Dr. Theodore J. Hadjimichael Profile

Dr. Theodore J. Hadjimichael

Electronics Engineer at NASA Goddard Space Flight Ctr

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Author

Publications (33)

Proceedings Article | 24 August 2024 Presentation

Picometer-level metrology of test articles on the road to Habitable Worlds Observatory

Breann Sitarski, Babak Saif, Marcel Bluth, Peter Petrone, Perry Greenfield, Lee Feinberg, Sang Park, Michael Eisenhower, Thomas Zielinski, Ritva Keski-Kuha, Theodore Hadjimichael, Stephen Hagopian

Proceedings Volume 13092, 130921R (2024) https://doi.org/10.1117/12.3018843

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Proceedings Article | 23 August 2024 Presentation + Paper

LISA telescope development status and flight design

Ritva Keski-Kuha, Ryan Derosa, Kevin Boyce, Theodore Hadjimichael, Joseph Howard, Joseph Ivanov, Timothy Johnson, Joshua Lutter, Jonathan Papa, Shannon Sankar, Andrew Weaver

Proceedings Volume 13092, 130922C (2024) https://doi.org/10.1117/12.3019158

KEYWORDS: Telescopes, Space operations, Optical benches, Design, Engineering, Optical fabrication, Optical alignment, Mirrors, Wavefront errors

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SPIE Journal Paper | 10 April 2021 Open Access

Enabling precision coordinate metrology for universal optical testing and alignment applications (Erratum)

Manal Khreishi, Raymond Ohl, Joseph Howard, Jonathan Papa, Ryan McClelland, Clark Hovis, Theodore Hadjimichael, Patrick Thompson, Kenneth Ranson, Rongguang Liang, Nicolas Gorius

OE, Vol. 60, Issue 04, 049801, (April 2021) https://doi.org/10.1117/12.10.1117/1.OE.60.4.049801

KEYWORDS: Optical testing, Optical alignment, Metrology, Optical engineering, Geometrical optics

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SPIE Journal Paper | 15 March 2021

Enabling precision coordinate metrology for universal optical testing and alignment applications

Manal Khreishi, Raymond Ohl, Joseph Howard, Jonathan Papa, Ryan McClelland, Clark Hovis, Theodore Hadjimichael, Patrick Thompson, Kenneth Ranson, Rongguang Liang, Nicolas Gorius

OE, Vol. 60, Issue 03, 035106, (March 2021) https://doi.org/10.1117/12.10.1117/1.OE.60.3.035106

KEYWORDS: Metrology, Mirrors, Optical testing, Optical alignment, Optical engineering, Interferometry, Optical fabrication, Aspheric lenses, Terbium, Lawrencium

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Proceedings Article | 22 August 2017 Paper

Alignment and testing of critical interface fixtures for the James Webb Space Telescope

Kyle McLean, Paul Bagdanove, Joshua Berrier, Emmanuel Cofie, Tiffany Glassman, Theodore Hadjimichael, Eric Johnson, Joshua Levi, Amy Lo, Joseph McMann, Raymond Ohl, Dean Osgood, James Parker, Kevin Redman, Vicki Roberts, Matthew Stephens, Adam Sutton, Greg Wenzel, Jerrod Young

Proceedings Volume 10377, 103770H (2017) https://doi.org/10.1117/12.2272790

KEYWORDS: James Webb Space Telescope, Observatories, Optical alignment, Metrology, Space telescopes, Infrared telescopes, Astronomical telescopes, Telescopes

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Proceedings Article | 22 August 2017 Paper

Metrology for trending alignment of the James Webb Space Telescope before and after ambient environmental testing

Theo Hadjimichael, Raymond Ohl, Josh Berrier, Jeff Gum, Joseph Hayden, Manal Khreishi, Kyle McLean, Kevin Redman, Joseph Sullivan, Greg Wenzel, William Eichhorn, Jerrod Young

Proceedings Volume 10377, 103770I (2017) https://doi.org/10.1117/12.2273991

KEYWORDS: James Webb Space Telescope, Metrology, Space telescopes, Mirrors, Optical alignment, Telescopes, Infrared telescopes, Optical components, Optical fabrication, Astronomical telescopes

