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Technology for Space Optical Interferometry
Optical interferometers are expected to provide the next great leap forward in space based astronomy beyond the Hubble Space Telescope. Various systems are envisioned, ranging from large orbiting structures to lunar based facilities to separated spacecraft flying in formation. Regardless of the specific architecture, these systems will present unprecedented challenges in the measurement and control of optical surfaces, hence driving the technological state-of-the-art in the areas of laser metrology and alignment and stabilization of optomechanical systems.
On Absolute Phase Determination Techniques on SAR Interferometry
Cross-track interferometric SAR can provide 3-dimensional radar images. The technique relies on
On the Derivation of Coseismic Displacement Fields Using Differential Radar Interferometry: The Landers Earthquake
We develop here a map of the coseismic displacement field resulting from the Landers, Ca., June 28, 1992 earthquake derived using data acquired from an orbiting high resolution radar system only,and achieve results more accurate than previous space studies and similar in accuracy to those obtained by conventional field survey techniques.
Technology for Space Optical Interferometry
The Micro-Precision Control/Structure Interaction (CSI) program at JPL is chartered to develop the structures and control technology needed for sub-micron level stabilization of future optical space systems. The extreme dimensional stability required for such systems derives from the need to maintain the alignment and figure of critical optical elements to a small fraction (typically 1/20th to 1/50th) of the wavelength of detected radiation (about 0.5 micron for visible light, 0.1 micron for ultraviolet light). This requirement is common to a broad class of optical sysetms. The challenge for CSI arises when such systems become large, with spatially distributed optical elements mounted on lightweight, flexible structure. This paper will present an overview of the approach that is being taken by JPL's CSI program to address this challenge. In particular, the paper will discuss the application of CSI technology to a specific example of a future large optical space mission. Experimental demonstration of the technology on ground-based testbeds will also be presented.
Metrology system for Space Interferometry Mission system testbed 3
In a 3-baseline interferometer fourteen metrology gauges are used to monitor changes in the two baselines and calculate the length of the third. Simulation for estimating the third baseline indicates measurement capability of better than 1 nm error.
The International Celestial Reference Frame as Realized by Very Long Baseline Interferometry
A quasi-inertial reference frame is defined based on the radio positions of 212 extragalactic sources distributed over the entire sky.
Space interferometry mission: flight system and configuration overview
This paper addresses the issues of the System Engineering processes and validation of performance specifications. It also describes the current status of the SIM Reference System Design.
On Multidisciplinary Modeling of the Space Interferometry Mission
This paper provides an overview of the multidisciplinary integrated modeling methodology for SIM that encompasses the optics, structures, dynamics and control disciplines within a common software environment.
The Space Interferometry Mission
In this paper we will present selected topics from the SIM science program focusing on some specific astronomical questions to be addressed.
In-line detection of salt formation during vitrification using millimeter wave radiometry and interferometry
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