Mr. James H. Clark Profile

James H. Clark

Engineer at US Naval Research Lab

SPIE Involvement:

Conference Program Committee | Author

Area of Expertise:

optomechanics , Leadership/management , Solids mechanics , systems engineering

Profile Summary

James H Clark III, Director of the Navy Precision Optical Interferometer (NPOI) in Flagstaff, Arizona as of August 2018, received his master’s degree in mechanical engineering from Northern Arizona University (NAU) in 2006 and is currently a PhD candidate in the same department. Prior to joining NPOI, he worked at Optelecom, Inc. on fiber optic payout systems for guided missiles, tethered terrestrial and unmanned underwater vehicles. His research interests include solid mechanics and optomechanical systems. Some of his past research projects included analysis of optical fiber strain in wound composite payout bobbins under dynamic and thermal loading, deflection and compliance sensitivities of mounted optical mirrors under thermal and gravity loading, and modal analysis of large aperture fast steering mirror structures. Since 2005, he has worked closely with NAU on a variety of applications related to the NPOI, and intermittently teaches classes as a part-time instructor in mechanical engineering and sponsors senior engineering capstone projects. He has disseminated the results of his research activities in archival journals as well as technical conferences.

Publications (44)

Proceedings Article | 26 August 2022 Presentation + Paper

Presentation + Paper

The Navy Precision Optical Interferometer: large-aperture observations and infrastructure improvements

Gerard van Belle, James Clark, Henrique Schmitt, David Noble, Anders Jorgensen, David Mozurkewich, J. Thomas Armstrong, Ellyn Baines, Merrick DeWitt, Ty Martinez, Sergio Restaino, Jordan Stone, Thomas Coleman, Ben Hardesty, Wyatt Clark, Khristian Jones, Bradley Kingsley, Erin Maier, Solvay Blomquist, Nicholas Green, Peter Kurtz

Proceedings Volume 12183, 1218304 (2022) https://doi.org/10.1117/12.2630572

KEYWORDS: Telescopes, Interferometers, Observatories, Adaptive optics, Mirrors, Precision optics, Interferometry, Control systems, Stars

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Proceedings Article | 26 August 2022 Presentation + Paper

Presentation + Paper

Automation upgrades at the navy precision optical interferometer

Anders Jorgensen, Khristian Jones, David Noble, James Clark, Henrique Schmitt, Gerard van Belle

Proceedings Volume 12183, 121830O (2022) https://doi.org/10.1117/12.2630129

KEYWORDS: Switches, Control systems, Safety, Precision optics, Interferometers, Analog electronics, Computer programming, Stepper motor drivers, Logic, Power supplies

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Proceedings Article | 13 December 2020 Presentation + Paper

Presentation + Paper

The Navy Precision Optical Interferometer: two years of development towards large-aperture observations

Gerard van Belle, James Clark, J. Thomas Armstrong, Ellyn Baines, Ty Martinez, Sergio Restaino, Henrique Schmitt, Anders Jorgensen, David Mozurkewich, Teznie Pugh, Wyatt Clark, Nicholas Green, Khristian Jones, Bradley Kingsley, Peter Kurtz, Adam Schilperoort

Proceedings Volume 11446, 1144608 (2020) https://doi.org/10.1117/12.2562806

KEYWORDS: Precision optics, Interferometers, Telescopes, Imaging systems, Electron multiplying charge coupled devices, Cameras, Image processing, Interferometry, Image restoration, Adaptive optics

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Proceedings Article | 20 August 2020 Presentation + Paper

Presentation + Paper

A multi-synchronous architecture to control an array of networked siderostats or telescopes at the Navy Precision Optical Interferometer

Adam Schilperoort, Peter Kurtz, James Clark, Henrique Schmitt

Proceedings Volume 11502, 115020C (2020) https://doi.org/10.1117/12.2568147

KEYWORDS: Mirrors, Human-machine interfaces, Control systems, Actuators, Switches, Computer architecture, Telescopes, Stars, Interferometers, Feedback loops

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Proceedings Article | 20 August 2020 Presentation + Paper

Presentation + Paper

An approach to upgrading the beam transport system at the Navy Precision Optical Interferometer