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Proceedings Article | 20 October 2016 Presentation + Paper

A toolbox of metrology-based techniques for optical system alignment

Phillip Coulter, Raymond Ohl, Peter Blake, Brent Bos, Victor Chambers, William Eichhorn, Jeffrey Gum, Theodore Hadjimichael, John Hagopian, Joseph Hayden, Samuel Hetherington, David Kubalak, Kyle Mclean, Joseph McMann, Kevin Redman, Henry Sampler, Greg Wenzel, Jerrod Young

Proceedings Volume 9951, 995108 (2016) https://doi.org/10.1117/12.2239070

KEYWORDS: Optical alignment, Metrology, Optical components, James Webb Space Telescope, Mirrors, Telescopes, Lawrencium, Sensors, Spherical lenses, Optical benches

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Proceedings Article | 18 October 2016 Paper

Alignment of the James Webb Space Telescope Integrated Science Instrument Module Element

Theo Hadjimichael, Raymond Ohl, Scott Antonille, David Aronstein, Andrew Bartoszyk, Josh Berrier, Emmanuel Cofie, Phil Coulter, Renee Gracey, Joseph Hayden, Joseph Howard, Jason Hylan, David Kubalak, Kyle McLean, Cherie Miskey, Kevin Redman, Scott Rohrbach, Derek Sabatke, Randal Telfer, Greg Wenzel, Thomas Zielinski, Joseph Sullivan, George Hartig, William Eichhorn

Proceedings Volume 9951, 99510C (2016) https://doi.org/10.1117/12.2238829

KEYWORDS: Optical alignment, James Webb Space Telescope, Cryogenics, Metrology, Virtual colonoscopy, Interfaces, Calibration, Computer aided design, Mirrors, Finite element methods

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Proceedings Article | 29 July 2016 Paper

Alignment of the James Webb Space Telescope optical telescope element

Tiffany Glassman, Joshua Levi, Till Liepmann, Walter Hahn, Gary Bisson, Dan Porpora, Theo Hadjimichael

Proceedings Volume 9904, 99043Z (2016) https://doi.org/10.1117/12.2233792

KEYWORDS: Mirrors, James Webb Space Telescope, Optical alignment, Space telescopes, Optical components, Space telescopes, Optical telescopes, Adaptive optics, Data modeling, Telescopes, Shape memory alloys

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Proceedings Article | 8 September 2014 Paper

Ambient optomechanical alignment and pupil metrology for the flight instruments aboard the James Webb Space Telescope

Phillip Coulter, Alexander Beaton, Jeffery Gum, Theodore Hadjimichael, Joseph Hayden, Susann Hummel, Jason Hylan, David Lee, Timothy Madison, Michael Maszkiewicz, Kyle Mclean, Joseph McMann, Markus Melf, Linda Miner, Raymond Ohl, Kevin Redman, Andreas Roedel, Paul Schweiger, Maurice Te Plate, Martyn Wells, Greg Wenzel, Patrick Williams, Jerrod Young

Proceedings Volume 9195, 91950G (2014) https://doi.org/10.1117/12.2065017

KEYWORDS: Lawrencium, Silicon, Optical alignment, Virtual colonoscopy, James Webb Space Telescope, Metrology, Space telescopes, Telescopes, Finite element methods, Mirrors

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Proceedings Article | 3 September 2010 Paper

Cryogenic metrology for the James Webb Space Telescope Integrated Science Instrument Module alignment target fixtures using laser radar through a chamber window

T. Hadjimichael, D. Kubalak, A. Slotwinski, P. Davila, B. Eegholm, W. Eichhorn, J. Hayden, E. Mentzell, R. Ohl, G. Scharfstein, R. Telfer

Proceedings Volume 7793, 77930B (2010) https://doi.org/10.1117/12.862693

KEYWORDS: Lawrencium, Cryogenics, Metrology, James Webb Space Telescope, LIDAR, Aluminum, Optical alignment, Temperature metrology, Calibration, Atmospheric modeling

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Proceedings Article | 29 July 2010 Paper

