Among the Keck Interferometer's high priority science programs will be the differential astrometric detection of planetary companions to nearby stars.

Binary stars Palomar Testbed interferometry Keck↗

NASA NTRS1999

The Visual Orbit of 64 Piscum

We report on the determination of the visual orbit of the double-lined spectroscopic binary system 64 Piscum with data obtained by the Palomar Testbed Interferometer in 1997 and 1998.

stellar astrophysics interferometry↗

NASA NTRS1999

Science with the Space Interferometry Mission

The Space Interferometry Mission (SIM) will be NASA's first space-based optical interferometer designed for precision astrometry.

Space↗

NASA NTRS1999

A Common-path, Multi-channel Heterodyne Laser Interferometer for Sub-nanometer Surface Metrology

A multi-channel heterodyne laser interferometer is proposed for measurement of optical surface deformations at the sub-nanometer level.

heterodyne interferometry metrology nano-technolog↗

NASA NTRS1999

A Common-path, Multi-channel Heterodyne Laser Interferometer for Sub-nanometer Surface Metrology

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.

heterodyne interferometry inferometric metrology n↗

NASA NTRS1999

A Common-path, Multi-channel Heterodyne Laser Interferometer for Sub-Nanometer Surface Metrology

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heterodyne interferometry metrology nano-technolog↗

NASA NTRS1999

A Dual 3-Element Nulling Interferometer for TPF

We present an interferometer that provides a null at the star and a direct measurement of both visibility amplitude and phase of the planets.

Nulling Interferometry Terrestrial Planet Finder↗

NASA NTRS1999

The Keck Interferometer: Instrument Overview and Proposed Science

The Keck Interferometer is being developed by JPL and CARA as one of the ground-based components of NASA's Origins Program.

Optical Interferometry astrometry nulling synthesi↗

NASA NTRS1999

Round Table Discussion: Science in a Political World

The conference Working on the Fringe ended with a round-table discussion of the bigger picture of what it takes to ensure science gets done, in this case optical and IR interferometry.

political world round table IR NASA headquarters↗

NASA NTRS1999

The Palomar Testbed Interferometer

The Palomar Testbed Interferometer (PTI) is a long-baseline infrared interferometer located at Palomar Observatory, California. It was built as a testbed for interferometric techniques applicable to the Keck Interferometer. First fringes were obtained in 1995 July. PTI implements a dual-star architecture, tracking two stars simultaneously for phase referencing and narrow-angle astrometry. The three fixed 40 cm apertures can be combined pairwise to provide baselines to 110 m. The interferometer actively tracks the white-light fringe using an array detector at 2.2 microns and active delay lines with a range of +/-38 m. Laser metrology of the delay lines allows for servo control, and laser metrology of the complete optical path enables narrow-angle astrometric measurements. The instrument is highly automated, using a multiprocessing computer system for instrument control and sequencing.

Colavita, M. M.↗

NASA NTRS1999

Space-Based Optical Projects

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Space Interferometery Mission planets astrometry↗

NASA NTRS1999

Differential Astrometry of the 61 Cygni System with the Palomar Testbed Interferometer

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instrumentation interferometry techniques astromet↗