James Clark, F. Ernesto Penado, Sergio Restaino, Henrique Schmitt

Proceedings Volume 11488, 1148804 (2020) https://doi.org/10.1117/12.2567933

KEYWORDS: Mirrors, Wavefronts, Telescopes, Interferometers, Relays, Precision optics, Imaging systems, Light emitting diodes

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Proceedings Article | 30 August 2019 Presentation + Paper

Presentation + Paper

Optomechanical design considerations for a vacuum window for optical and infrared interferometry

F. Ernesto Penado, James Clark

Proceedings Volume 11100, 1110002 (2019) https://doi.org/10.1117/12.2528204

KEYWORDS: Glasses, Metals, Infrared radiation, Interferometers, Interferometry, Finite element methods, Optomechanical design, Failure analysis

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Proceedings Article | 19 September 2018 Presentation + Paper

Presentation + Paper

Experimental verification of compliant mirror wavefront correction using a single actuator

James Clark III, F. Ernesto Penado, Micha Heilman, Wyatt Clark

Proceedings Volume 10747, 1074708 (2018) https://doi.org/10.1117/12.2320701

KEYWORDS: Mirrors, Wavefronts, Actuators, Interferometers, Deformable mirrors, Observatories, Finite element methods, Relays, Phase shifts, Precision optics, Long baseline optical interferometry

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Proceedings Article | 9 July 2018 Presentation + Paper

Presentation + Paper

Many interesting things are afoot at the Navy Precision Optical Interferometer

G. van Belle, J. Armstrong, J. Benson, E. Baines, R. Bevilacqua, T. Buschmann, J. Clark, W. DeGroff, J. Hall, R. Hindsley, A. Jorgensen, A. Lindgren, D. Mozurkewich, M. Muterspaugh, S. Pooler, S. Restaino, H. Schmitt, P. Shankland, R. Zavala

Proceedings Volume 10701, 1070105 (2018) https://doi.org/10.1117/12.2314204

KEYWORDS: Telescopes, Interferometers, Mirrors, Electron multiplying charge coupled devices, Observatories, Avalanche photodetectors, Precision optics, Interferometry, Beam splitters

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Proceedings Article | 19 August 2016 Paper

Paper

The Navy Precision Optical Interferometer: an update

J. Armstrong, Ellyn Baines, Henrique Schmitt, Sergio Restaino, James Clark, James Benson, Donald Hutter, Robert Zavala, Gerard van Belle

Proceedings Volume 9907, 990702 (2016) https://doi.org/10.1117/12.2235077

KEYWORDS: Precision optics, Interferometers, Stars, Control systems, Telescopes, Observatories, Mirrors, Electronics, Interferometry, Cameras

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Proceedings Article | 17 May 2016 Paper

Paper

Using optical interferometry for GEO satellites imaging: an update

Sergio Restaino, J. Thomas Armstrong, Ellyn Baines, Henrique Schmitt, James Clark

Proceedings Volume 9836, 983603 (2016) https://doi.org/10.1117/12.2224750

KEYWORDS: Satellites, Interferometers, Spectrographs, Optical interferometry, Satellite imaging, Space telescopes, Modulation, Stars, Telescopes, Sun

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SPIE Journal Paper | 28 April 2016

Compliant deformable mirror approach for wavefront improvement

James Clark, F. Ernesto Penado

OE, Vol. 55, Issue 04, 043107, (April 2016) https://doi.org/10.1117/12.10.1117/1.OE.55.4.043107

KEYWORDS: Mirrors, Wavefronts, Deformable mirrors, Actuators, Relays, Interferometers, Adaptive optics, Finite element methods, Calibration, Wavefront distortions

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Proceedings Article | 4 September 2015 Paper

Paper

Multiple-baseline detection of a geostationary satellite with the Navy Precision Optical Interferometer

J. Armstrong, Ellyn Baines, Henrique Schmitt, Sergio Restaino, James Clark, James Benson, Donald Hutter, Robert Zavala

Proceedings Volume 9617, 961709 (2015) https://doi.org/10.1117/12.2194156

KEYWORDS: Satellites, Interferometers, Satellite navigation systems, Precision optics, Spectrographs, Stars, Space telescopes, Modulation, Observatories, Sun