Wavefront sensing of x-ray telescopes

Timo Saha, Scott Rohrbach, Theo Hadjimichael, William Zhang

Proceedings Volume 7732, 77322S (2010) https://doi.org/10.1117/12.857608

KEYWORDS: Point spread functions, Mirrors, Space telescopes, Diffraction, James Webb Space Telescope, X-ray telescopes, Phase retrieval, Grazing incidence, Telescopes, Wavefront sensors

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Proceedings Article | 31 August 2009 Paper

Progress toward a complete metrology set for the International X-ray Observatory (IXO) soft x-ray mirrors

J. Lehan, M. Atanossova, K.-W. Chan, T. Hadjimichael, T. Saha, M. Hong, W. Zhang, P. Blake

Proceedings Volume 7437, 74370R (2009) https://doi.org/10.1117/12.826625

KEYWORDS: Mirrors, Metrology, X-rays, Interferometers, Distortion, Calibration, Time metrology, Observatories, Spatial frequencies, X-ray telescopes

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Proceedings Article | 22 August 2009 Paper

An alignment procedure for multi-element precision cylinder lenses and modular enclosure to house them

J. Lehan, G. Byron, R. McClelland, T. Hadjimichael, R. Russell, D. Robinson

Proceedings Volume 7433, 743308 (2009) https://doi.org/10.1117/12.826636

KEYWORDS: Computer generated holography, Lenses, Wavefronts, Interferometers, Alignment procedures, Optical alignment, Temperature metrology, Multi-element lenses, X-ray telescopes, Aluminum

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Proceedings Article | 30 April 2009 Paper

Mirror technology development for the International X-Ray Observatory (IXO) mission

W. Zhang, J. Bolognese, G. Byron, K. W. Chan, D. Content, T. Hadjimichael, Charles Hewitt, M. Hill, M. Hong, J. Lehan, L. Lozipone, J. Mazzarella, R. McClelland, D. Nguyen, L. Olsen, R. Petre, D. Robinson, S. Rohrbach, R. Russell, T. Saha, M. Sharpe, M. Gubarev, W. Jones, S. O'Dell, W. Davis, D. Caldwell, M. Freeman, W. Podgorski, P. Reid

Proceedings Volume 7360, 73600J (2009) https://doi.org/10.1117/12.833544

KEYWORDS: Mirrors, X-rays, Metrology, Observatories, Glasses, X-ray optics, X-ray technology, Coating, Image segmentation, Optical alignment

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Proceedings Article | 25 July 2008 Paper

Some considerations for precision metrology of thin x-ray mirrors

J. Lehan, T. Saha, W. Zhang, S. Owens Rohrbach, K.-W. Chan, T. Hadjimichael, M. Hong, W. Davis

Proceedings Volume 7018, 701815 (2008) https://doi.org/10.1117/12.789798

KEYWORDS: Mirrors, Metrology, X-ray telescopes, X-rays, Telescopes, Kinematics, Space telescopes, Mirror mounts, Interferometers, Aerospace engineering

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Proceedings Article | 15 July 2008 Paper

X-ray imaging tests of Constellation-X SXT mirror segment pairs

S. Owens Rohrbach, T. Hadjimichael, L. Olsen, Kai-Wing Chan, J. Lehan, P. Reid, R. Petre, S. O'Dell, T. Saha, W. Zhang

Proceedings Volume 7011, 701134 (2008) https://doi.org/10.1117/12.789838

KEYWORDS: Mirrors, Image segmentation, X-ray imaging, X-rays, Optical metrology, X-ray telescopes, Space mirrors, Space telescopes, Image quality, Aerospace engineering

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Proceedings Article | 14 July 2008 Paper

Constellation-X mirror technology development

W. Zhang, J. Bolognese, G. Byron, K. Chan, D. Content, T. Hadjimichael, Charles He, M. Hill, M. Hong, J. Lehan, L. Lozipone, J. Mazzarella, R. McClelland, D. Nguyen, L. Olsen, R. Petre, D. Robinson, S. Rohrbach, R. Russell, T. Saha, M. Sharpe, M. Gubarev, W. Jones, S. O'Dell, W. Davis, D. Caldwell, M. Freeman, W. Podgorski, P. Reid

Proceedings Volume 7011, 701103 (2008) https://doi.org/10.1117/12.788453

KEYWORDS: Mirrors, X-rays, Glasses, Metrology, Coating, Distortion, X-ray optics, Observatories, Optical alignment, Image segmentation

