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  • Instrumentation and Photography  (19)
  • ASTRONOMY  (14)
  • Astronomy; Optics  (1)
  • 1
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    The nulling coronagraph: using a nulling interferometer for planet detection in visible light with a single aperture telescope (2003)
    In:  Other Sources
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    Publication Date: 2018-06-08
    Keywords: Instrumentation and Photography
    Type: Innovative Designs for the Next Large Aperture Optical/UV Telescope (NHST); Baltimore, MD; United States
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  • 2
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    The nulling coronagraph: planet detection in visible light with a single aperture telescope and nulling interferometer (2003)
    In:  Other Sources
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    Publication Date: 2018-06-08
    Keywords: Instrumentation and Photography
    Type: Toward Other Earths: Darwin/TPF and the Search for Extrasolar Terrestrial Planets; Heidelberg; Germany
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  • 3
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    Indirect planet detection with ground-based long-baseline interferometry (1994)
    In:  Other Sources
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    Publication Date: 2011-08-24
    Description: Narrow-angle astrometry with long-baseline infrared interferometers can provide extremely high accuracies as required for indirect planet detection. Narrow-angle astrometric interferometry exploits the properties of atmospheric turbulence over fields smaller than the interferometer baseline divided by the atmospheric scale height. For such fields, accuracy is linear with star separation, and nearly inversely proportional to baseline length. To exploit these properties, the interferometer observes a relatively bright (less than 13 mag(sub K)) target in the near infrared at 2.2 micrometers, and uses phase referencing to find a reference star within the 2.2-micrometers isoplanatic patch. With this technique faint references can be found for most targets. With baselines greater than 100 m, which also minimize photon-noise errors, and with careful control of systematic errors by using laser metrology, accuracies of tens of microarcseconds/square root of (hour) should be possible.
    Keywords: ASTRONOMY
    Type: Astrophysics and Space Science (ISSN 0004-640X); 212; p. 385-390
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  • 4
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    Potential of long-baseline infrared interferometry for narrow-angle astrometry (1992)
    In:  Other Sources
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    Publication Date: 2011-08-24
    Description: Narrow-angle astrometry has many astrophysical applications, from the measurement of parallaxes to the search for planets around nearby stars. Ground-based long-focus telescopes with photoelectric detectors have achieved accuracies of about 2-3 milliarcsec in 1 h. This accuracy is limited primarily by the atmosphere, and is consistent with models of atmospheric turbulence. However, applying these turbulence models to observations with long-baseline interferometers yields astrometric errors that are far smaller than can be achieved with long-focus telescopes. The predictions for the ultimate accuracy of ground-based narrow-angle astrometry using long-baseline IR (2.2 micron) stellar interferometers are very promising. With the excellent seeing at a high altitude site like Mauna Kea, the atmospheric limit for a 1 h astrometric measurement is expected to be of the order of 10 microarcsec for 1 h of integration. This two-order-of-magnitude improvement over conventional measurements is due to two effects. One is that a long-baseline IR interferometer can find useful reference stars very near an arbitrary target star, so that the atmospherically-induced motions of both stars are highly correlated. The second is that the baseline length can be much larger than the separation of the stellar beams in the turbulent atmosphere, resulting in a reduction in astrometric error with increasing baseline length.
    Keywords: ASTRONOMY
    Type: Astronomy and Astrophysics (ISSN 0004-6361); 262; 1; p. 353-358.
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  • 5
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    Long-baseline optical and infrared stellar interferometry (1992)
    In:  Other Sources
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    Publication Date: 2011-08-24
    Description: The history and the current status of optical and infrared long-baseline interferometry are reviewed. In particular, attention is given to Michelson interferometry; the Mark III stellar interferometer and its applications to astrometry, measurement of stellar diameters, and observations of binary stars; and advanced techniques. The discussion then focuses on astrometry and imaging with space interferometers. Finally, the future of long-baseline interferometry is briefly discussed with particular reference to the interferometry of the moon.
    Keywords: ASTRONOMY
    Type: In: Annual review of astronomy and astrophysics. Vol. 30 (A93-25826 09-90); p. 457-498.
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  • 6
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    Angular diameter measurements of stars (1991)
    In:  Other Sources
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    Publication Date: 2011-08-19
    Description: Angular diameters determined with the Mark III Optical Interferometer are presented for 12 stars at wavelengths of 450 and 800 nm. The uniform disk diameters resulting from fits to the visibility observations have rms residuals of order 1 percent for the 800 nm measurements and less than 3 percent for the 450 nm measurements. The improvement over previous observations with this instrument is due to improved data analysis and the use of a wider range of baseline lengths. An analysis of the calibration systematics for the Mark III Optical Interferometer is included. There is good agreement between these measurements and previously published data. The changes in uniform disk diameter between wavelengths of 450 and 800 nm agree with models of stellar atmospheres.
    Keywords: ASTRONOMY
    Type: Astronomical Journal (ISSN 0004-6256); 101; 2207-221
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  • 7
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    Wide-angle astrometry with the Mark III stellar interferometer (1990)
    In:  Other Sources
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    Publication Date: 2011-08-19
    Description: Astrometric measurements made with the Mark III stellar interferometer on five nights in August-September 1988 yielded average formal 1-sigma errors for 12 FK5 stars of 6 mas in declination and 10 mas in right ascension. This improvement in precision over previously reported measurements with this instrument made in 1986 is attributable to several factors: a second 12 m baseline; oriented E-S, was added to the instrument to improve the determination of right ascension; two-color analysis was included in the data-reduction process, along with a new central-fringe identification algorithm using three spectral channels, in order to reduce atmospheric errors; thermal control was greatly improved; and changes were made to observational procedures and hardware to monitor variations in the delay offset due to residual thermal drifts. Approximately half of the new positions are within 50 mas of their FK5 positions. However, an extended series of measurements are needed to ascertain the accuracy that can be achieved by interferometry.
    Keywords: ASTRONOMY
    Type: Astronomical Journal (ISSN 0004-6256); 100; 1701-171
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  • 8
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    A Dual 3-Element Nulling Interferometer for TPF (1999)
    In:  Other Sources
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    Publication Date: 2018-06-08
    Description: We present an interferometer that provides a null at the star and a direct measurement of both visibility amplitude and phase of the planets.
    Keywords: Instrumentation and Photography
    Type: Working on the Fringe Conference; Dana Point, CA; United States
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  • 9
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    A Common-path, Multi-channel Heterodyne Laser Interferometer for Sub-Nanometer Surface Metrology (1999)
    In:  Other Sources
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    Publication Date: 2018-06-08
    Keywords: Instrumentation and Photography
    Type: Optical Engineering for Sensing and Nanotechnology; Yokohama; Japan
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  • 10
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    A Common-path, Multi-channel Heterodyne Laser Interferometer for Sub-nanometer Surface Metrology (1999)
    In:  Other Sources
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    Publication Date: 2018-06-08
    Description: A multi-channel heterodyne laser interferometer is proposed for the JPL Thermo-Opto-Mechanical Testbed, which requires the measurement of optical surface deformations at the sub-nanometer level.
    Keywords: Instrumentation and Photography
    Type: Optical Engineering for Sensing and Nanotechnology; Yokohama; Japan
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