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Proceedings Article | 2 September 2015 Paper

Paper

Elliptically framed tip-tilt mirror optimized for stellar tracking

James Clark, F. Penado, Jeremy Petak

Proceedings Volume 9573, 95730B (2015) https://doi.org/10.1117/12.2187559

KEYWORDS: Mirrors, Aluminum, Computer aided design, Actuators, Optical tracking, Telescopes, Solid modeling, Space telescopes, Glasses, Precision optics

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Proceedings Article | 8 September 2014 Paper

Paper

Analysis methodology for a piezoelectric-driven optical tracker for ground-based interferometry

James Clark, F. Ernesto Penado

Proceedings Volume 9195, 91950A (2014) https://doi.org/10.1117/12.2062490

KEYWORDS: Actuators, Mirrors, Optical tracking, Telescopes, Ferroelectric materials, Relays, Interferometers, Ocean optics, Interferometry, Analytical research

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Proceedings Article | 18 August 2014 Paper

Paper

Adding baselines at the Navy Precision Optical Interferometer

Jonathan Andrews, Jim Clark, Sergio Restaino, J. Tom Armstrong, Henrique Schmitt, Ellyn Baines, Donald Hutter, James Benson, Bob Zavala

Proceedings Volume 9204, 92040H (2014) https://doi.org/10.1117/12.2062616

KEYWORDS: Interferometers, Mirrors, Precision optics, Astronomy, Telescopes, Astronomical imaging, Astronomical telescopes, Optical alignment, Observatories, Cameras

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Proceedings Article | 24 July 2014 Paper

Paper

Progress toward unprecedented imaging of stellar surfaces with the Navy precision optical interferometer

A. Jorgensen, D. Mozurkewich, H. Schmitt, G. van Belle, D. Hutter, J. Clark, J. Armstrong, E. Baines, K. Newman, M. Landavazo, B. Sun, S. Restaino

Proceedings Volume 9146, 91460A (2014) https://doi.org/10.1117/12.2055789

KEYWORDS: Visibility, Stars, Telescopes, Interferometers, Data acquisition, Image resolution, Signal to noise ratio, Spectrographs, Precision optics, Imaging arrays

Read Abstract +

We present progress on the stellar surface imaging project recently funded by the U. S. National Science Foun- dation. With the unique layout of the Navy Precision Optical Interferometer (NPOI) in combination with data acquisition and fringe-tracking upgrades we expect to be able to substantially exceed the imaging fidelity and resolution of any other interferometer in operation. The project combines several existing advances and infras- tructure at NPOI with modest enhancements. For optimal imaging there are several requirements that should be fulfilled. The observatory should be capable of measuring visibilities on a wide range of baseline lengths and orientations, providing complete Fourier (UV) coverage in a short period of time. It should measure visibility amplitudes with good SNR on all baselines as critical imaging information is often contained in low-amplitude visibilities. It should measure the visibility phase on all baselines. The technologies which can achieve this are the NPOI Y-shaped array with (nearly) equal spacing between telescopes and an ability for rapid configuration. Placing 6-telescopes in a row makes it possible to measure visibilities into the 4th lobe of the visibility function. By arranging the 12 available telescopes carefully we can switch, every few days, between 6 different 6-station chains which provide symmetric coverage in the Fourier plane without moving any telescopes, only by moving beam relay mirrors. The 6-station chains are important to achieve the highest imaging resolution, and switching rapidly between station chains provides uniform coverage. Coherent integration techniques can be used to obtain good SNR on very small visibilities. Coherently integrated visibilities can be used for imaging with standard radio imaging packages such as AIPS. The commissioning of one additional station, the use of new data acqui- sition hardware and fringe tracking algorithms are the enhancements which are making this project a reality. The New Classic data acquisition system, based on a powerful Stratix FPGA and fast Direct Memory Access module, upgrades the existing Classic beam combiner to allow for continuous data recording across all baselines available with 6 telescopes. It also provides the computing power and software environment necessary for im- plementing the 6-station, 5-baseline fringe-tracking algorithms. In separate papers we discuss the New Classic data acquisition system and the fringe-tracking algorithms in greater detail. In this paper we will focus on an overview of the project. We will describe the observation planning, logistics of the observations, and discuss the current status of the project including preliminary results and simulations of expected future results.