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Proceedings Article | 3 October 2007 Paper

Constellation-X mirror technology development

W. Zhang, J. Bolognese, K. W. Chan, D. Content, T. Hadjimichael, Charles He, M. Hong, J. Lehan, J. Mazzarella, D. Nguyen, L. Olsen, S. Owens, R. Petre, T. Saha, M. Sharpe, J. Sturm, T. Wallace, M. Gubarev, W. Jones, S. O'Dell, W. Davis, M. Freeman, W. Podgorski, P. Reid

Proceedings Volume 6688, 668802 (2007) https://doi.org/10.1117/12.731872

KEYWORDS: Mirrors, X-rays, Metrology, X-ray optics, Epoxies, Image segmentation, Observatories, Glasses, X-ray technology, Spatial resolution

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Proceedings Article | 3 October 2007 Paper

Toward a complete metrologic solution for the mirrors for the Constellation-X Spectroscopy x-ray telescope

J. Lehan, S. Owens, T. Hadjimichael, M. Hong, K.-W. Chan, T. Saha, P. Reid, W. Zhang

Proceedings Volume 6688, 668818 (2007) https://doi.org/10.1117/12.733080

KEYWORDS: Mirrors, Metrology, X-ray telescopes, Interferometry, Spectroscopy, Interferometers, X-rays, Glasses, Calibration, Space telescopes

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Proceedings Article | 20 September 2007 Paper

Testing of the mirrors for the Constellation-X spectroscopy x-ray telescope with a refractive null

J. Lehan, T. Hadjimichael, C. Skocik

Proceedings Volume 6688, 668819 (2007) https://doi.org/10.1117/12.733096

KEYWORDS: Mirrors, Metrology, Distortion, X-ray telescopes, Glasses, Space telescopes, X-rays, Lens design, Spectroscopy, Telescopes

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Proceedings Article | 20 September 2007 Paper

An alignment and integration technique for mirror segment pairs on the Constellation-X telescope

Theo Hadjimichael, Scott Owens, John Lehan, Larry Olsen, Timo Saha, Tom Wallace, Will Zhang

Proceedings Volume 6688, 66881D (2007) https://doi.org/10.1117/12.734502

KEYWORDS: Mirrors, Image segmentation, Adhesives, Glasses, X-rays, Image quality, X-ray telescopes, Aerospace engineering, Space mirrors, Collimation

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SPIE Journal Paper | 1 July 2007 Open Access

Simple method of aligning cylindrical air-spaced elements

John Lehan, Theodore Hadjimichael, David Content

OE, Vol. 46, Issue 07, 070503, (July 2007) https://doi.org/10.1117/12.10.1117/1.2750656

KEYWORDS: Mirrors, Interferometers, Optical alignment, Aerospace engineering, Metrology, Cylindrical lenses, Fizeau interferometers, Diffractive optical elements, Prisms, Precision optics

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Proceedings Article | 7 September 2006 Paper

Stray light reduction in testing of NIRSpec subsystems: the focal plane array and micro-shutter assembly

Joseph Connelly, Theo Hadjimichael, Rene Boucarut, June Tveekrem, D. Brent Mott

Proceedings Volume 6291, 62910V (2006) https://doi.org/10.1117/12.678513

KEYWORDS: Camera shutters, Stray light, Sensors, Staring arrays, Optical testing, James Webb Space Telescope, Infrared radiation, Cryogenics, Fiber optic illuminators, Space telescopes

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Proceedings Article | 20 June 2006 Paper

Alignment and test of a Constellation-X SXT mirror segment pair

Scott Owens, Thomas Meagher, Theo Hadjimichael, John Lehan, David Content, Timo Saha, William Zhang, Rob Petre, Paul Reid, William Jones, Stephen O'Dell

Proceedings Volume 6266, 62661W (2006) https://doi.org/10.1117/12.672663

KEYWORDS: Mirrors, Image segmentation, Actuators, Interferometers, Collimation, Optical alignment, X-ray telescopes, Data centers, Data modeling, Sensors

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Proceedings Article | 8 October 2005 Paper

