced Technology Center (LM/ATC) developed a lightweight, compact, high-load capable and yet high precision latch for use on deployable optical systems such as the Next Generation Space Telescope (NGST). The design allows precise self-centering and control of the stiffness at the latch interface. It also incorporates unique capabilities to evaluate the effects of gravity loads, latch preload level, creep, and very low vibration loads on the dynamics and microdynamics of the deployed instrument. The stiffness, nonlinearity and hysteresis characteristics of the latch and its catch flexure assembly were thoroughly tested in 6 axes down to the nanometer level at room temperature using the LM/ATC Compliance Measurement Device. The latch is stiff enough to hold an NGST-size mirror segment cantilevered against gravity allowing only small gravity sag when the primary mirror is horizontal, thus enabling end-to-end performance verification in 1-G in that orientation. The latch hysteresis is less than 1.0 nm/N under mechanical loads less than 25 N, which meets the NGST stability requirements with significant margin (20 nm at the tip of the petal in space environment). Several of these latches were integrated and demonstrated at the petal assembly level on a Single Petal Test-bed and the experimental results obtained on that test-bed are consistent with the component level results described in this report. We experimentally demonstrated that the latch engagement performance is not affected by exposure to cryogenic temperatures down to 20K, as required for use of the device on cryogenic infrared optical instruments such as NGST. A structural model of the latch was developed using Finite Element Analysis. Good correlation was obtained between the linear components of the analytical and of the experimental results: the model can therefore reliably be used in future NGST or other mission design efforts. This paper includes a brief description of the LM/ATC latch hardware and its principle of operation as well as the results of the modeling and the experimental characterization work performed on that hardware in the NGST Phase I formulation.

Proceedings Article | 5 March 2003 Paper

Development and microdynamics characterization of a deployable petal assembly at full scale

Alain Carrier, Jean-Noel Aubrun, Robert Clappier, Timothy Hilby, Kenneth Lorell, Bruce Romney, Larry Sokolsky, Jim Uphoff

Proceedings Volume 4850, (2003) https://doi.org/10.1117/12.461556

KEYWORDS: Mirrors, Mirror structures, Position sensors, Interfaces, Cryogenics, Optical fabrication, Space telescopes, Actuators, Telescopes, Sensors

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Proceedings Article | 30 January 2003 Paper

Design and preliminary test of a precision segment positioning actuator for the California Extremely Large Telescope primary mirror

Kenneth Lorell, Jean-Noel Aubrun, Robert Clappier, Ben Shelef, Gad Shelef

Proceedings Volume 4840, (2003) https://doi.org/10.1117/12.459974

KEYWORDS: Actuators, Mirrors, Control systems, Telescopes, Control systems design, Position sensors, Space telescopes, Sensors, Optical instrument design, Prototyping

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Proceedings Article | 25 November 2002 Paper

Cryogenic tunable near-infrared Fabry Perot interferometer for Next Generation Space Telescope

Charles Yee, Lawrence Lesyna, Kenneth Lorell, Jean-Noel Aubrun, Pat Champagne, Neal Didriksen, Victor Nikolaskin, Roger Mihara, Robert Clappier, Ramji Digumarthi

Proceedings Volume 4822, (2002) https://doi.org/10.1117/12.452332

KEYWORDS: Sensors, Mirrors, Capacitance, Coating, Cryogenics, Temperature metrology, Fabry–Perot interferometry, Calibration, Actuators, Capacitors

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Proceedings Article | 25 August 1998 Paper

Test and performance evaluation of the Gemini secondary mirror chopper and position control system

Kenneth Lorell, Jean-Noel Aubrun, Ernesto Perez, Paul Reshatoff, Donald Zacharie

Proceedings Volume 3352, (1998) https://doi.org/10.1117/12.319279

KEYWORDS: Mirrors, Control systems, Interferometers, Gemini Observatory, Hardware testing, Sensors, Amplifiers, Photography, Calibration, Telescopes

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Proceedings Article | 25 August 1998 Paper

Design of the infrared fast steering mirror chopping control system for the Keck II Telescope

Jean-Noel Aubrun, Kenneth Lorell, Gregory Feher, Ernesto Perez, Paul Reshatoff, Donald Zacharie

Proceedings Volume 3352, (1998) https://doi.org/10.1117/12.319278

KEYWORDS: Mirrors, Actuators, Telescopes, Control systems, Control systems design, Infrared telescopes, Sensors, Infrared radiation, Calibration, Motion measurement

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Proceedings Article | 31 May 1994 Paper

Experiments in modeling and control of the ASCIE segmented reflector

Alain Carrier, Jean-Noel Aubrun

Proceedings Volume 2201, (1994) https://doi.org/10.1117/12.176123

KEYWORDS: Control systems, Reflectors, Data modeling, Systems modeling, Mirrors, Actuators, Astronomy, Adaptive optics, Sensors, Performance modeling

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Proceedings Article | 31 May 1994 Paper

Design and operation of the infrared chopping secondary mirror for the Keck 10-m telescope

Kenneth Lorell, Jean-Noel Aubrun, Gregory Feher, Ernesto Perez, Donald Zacharie, Paul Reshatoff

Proceedings Volume 2201, (1994) https://doi.org/10.1117/12.176117

KEYWORDS: Mirrors, Telescopes, Actuators, Infrared telescopes, Astronomy, Control systems, Adaptive optics, Control systems design, Infrared radiation, Electromechanical design

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Proceedings Article | 21 January 1993 Paper

High-performance chopping secondary mirror for infrared astronomy

Kenneth Lorell, Jean-Noel Aubrun, Gregory Feher, Ernesto Perez, Donald Zacharie, Paul Reshatoff

Proceedings Volume 1765, (1993) https://doi.org/10.1117/12.140884

KEYWORDS: Mirrors, Actuators, Telescopes, Control systems, Control systems design, Optical cryogenics, Motion measurement, Calibration, Electromechanical design, Electronics

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Proceedings Article | 21 January 1993 Paper

Direct-drive digitally commutated filter wheel positioning system for cryogenic optical applications

Kenneth Lorell, Jean-Noel Aubrun, Walter Opyd, Allen Wood

Proceedings Volume 1765, (1993) https://doi.org/10.1117/12.140883

KEYWORDS: Optical filters, Servomechanisms, Space telescopes, Telescopes, Control systems, Switches, Optical cryogenics, Cryogenics, Optical amplifiers, Switching

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Proceedings Article | 10 July 1992 Paper

Modal characterization of the ASCIE segmented optics test bed: new algorithms and experimental results

Alain Carrier, Jean-Noel Aubrun

Proceedings Volume 1696, (1992) https://doi.org/10.1117/12.138149

KEYWORDS: Actuators, Sensors, Optimization (mathematics), Control systems, Algorithm development, Systems modeling, Matrices, Space telescopes, Complex systems, Optical testing

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Showing 5 of 12 publications

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