SPIE Journal Paper | 9 January 2014 Open Access

Open Access

Method of analysis for determining and correcting mirror deformation due to gravity

James Clark, F. Ernesto Penado

OE, Vol. 53, Issue 01, 015102, (January 2014) https://doi.org/10.1117/12.10.1117/1.OE.53.1.015102

KEYWORDS: Mirrors, Off axis mirrors, Adaptive optics, Finite element methods, Interferometers, Wavefronts, Analytical research, Optical engineering, Chemical elements, Precision optics

Read Abstract +

Proceedings Article | 15 October 2012 Paper

Paper

A support structure for a compliant deformable mirror

F. Ernesto Penado, James Clark, Joel Dugdale

Proceedings Volume 8491, 84910D (2012) https://doi.org/10.1117/12.930008

KEYWORDS: Mirrors, Wavefronts, Actuators, Relays, Deformable mirrors, Reflectivity, Finite element methods, Adaptive optics, Interferometers, Reflection

Read Abstract +

Proceedings Article | 24 September 2011 Paper

Paper

Deformation analysis of tilted primary mirror for an off-axis beam compressor

James Clark, F. Ernesto Penado, Joel Dugdale

Proceedings Volume 8125, 81250C (2011) https://doi.org/10.1117/12.894167

KEYWORDS: Mirrors, Off axis mirrors, Wavefronts, Relays, Interferometers, Finite element methods, Adaptive optics, Observatories, Prototyping, Wavefront aberrations

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Proceedings Article | 10 September 2011 Paper

Paper

Analysis of a compliant static deformable mirror for wavefront error cancellation

F. Ernesto Penado, James Clark, Joel Dugdale

Proceedings Volume 8127, 81270C (2011) https://doi.org/10.1117/12.894168

KEYWORDS: Mirrors, Wavefronts, Relays, Adaptive optics, Actuators, Wavefront distortions, Interferometers, Deformable mirrors, Error analysis, Finite element methods

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Proceedings Article | 3 September 2010 Paper

Paper

Stiffening an off-axis beam compressor mount for improved performance

F. Ernesto Penado, James Clark, Frank Cornelius

Proceedings Volume 7793, 77930G (2010) https://doi.org/10.1117/12.860270

KEYWORDS: Mirrors, Prototyping, Aluminum, Interferometers, Finite element methods, Observatories, Mirror mounts, Relays, Analytical research, Visible radiation

Read Abstract +

The Navy Prototype Optical Interferometer (NPOI) near Flagstaff, Arizona, makes use of separate smaller optical elements spaced along a Y-array and used simultaneously to simulate an equivalent single large telescope. The instrument is useful in generating and upgrading existing astronomical catalogues and investigating synthetic aperture optical imaging techniques. The NPOI is a joint collaboration between the US Naval Observatory and Naval Research Laboratory in collaboration with the Lowell Observatory. Stellar radiation (visible light) reflects off 35 cm diameter flat mirrors, also known as siderostats, toward a tilt-tip mirror, which reflects a 12 cm diameter beam through a multi-reflection relay transport system. To maximize the reflective area of the siderostat optics and achieve an increase by a factor of 8.5 in light collecting area, a beam compressor is to be installed between the siderostat and fast tip/tilt mirror. However, the present configuration of a prototype beam compressor mount (BCM) vibrates at unacceptable amplitudes, which makes it nearly impossible to optically align the mirrors. This paper presents the results of finite element analyses conducted to quantify the design limitations of the prototype beam compressor mount. The analyses indicated that the current configuration is too soft, with very low fundamental frequencies, which verified the difficulties encountered during alignment tests. Based on these results, design modifications have been proposed to increase the overall structural stiffness of the mount and increase its fundamental frequency of vibration. These modifications will mechanically stabilize the structure for the alignment of the optics, and allow integration of the compressor into the interferometer. The interferometer will then have the capability to capture more light from each siderostat and allow observations of fainter stellar targets. More generally, the results can be useful as a guide for engineers and scientists involved in the design of similar optomechanical structures.