Design and fabrication of refractive nulls for testing the segmented mirrors of the Constellation-X spectroscopy x-ray telescope (SXT)

J. Lehan, T. Hadjimichael, D. Content, W. Zhang

Proceedings Volume 5900, 59001D (2005) https://doi.org/10.1117/12.615316

KEYWORDS: Chemical elements, Telescopes, Space telescopes, Wavefronts, Lens design, X-ray telescopes, Optical instrument design, Spectroscopy, Optical fabrication, Segmented mirrors

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Proceedings Article | 12 October 2004 Paper

Wavefront sensing using a multi-object spectrograph (NIRSpec)

Bruce Dean, Rene Boucarut, Jeffrey Smith, Theo Hadjimichael

Proceedings Volume 5487, (2004) https://doi.org/10.1117/12.550912

KEYWORDS: Wavefront sensors, Data modeling, Diffraction, James Webb Space Telescope, Phase retrieval, Spectrographs, Mirrors, Cameras, Point spread functions, Astronomical imaging

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Proceedings Article | 11 October 2004 Paper

Optical metrology for the segmented optics on the Constellation-X spectroscopy x-ray telescope

David Content, David Colella, Theo Hadjimichael, John Lehan, Joseph McMann, Paul Reid, Timo Saha, William Zhang

Proceedings Volume 5488, (2004) https://doi.org/10.1117/12.553231

KEYWORDS: Metrology, Computer generated holography, Mirrors, Reflectors, X-ray optics, X-ray telescopes, Interferometry, Profiling, Spectroscopy, Optical alignment

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Proceedings Article | 29 January 2004 Paper

Optical metrology for the segmented optics on the Constellation-X soft x-ray telescope

David Content, David Colella, Charles Fleetwood, Theo Hadjimichael, Timo Saha, Geraldine Wright, William Zhang

Proceedings Volume 5168, (2004) https://doi.org/10.1117/12.508144

KEYWORDS: Metrology, Mirrors, Interferometry, X-ray telescopes, Collimation, X-ray optics, Optical alignment, Profiling, Optical fabrication, X-rays

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Proceedings Article | 29 January 2004 Paper

Metrology of ultralightweight x-ray optics using noncontact laser triangulation probe

Theo Hadjimichael, David Content, Charles Fleetwood, Timo Saha, Eugene Waluschka, Geraldine Wright

Proceedings Volume 5168, (2004) https://doi.org/10.1117/12.507548

KEYWORDS: Mirrors, X-ray optics, Laser beam diagnostics, Metrology, X-rays, LabVIEW, Aluminum, Aerospace engineering, Glasses, Laser optics

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Proceedings Article | 7 March 2003 Paper

Imaging performance and modeling of the infrared multi-object spectrometer focal reducer

Joseph Connelly, Raymond Ohl, Timo Saha, Theo Hadjimichael, John Mentzell, Ronald Mink, Jason Hylan, Leroy Sparr, John Chambers, John Hagopian, Matthew Greenhouse, Robert Winsor, John MacKenty

Proceedings Volume 4841, (2003) https://doi.org/10.1117/12.458974

KEYWORDS: Mirrors, Telescopes, Space telescopes, Wavefronts, Infrared spectroscopy, Optical alignment, Spectroscopy, Sensors, Light scattering, Tolerancing

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Proceedings Article | 18 December 2002 Paper

Athermal lightweight aluminum mirrors and structures

Theo Hadjimichael, David Content, Charles Frohlich

Proceedings Volume 4849, (2002) https://doi.org/10.1117/12.476892

KEYWORDS: Mirrors, Aluminum, Foam, Relays, Polishing, Optical spheres, Lightweight mirrors, Solids, Diamond turning, Wave plates

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Proceedings Article | 30 January 2002 Paper

Grating groove metrology and efficiency predictions from the soft x-ray to the far infrared

David Content, Petar Arsenovic, Ivan Kuznetsov, Theo Hadjimichael

Proceedings Volume 4485, (2002) https://doi.org/10.1117/12.454276

KEYWORDS: Polarization, Metrology, Atomic force microscopy, Lithium, Diffraction gratings, Profilometers, Calibration, Reflection, Solids, Statistical modeling

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Showing 5 of 33 publications

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