Mr. Robert D. Christensen Profile

Robert D. Christensen

SMA Engineering Manager at Smithsonian Astrophysical Observatory

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Publications (9)

Proceedings Article | 13 December 2020 Poster + Paper

A distributed Raspberry-Pi control system for wSMA frontend

C.-Y. Edward Tong, P. S. Leiker, Robert Wilson, Ram Rao, Brian Force, Paul Grimes, Nimesh Patel, Robert Christensen

Proceedings Volume 11453, 114533V (2020) https://doi.org/10.1117/12.2561887

KEYWORDS: Control systems, Spectroscopy, Receivers, Oscillators, Polarization, Switches, Waveguides, Attenuators, Temperature metrology, Bandpass filters

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Proceedings Article | 6 July 2018 Paper

The WIYN one degree imager in 2018: an extended 30-detector focal plane

Daniel Harbeck, Mike Lesser, Wilson Liu, Bob Stupak, Ron George, Ron Harris, Gary Poczulp, Jayadev Rajagopal, Ralf Kotulla, David Ouellete, Eric Hooper, Michael Smith, Dustin Mason, Peter Onaka, Greg Chin, Emily Hunting, Robert Christensen

Proceedings Volume 10702, 1070229 (2018) https://doi.org/10.1117/12.2311528

KEYWORDS: Sensors, Camera shutters, Telescopes, Stray light, Calibration, Charge-coupled devices, Image processing, Data processing, Mirrors, Imaging systems

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Proceedings Article | 23 July 2014 Paper

Vector near-field beam scanner for the SMA

Robert Christensen, Ramprasad Rao, T. Sridharan, Edward Tong

Proceedings Volume 9153, 915330 (2014) https://doi.org/10.1117/12.2057124

KEYWORDS: Receivers, Mirrors, Scanners, Antennas, Shape memory alloys, Transmitters, Polarization, Near field, Astronomy, Near field optics

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Proceedings Article | 22 July 2014 Paper

The Greenland Telescope (GLT): antenna status and future plans

Philippe Raffin, Juan Carlos Algaba-Marcosa, Keiichi Asada, Raymond Blundell, Roberto Burgos, Chih-Cheng Chang, Ming-Tang Chen, Robert Christensen, Paul Grimes, C. Han, Paul T. Ho, Yau-De Huang, Makoto Inoue, Patrick Koch, Derek Kubo, Steve Leiker, Ching-Tang Liu, Pierre Martin-Cocher, Satoki Matsushita, Masanori Nakamura, Hiroaki Nishioka, George Nystrom, Scott Paine, Nimesh Patel, Nicolas Pradel, Hung-Yi Pu, H.-Y. Shen, William Snow, Tirupati Sridharan, Ranjani Srinivasan, Edward Tong, Jackie Wang

Proceedings Volume 9145, 91450G (2014) https://doi.org/10.1117/12.2056836

KEYWORDS: Antennas, Telescopes, Inspection, Prototyping, Servomechanisms, Computer programming, Manufacturing, Carbon, Reflectors, Astrophysics

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Proceedings Article | 12 July 2008 Paper

Overview of engineering activities at the SMA

R. Christensen, D. Kubo, Ramprasad Rao

Proceedings Volume 7016, 701608 (2008) https://doi.org/10.1117/12.787673

KEYWORDS: Receivers, Antennas, Shape memory alloys, Optical correlators, Cameras, Ozone, Telescopes, Observatories, Polarization, Astronomy

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Proceedings Article | 10 July 2008 Paper

The eSMA: description and first results

Sandrine Bottinelli, Ken Young, Richard Chamberlin, Remo P. Tilanus, Mark Gurwell, Dave Wilner, Hiroko Shinnaga, Hiroshige Yoshida, Per Friberg, Huib Jan van Langevelde, Ewine van Dishoeck, Michiel Hogerheijde, A. Meredith Hughes, Robert Christensen, Richard Hills, John Richer, Emily Curtis

Proceedings Volume 7012, 70120D (2008) https://doi.org/10.1117/12.788949

KEYWORDS: Shape memory alloys, Antennas, Galactic astronomy, Spatial resolution, Stars, Calibration, Absorption, Polarization, Observatories, Receivers

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Proceedings Article | 27 June 2006 Paper

Characterization of instrumental phase stability

D. Kubo, T. Hunter, R. Christensen, P. Yamaguchi

Proceedings Volume 6275, 62751Y (2006) https://doi.org/10.1117/12.672927

KEYWORDS: Antennas, Receivers, Analog electronics, Oscillators, Astronomy, Calibration, Phase measurement, Shape memory alloys, Control systems, Optical correlators

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Proceedings Article | 29 September 2004 Paper

Holographic surface setting of the Sub-millimeter Array antennas

Tirupati Sridharan, Masao Saito, Nimesh Patel, Robert Christensen

Proceedings Volume 5495, (2004) https://doi.org/10.1117/12.550939

KEYWORDS: Antennas, Holography, Shape memory alloys, Near field, Astronomy, Spatial resolution, Telescopes, Receivers, Efficient operations, Optical testing

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Proceedings Article | 13 December 2002 Paper

Receiver control for the submillimeter array

Todd Hunter, Robert Wilson, Robert Kimberk, P. Leiker, Robert Christensen

Proceedings Volume 4848, (2002) https://doi.org/10.1117/12.461362

KEYWORDS: Receivers, Microcontrollers, Calibration, Oscillators, Antennas, Computer programming, Shape memory alloys, Actuators, Servomechanisms, Attenuators

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Showing 5 of 9 publications

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