Proceedings Article | 22 July 2010 Paper

Paper

Wavefront calibration and correction of an optical train path: a compliant static deformable mirror approach

James Clark, F. Ernesto Penado, Frank Cornelius

Proceedings Volume 7734, 773429 (2010) https://doi.org/10.1117/12.856970

KEYWORDS: Mirrors, Wavefronts, Relays, Adaptive optics, Photovoltaics, Interferometers, Calibration, Wavefront distortions, Deformable mirrors, Actuators

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Proceedings Article | 10 September 2009 Paper

Paper

Optimizing the frequency response of a steering mirror mount for interferometry applications

F. Ernesto Penado, James Clark

Proceedings Volume 7424, 742403 (2009) https://doi.org/10.1117/12.825338

KEYWORDS: Mirrors, Composites, Mirror mounts, Foam, Glasses, Aluminum, Solids, Interferometers, Finite element methods, Interferometry

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Proceedings Article | 10 September 2009 Paper

Paper

Mirror deformation versus contact area in mounted flat mirrors

James Clark, F. Ernesto Penado, Frank Cornelius

Proceedings Volume 7424, 74240C (2009) https://doi.org/10.1117/12.826747

KEYWORDS: Mirrors, Interferometers, Finite element methods, Phase shifts, Reflectivity, Tolerancing, Prototyping, Coating, Calibration, Observatories

Read Abstract +

Proceedings Article | 28 July 2008 Paper

Paper

NPOI: recent progress and future prospects

Donald Hutter, James Benson, Tim Buschmann, Michael DiVittorio, Robert Zavala, Kenneth Johnston, J. Thomas Armstrong, Robert Hindsley, Henrique Schmitt, James Clark, Sergio Restaino, Christopher Tycner, Anders Jorgensen, Sam Davis

Proceedings Volume 7013, 701306 (2008) https://doi.org/10.1117/12.787486

KEYWORDS: Stars, Interferometry, Control systems, Visibility, Telescopes, Observatories, Mirrors, Interferometers, Calibration, Coating

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Proceedings Article | 28 July 2008 Paper

Paper

Mount-induced deflections in 8-inch flat mirrors at the Navy Prototype Optical Interferometer

James Clark, F. Ernesto Penado, Michael DiVitorrio, Joshua Walton

Proceedings Volume 7013, 70133K (2008) https://doi.org/10.1117/12.790257

KEYWORDS: Mirrors, Finite element methods, Interferometers, Prototyping, Phase shifts, Tolerancing, Zerodur, Optics manufacturing, Coating, Off axis mirrors

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Proceedings Article | 17 September 2007 Paper

Paper

Calculation of the elastic properties of a triangular cell core for lightweight composite mirrors

F. Ernesto Penado, James Clark, Joshua Walton, Robert Romeo, Robert Martin

Proceedings Volume 6665, 66650B (2007) https://doi.org/10.1117/12.732689

KEYWORDS: Composites, Mirrors, Finite element methods, Lightweight mirrors, Aluminum, Telescopes, Carbon, Interfaces, 3D modeling, Optical telescopes

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Proceedings Article | 17 September 2007 Paper

Paper

Design of asymmetrically loaded end-plates with vacuum seal surfaces for the Navy Prototype Optical Interferometer

Joshua Walton, James Clark, F. Ernesto Penado

Proceedings Volume 6665, 666513 (2007) https://doi.org/10.1117/12.733962

KEYWORDS: Finite element methods, Computer aided design, Safety, Tolerancing, Prototyping, Manufacturing, Interferometers, Solid modeling, Observatories, Surface finishing

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Proceedings Article | 17 September 2007 Paper

Paper

Optical mount modifications for increased articulation at the Navy Prototype Optical Interferometer

James Clark, Joshua Walton, F. Ernesto Penado, Denver Smith

Proceedings Volume 6665, 666512 (2007) https://doi.org/10.1117/12.734171

KEYWORDS: Mirrors, Actuators, Prototyping, Interferometers, Telescopes, Optical alignment, Mirror mounts, Optical mounts, Light emitting diodes, Metrology

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Proceedings Article | 17 September 2007 Paper

