Dr. Craig L. Hom Profile

Dr. Craig L. Hom

Scientist at Lockheed Martin Space Systems Co

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Author

Publications (16)

Proceedings Article | 18 September 2013 Paper

Design of bipod flexure mounts for the IRIS spectrometer

Isaac Weingrod, Catherine Chou, Buck Holmes, Craig Hom, James Wes Irwin, Obert Lindstrom, Frank Lopez, David Stubbs, Jean-Pierre Wüelser

Proceedings Volume 8836, 88360Q (2013) https://doi.org/10.1117/12.2024478

KEYWORDS: Mirrors, IRIS Consortium, Interfaces, Adhesives, Collimators, Spectrographs, Ultraviolet radiation, Epoxies, Temperature metrology, Glasses

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Proceedings Article | 18 September 2013 Paper

Implementing stray light baffles for improved JWST NIRCam performance

Paul Mammini, Tom Birge, Paul Dineen, Craig Hom, Michael Jacoby, Alison Nordt, Rob Shivitz

Proceedings Volume 8836, 88360T (2013) https://doi.org/10.1117/12.2024374

KEYWORDS: Stray light, Staring arrays, James Webb Space Telescope, Optical fabrication, Epoxies, Mirrors, Neodymium, Computer aided design, Cameras, Cryogenics

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Proceedings Article | 24 September 2011 Paper

Adhesive bond cryogenic lens cell margin of safety test

David Stubbs, Craig Hom, Howard Holmes, Joseph Cannon-Morret, Obert Lindstrom, J. Wes Irwin, Leigh Ryder, Troy Hix, Jane Bonvallet, Hsin-Kuei Hu, Ira Chapman, Curtis Lomax, E. Todd Kvamme, Gregory Feller, Mark Haynes

Proceedings Volume 8125, 81250N (2011) https://doi.org/10.1117/12.891872

KEYWORDS: Adhesives, Molybdenum, Cryogenics, Safety, Lens design, Failure analysis, Finite element methods, Optics manufacturing, Scanning electron microscopy, Chromium

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Proceedings Article | 18 September 2009 Paper

NIRCam filter wheel optic mount design

Béla Privári, Craig Hom, Michael Jacoby

Proceedings Volume 7439, 74391E (2009) https://doi.org/10.1117/12.826533

KEYWORDS: Optical filters, Silica, Silicon, Ear, Thermography, Interfaces, Optical design, James Webb Space Telescope, Image filtering, Tolerancing

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Proceedings Article | 18 September 2009 Paper

Cryogenic bonding for lens mounts

Craig Hom, Howard Holmes, Dennis Lapicz, Ira Chapman, E. Todd Kvamme, David Stubbs

Proceedings Volume 7439, 743910 (2009) https://doi.org/10.1117/12.826494

KEYWORDS: Laser induced fluorescence, Adhesives, Cryogenics, Aluminum, Finite element methods, Glasses, Thermography, Molybdenum, Lens design, Distortion

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Proceedings Article | 18 September 2009 Paper

Athermalized embedding of actuators in cryogenic mirrors

Craig Hom, Gopal Vasudevan, Mark Sullivan, B. Martin Levine

Proceedings Volume 7439, 743911 (2009) https://doi.org/10.1117/12.826650

KEYWORDS: Actuators, Mirrors, Cryogenics, Ferroelectric materials, Silicon carbide, Distortion, Tungsten, Manufacturing, Temperature metrology, Deformable mirrors

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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 | 22 June 2000 Paper

Modeling electrostrictive deformable mirrors in adaptive optics systems

Craig Hom, Peter Dean, Stephen Winzer

Proceedings Volume 3985, (2000) https://doi.org/10.1117/12.388842

KEYWORDS: Actuators, Mirrors, Deformable mirrors, Systems modeling, Adaptive optics, Polarization, Wavefronts, Distortion, Thermal blooming, Multilayers

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Proceedings Article | 14 June 2000 Paper

Temperature-dependent hysteresis model for relaxor ferroelectrics

Ralph Smith, Craig Hom

Proceedings Volume 3992, (2000) https://doi.org/10.1117/12.388210

KEYWORDS: Polarization, Magnesium, Data modeling, Temperature metrology, Dielectric polarization, Thermodynamics, Ferroelectric materials, Motion models, Niobium, Dielectrics

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Proceedings Article | 4 June 1999 Paper

Domain wall model for ferroelectric hysteresis

Ralph Smith, Craig Hom

Proceedings Volume 3667, (1999) https://doi.org/10.1117/12.350070

KEYWORDS: Polarization, Data modeling, Ferroelectric materials, Dielectric polarization, Mathematical modeling, Actuators, Motion models, Dielectrics, Information operations, Ferromagnetics

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Proceedings Article | 4 June 1999 Paper

Constitutive model for relaxor ferroelectrics

Craig Hom, Natarajan Shankar

Proceedings Volume 3667, (1999) https://doi.org/10.1117/12.350068

KEYWORDS: Dielectric polarization, Magnesium, Dielectrics, Data modeling, Temperature metrology, Thermodynamics, Ions, Niobium, Lead, Ferroelectric materials

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Proceedings Article | 27 July 1998 Paper

Analysis of mechanical systems driven by electrostrictive actuators

Craig Hom, Natarajan Shankar

Proceedings Volume 3329, (1998) https://doi.org/10.1117/12.316926

KEYWORDS: Actuators, Distortion, Ceramics, Transducers, Curium, Acoustics, Systems modeling, Complex systems, Finite element methods, Polarization

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Proceedings Article | 24 July 1998 Paper

Modeling time-dependent behavior in relaxor ferroelectrics

Craig Hom, Natarajan Shankar

Proceedings Volume 3323, (1998) https://doi.org/10.1117/12.316310

KEYWORDS: Polarization, Switching, Data modeling, Temperature metrology, Actuators, Ceramics, Dielectric polarization, Solids, Mathematical modeling, Picosecond phenomena

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Proceedings Article | 6 June 1997 Paper

Modeling the dynamic behavior of electrostrictive actuators

Craig Hom, Natarajan Shankar

Proceedings Volume 3041, (1997) https://doi.org/10.1117/12.275652

KEYWORDS: Actuators, Distortion, Polarization, Dielectric polarization, Dielectrics, Chlorine, Missiles, Electrodes, Electrostriction, Americium

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Proceedings Article | 31 May 1996 Paper

Constitutive and failure models for relaxor ferroelectric ceramics

Craig Hom, Steven Brown, Natarajan Shankar

Proceedings Volume 2715, (1996) https://doi.org/10.1117/12.240810

KEYWORDS: Dielectric polarization, Actuators, Ceramics, Dielectrics, Polarization, Data modeling, Finite element methods, Solids, Multilayers, Calcium

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Proceedings Article | 5 May 1995 Paper

Finite element modeling of multilayered electrostrictive actuators

Craig Hom, Natarajan Shankar

Proceedings Volume 2442, (1995) https://doi.org/10.1117/12.208857

KEYWORDS: Actuators, Electrodes, Multilayers, Composites, Ceramics, Finite element methods, Epoxies, Dielectric polarization, Polarization, Aluminum

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Showing 5 of 16 publications

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