Electronic Components
Semiconductor Nanomembrane-Based Flight Sensors and Arrays
Posted in Briefs, TSP, Electronic Components on Monday, 30 November 2015
These sensor arrays can be used to measure skin friction and pressure. John F. Kennedy Space Center, Florida There are two broad classes of methods for measuring skin friction (or wall shear): indirect and direct. The direct methods generally employ a movable element of the actual surface surrounded by a very small gap and connected to some type of flexure. One then measures the displacement of the movable element or the strain in the flexure to obtain the skin friction force acting on the movable element directly. Some methods of detecting skin friction relied on optical interferometric measurements of the thickness of an oil film applied to a test surface. The motion of the oil due to airflow creates thickness variations that can be associated to the frictional forces acting on the surface. Mapping of the surface over a small area is possible, but practical use of this technique is limited due to contamination of the tunnel by the free-flowing oil.
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Automated Break-Out Box for Use with Low-Cost Spacecraft Integration and Test
Posted in Briefs, TSP, Electronic Components on Monday, 30 November 2015
Goddard Space Flight Center, Greenbelt, Maryland Electrical checkout and testing is a critical part of the overall space integration and test flow. Verifying proper harness and connector signal interfaces is key to ensuring component health and overall system functionality. Break-out boxes (BOBs) are used to give test personnel access to electrical signals for probing, voltage injection, isolation checks, safe-to-mate checks, and voltage/current measurements, and comparing to expected results. Currently, this involves manually attaching multimeters and oscilloscopes to banana jacks on the BOB, taking measurements, and comparing to expected results.
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Radiation-Hardened 10BASE-T Ethernet Physical Interface (PHY)
Posted in Briefs, TSP, Electronic Components on Monday, 30 November 2015
Goddard Space Flight Center, Greenbelt, Maryland The EXPRESS Logistics Carrier (ELC) system was built by NASA Goddard for installation on the International Space Station (ISS). Four ELC systems are on ISS. Each ELC site includes two data nodes. The ELC requirements call for a radiation-hardened 10BASE-T Ethernet interface at each data node. The requirement for ELC was to support a full receive version of the interface, and only to provide a link pulse to the attached payloads on the transmit side of the interface. Further development required a full duplex version of a radiation-hardened 10BASE-T Ethernet interface to support the SpaceCube program.
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Radiation-Hardened, Quad 12-Bit Digital-to-Analog Converter ASIC
Posted in Briefs, TSP, Electronic Components on Monday, 30 November 2015
This circuit incorporates science-driven features based on applications in a realistic space environment. Goddard Space Flight Center, Greenbelt, Maryland This radiation-hardened, compact, low-power, quad 12-bit digital-to-analog converter (DAC) application specific integrated circuit (ASIC) incorporates science-driven features based on applications in a realistic space environment such as threshold setting, current bias circuits, and general-purpose DC voltage generation. It is based on a previous 10-bit DAC that exhibited excellent test results, presenting the possibility of a 12-bit design.
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Automated Generation of Failure Modes and Effects Document from a Simple SysML Model
Posted in Briefs, TSP, Electronic Components on Monday, 30 November 2015
NASA’s Jet Propulsion Laboratory, Pasadena, California This software queries a model of system in the MagicDraw program and uses that information to create an Excel spreadsheet that represents a basic FMEA (Failure Modes and Effects Analysis). It automates the generation of an FMEA; the user only has to open MagicDraw, then run this plugin to produce an Excel spreadsheet.
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Space Network Access System (SNAS)
Posted in Briefs, TSP, Electronic Components on Monday, 30 November 2015
Goddard Space Flight Center, Greenbelt, Maryland SNAS is a single, universally accessible, standards-based, full-featured customer interface for performing Tracking and Data Relay Satellite System (TDRSS) planning, scheduling, and real-time service monitoring and control. It consolidates functionality of multiple legacy customer interface systems into a single system, and is the primary access system for managing TDRSS resources.
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Creating Stretchy Conductors for Flexible Electronics
Posted in News, Electronic Components, Electronics, Diagnostics, Patient Monitoring on Wednesday, 09 September 2015
A team of engineers at Washington State University, Pullman, discovered how to stretch metal films used in flexible electronics to twice their size without breaking, which they say, could lead to dramatic improvements in flexible electronics. This may advance applications in bendable batteries, robotic skins, wearable monitoring devices and sensors, and connected fabrics.
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