Paper

Pier vibration isolation for lightweight interferometry telescopes

Perry Wood, F. Ernesto Penado, James Clark, Joshua Walton

Proceedings Volume 6665, 66650L (2007) https://doi.org/10.1117/12.732730

KEYWORDS: Telescopes, Space telescopes, Optical isolators, Interferometers, Buildings, Vibration isolation, Interferometry, Prototyping, Wave propagation, Image quality

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Proceedings Article | 17 September 2007 Paper

Paper

Current alignment techniques and tools for building, aligning, and reconfiguring an optical array at the Navy Prototype Optical Interferometer

James Clark, Joshua Walton

Proceedings Volume 6665, 666511 (2007) https://doi.org/10.1117/12.734248

KEYWORDS: Mirrors, Light emitting diodes, Telescopes, Optical alignment, Tolerancing, Vignetting, Prototyping, Interferometers, Eye, Optical arrays

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Proceedings Article | 17 September 2007 Paper

Paper

Design and analysis of a rotationally resistant floor for a telescope enclosure

Perry Wood, F. Ernesto Penado, James Clark, Joshua Walton

Proceedings Volume 6665, 66650J (2007) https://doi.org/10.1117/12.732725

KEYWORDS: Telescopes, Finite element methods, Optical instrument design, Fourier transforms, Solids, Analytical research, Interferometry, Interferometers, Optical interferometry, Soil science

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Proceedings Article | 29 August 2006 Paper

Paper

The 1.4 meter lightweight carbon fiber mount for the Naval Prototype Optical Interferometer

Jonathan Andrews, Sergio Restaino, Christopher Wilcox, Scott Teare, Ty Martinez, Jim Clark, Josh Walton, Robert Romeo, Robert Martin

Proceedings Volume 6306, 63060R (2006) https://doi.org/10.1117/12.682102

KEYWORDS: Telescopes, Adaptive optics, Interferometers, Prototyping, Carbon, Mirrors, Optical instrument design, Electronics, Composites, Optics manufacturing

Read Abstract +

Proceedings Article | 29 June 2006 Paper

Paper

Early type stars as calibrators for ground-based interferometry

Jinmi Yoon, Deane Peterson, Thomas Armstrong, James Clark III, Charmaine Gilbreath, Thomas Pauls, Henrique Schmitt

Proceedings Volume 6268, 626848 (2006) https://doi.org/10.1117/12.670309

KEYWORDS: Stars, Visibility, Calibration, Interferometry, Error analysis, Observatories, Michelson interferometers, Prototyping, Interferometers, Atmospheric modeling

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Proceedings Article | 29 June 2006 Paper

Paper

Characterization of the optical throughput performance of the Navy Prototype Optical Interferometer (NPOI)

Xiaolei Zhang, J. Thomas Armstrong, James Clark, G. Charmaine Gilbreath, Robert Lucke, Sergio Restaino, David Mozurkewich, James Benson, Donald Hutter, Nat White, Henrique Schmitt, Joshua Walton

Proceedings Volume 6268, 62683V (2006) https://doi.org/10.1117/12.670001

KEYWORDS: Mirrors, Spectroscopy, Interferometers, Ocean optics, Beam splitters, Geometrical optics, Sensors, Charge-coupled devices, Prototyping, CCD cameras

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Proceedings Article | 28 June 2006 Paper

Paper

Using differential phases in optical interferometry

Henrique Schmitt, Thomas Pauls, Christopher Tycner, J. Thomas Armstrong, James Benson, James Clark, Robert Hindsley, Donald Hutter, Deane Peterson, Anders Jorgensen, David Mozurkewich, G. Charmaine Gilbreath, Robert Zavala

Proceedings Volume 6268, 62683B (2006) https://doi.org/10.1117/12.672396

KEYWORDS: Stars, Calibration, Phase interferometry, Optical interferometry, Observatories, Beryllium, Interferometers, Analytical research, Prototyping, Phase measurement

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Proceedings Article | 27 June 2006 Paper

Paper

Toward complex visibilities using optical interferometry: multiwavelength phase referencing

Thomas Pauls, Henrique Schmitt, Christopher Tycner, J. Thomas Armstrong, James Benson, James Clark, G. Charmaine Gilbreath, Robert Hindsley, Donald Hutter, Anders Jorgensen

