Engineering topics
White, V.
Publications and source records attributed to White, V..
WFIRST Coronagraph Starlight Suppression Technology Progress
No abstract available
Measurement of Spatial Filtering Capabilities of Single Mode Infrared Fibers
Spatial filtering is necessary to achieve deep nulls in optical interferometer and single mode infrared fibers can serve as spatial filters. The filtering function is based on the ability of these devices to perform the mode-cleaning function: only the component of the input field that is coupled to the single bound (fundamental) mode of the device propagates to the output without substantial loss. In practical fiber devices, there are leakage channels that cause light not coupled into the fundamental mode to propagate to the output. These include propagation through the fiber cladding and by means of a leaky mode. We propose a technique for measuring the magnitude of this leakage and apply it to infrared fibers made at the Naval Research Laboratory and at Tel Aviv University.
Nano-fabricated size exclusion chromatograph
This poster describes the development of a nano-fabricated size exclusion chromatograph (nSEC) based on the principle that molecules traveling through a microcolumn containing nano-fabricated features will have characteristics elution times that directly correlate to molecular weight.
Nano-fabricated size exclusion chromatograph
This paper describes the development of a nano-fabricated size exclusion chromatograph (nSEC) based on the principle that molecules traveling through amicrocolumn containing nano-fabricated features will have characteristic elution times that directly correlate to molecular weight. Compared to conventional size exclusion chromatography, the nSEC offers greater control over the size exclusion process; mass fabrication; integration of the separation column with associated valves, pumps, and detectors; and dramatic reductions in instrument mass and power requirements.
JPL micro-thrust propulsion activities
Formation flying and microspacecraft constellation missions pose new propulsion requirements. Formationflying spacecraft, due to the tight positioning and pointing control requirements, may need thrust control within 1- 20 uN to an accuracy of 0.1 uN for LISA and ST-7, for example. Future missions may have extended thrust ranges into the sub - mN range. However, all do require high specific impulses (>500 sec) due to long required thruster firings.
Integrated magnetic components for distributed power conversion
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MEMS fabrication of a microelectrode for local electrode atom probe microanalysis
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An overview of MEMS-based micropropulsion development at JPL
Development of MEMS (Microelectromechanical Systems) micropropulsion at the Jet Propulsion Laboratory (JPL) is reviewed. This includes a vaporizing liquid micro-thruster for microspacecraft attitude control, a micro-ion emgine for microspacecraft primary propulsion or large spacecraft fine attitude control, as well as several valve studies, including a solenoid valve studied in collaboration with Moog Space Products Division, and a piezoelectric micro-valve.
Integration of Passive Components for Spacecraft Avionics
The NASA roadmap outlining future deep space missions to Europa and other outer planetary destinations calls for continued reductions in the mass and volume of the spacecraft avionics. Spacecraft power electronics, including the power switches and converters, remain difficult to miniaturize due to the need for large numbers of discrete passive components such as resistors, capacitors, inductors and transformers. As part of the System-on-a-chip program at the Center for Integrated Space Microsystems and at the University of Arkansas, we are working to develop integrated or embedded passive components geared specifically for use in power management and distribution (PMAD) in future avionics over the next five to ten years. This will not only enable a scaling down of the power subsystems, but will make possible new architectures such as "distributed" PMAD. Additional information is contained in the original extended abstract.
Fabrication and testing of all solid-state micro-sale lithium batteries for microspacecraft applications
A microfabrication process has been developed to prepare thin film solid state lithium batteries as small as 50 mu m x 50 mu m.
Microinductors for spacecraft power electronics
This paper will focus on the development of microinductors for a 1-10 MHz integrated dc-dc converter for space applications.
Microinductors for Spacecraft Power Electronics
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MEMS technology at NASA's Jet Propulsion Laboratory
The MEMS Technology Group is part of the Microdevices Laboratory (MDL) at the Jet Propulsion Laboratory (JPL). The group pursues the development of a wide range of advanced MEMS technologies that are primarily applicable to NASA's robotic as well as manned exploration missions.
Thick Film UV Lithography Fabrication of Large Area, Fine Pitch Collimating Grids for X-Ray Astronomy
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Towards Micropropulsion Systems on-a-Chip: Initial Results of Component Feasibility Studies
Recent advances in the development of several micropropulsion components performed at JPL for microscpacecraft applications are reported upon.