Proceedings Volume 6268, 62680W (2006) https://doi.org/10.1117/12.671881

KEYWORDS: Stars, Visibility, Beryllium, Calibration, Optical interferometry, Interferometers, Phase interferometry, Observatories, Interferometry, Prototyping

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Proceedings Article | 20 October 2004 Paper

Paper

Optical drift test of the long delay line stations on the Navy Prototype Optical Interferometer

James Clark, James Murphy, Long Ha, Joshua Walton, James Howard, J. Armstrong, G. Gilbreath, Robert Hindsley, Thomas Pauls

Proceedings Volume 5491, (2004) https://doi.org/10.1117/12.550889

KEYWORDS: Mirrors, Telescopes, Ocean optics, Light emitting diodes, Prototyping, Interferometers, Optical testing, Cameras, Optical tracking, Mirror mounts

Read Abstract +

Proceedings Article | 20 October 2004 Paper

Paper

H-alpha observations using closure phases at the NPOI

G. Gilbreath, Thomas Pauls, J. Armstrong, David Mozurkewich, James Clark, Robert Hindsley, Donald Hutter

Proceedings Volume 5491, (2004) https://doi.org/10.1117/12.555221

KEYWORDS: Stars, Beryllium, Calibration, Platinum, Ultraviolet radiation, Phase measurement, Interferometers, Optical filters, Visibility, Prototyping

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Proceedings Article | 20 October 2004 Paper

Paper

Alignment of vacuum feed stations on the Navy Prototype Optical Interferometer

James Clark, James Murphy, Long Ha, Joshua Walton, James Howard, J. Armstrong, G. Gilbreath, Robert Hindsley, Thomas Pauls

Proceedings Volume 5491, (2004) https://doi.org/10.1117/12.550867

KEYWORDS: Mirrors, Telescopes, Optical alignment, Light emitting diodes, Ocean optics, Prototyping, Interferometers, Optical fabrication, Alignment procedures, Inspection

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Proceedings Article | 20 October 2004 Paper

Paper

Precision narrow-angle astrometry of binary stars with the Navy Prototype Optical Interferometer

J. Armstrong, James Clark, G. Gilbreath, Robert Hindsley, Donald Hutter, David Mozurkewich, Thomas Pauls

Proceedings Volume 5491, (2004) https://doi.org/10.1117/12.553062

KEYWORDS: Stars, Planets, Interferometry, Binary data, Interferometers, Spectroscopy, Prototyping, Observatories, Optical interferometry, Visibility

Read Abstract +

Proceedings Article | 2 January 2002 Paper

Paper

Operational experience with the Navy Prototype Optical Interferometer (NPOI)

Nathaniel White, David Mozurkewich, Donald Hutter, James Benson, Christian Hummel, James Clark

Proceedings Volume 4844, (2002) https://doi.org/10.1117/12.460763

KEYWORDS: Interferometers, Mirrors, Prototyping, Optical alignment, Stars, Telescopes, Electronics, Observatories, Control systems, Optical tracking

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Proceedings Article | 24 July 1998 Paper

Paper

Infrastructure and the layout of the Navy Prototype Optical Interferometer at the Lowell Observatory

Nathaniel White, David Mozurkewich, J. Thomas Armstrong, Donald Hutter, Kenneth Johnston, James Clark, Long Ha

Proceedings Volume 3350, (1998) https://doi.org/10.1117/12.317113

KEYWORDS: Buildings, Interferometers, Observatories, Electronics, Telescopes, Prototyping, Roads, Control systems, Metals, Imaging arrays

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Proceedings Article | 24 July 1998 Paper

Paper

Design of the long delay lines for the Navy Prototype Optical Interferometer

James Clark, Long Ha, David Mozurkewich, J. Thomas Armstrong

Proceedings Volume 3350, (1998) https://doi.org/10.1117/12.317118

KEYWORDS: Mirrors, Light emitting diodes, Charge-coupled devices, Interferometers, Prototyping, Aluminum, Ocean optics, CCD cameras, Optical alignment, Actuators

Read Abstract +

Showing 5 of 44 publications

Conference Committee Involvement (1)

Interferometry and Structured Light 2024

21 August 2024 | San Diego, California, United States

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