Special Coverage

Lightweight, Flexible Thermal Protection System for Fire Protection
High-Precision Electric Gate for Time-of-Flight Ion Mass Spectrometers
Polyimide Wire Insulation Repair System
Distributed Propulsion Concepts and Superparamagnetic Energy Harvesting Hummingbird Engine
Wet Active Chevron Nozzle for Controllable Jet Noise Reduction
Magnetic Relief Valve
Active Aircraft Pylon Noise Control System
Unmanned Aerial Systems Traffic Management

Novel Electrochemical Cell Designs for Simultaneous Production of Methane and Oxygen via the Electrolysis of Carbon Dioxide and Water

The two-chamber cell design allows electrolysis of water and carbon dioxide in separate chambers to minimize production of unwanted products.NASA has investigated and demonstrated the simultaneous production of methane (CH4) and oxygen (O2) via the electrolysis of carbon dioxide (CO2) and water (H2O) in one or more ionic liquids (ILs). In order to improve the likelihood of methane and oxygen production, and to reduce the likelihood of unwanted side-product formation, several innovative approaches were investigated. Research has shown thousands of options for ionic liquids that can be used in the electrochemical process; however, care must be taken to choose an ionic liquid that has high carbon dioxide solubility, limited change in viscosity due to carbon dioxide absorption, and chemical stability during the electrochemical process.

Posted in: Briefs, Manufacturing & Prototyping


Eddy Current System and Method for Crack Detection

This probe can identify outer surface damage from within the interior of installed hardware.NASA's Langley Research Center has developed a new eddy current inspection device that probes for cracks in parts of metal structures that are often inaccessible without extensive disassembly. The probe is specially designed for insertion into the cavity of a part to inspect the surrounding structure in an outward direction. For example, the probe may be held inside a large, thick tube and pointed outward to inspect the outer diameter of the tube. NASA used the probe to test for stress corrosion cracking in the relief radius of Space Shuttle thrusters without having to dismantle the hardware, reducing inspection time while ensuring the health of the structure. NASA Langley is seeking organizations that would like to license the probe to test for cracks in rocket thrusters and other metallic structures with hard-to-reach inspection areas.

Posted in: Briefs, Sensors


Metal Stamping Design Guidelines

Metal Stamping provides an economical way to produce quantities of parts that can possess many qualities, including strength, durability, wear resistance, good conductive properties, and stability. In this paper, we are sharing some ideas that can help you design a part that optimizes all the features that the metal stamping process offers.

Posted in: Briefs, TSP, Aeronautics, Manufacturing & Prototyping, Materials, Mechanical Components


Electric Field Quantitative Measurement System and Method

This technology could be used for medical imaging, security applications, weather prediction, and nondestructive evaluation of composites and insulators.NASA Langley Research Center’s Electric Field Imaging (EFI) system is the only noncontact method capable of quantitatively measuring the magnitude and direction of electrostatic fields in near- and far-field applications. Based on low-cost, commercially available components, the EFI system uses measurement of very-low-current, human-safe electric fields to construct a three-dimensional image of objects and people based on their dielectric properties. This platform technology, originally developed for measurement of the efficacy of electrical shielding around cables, could be optimized for a variety of applications, including medical imaging, security and detection, weather and natural disaster prediction, and nondestructive evaluation of composites and insulators. The EFI system has the potential to offer a lower-cost, portable, and safer alternative to the imaging systems currently used in these applications.

Posted in: Briefs, Electronics & Computers


Auto-Balancing Series-Stacked Input DC-DC Converter

This invention could enable practical, reliable, and efficient power conversion in high-voltage DC systems without power level limitation.ADC-DC converter that can operate from a high input voltage is needed for future high-power space applications. However, the selection of space-qualified, high-voltage transistors and filter capacitors for such a converter are very limited. The available high-voltage components have lower performance than lower-voltage components. One possible solution to this problem is connecting in series the inputs of multiple converters to lower the input voltage at the individual converter inputs. However, because of component tolerances, performance degradation, and transient events, this can result in an unbalanced voltage distribution throughout the various inputs. Excessive voltage on any of the stacked converters can damage components and cause a catastrophic failure. A circuit that could inherently balance the voltage between the inputs of multiple low-voltage DCDC converters would have better performance and reliability.

Posted in: Briefs, Board-Level Electronics, Electronics & Computers, Power Management


Larger-Area Integrated Electrical Metallization Dielectric Structures with Stress-Managed Unit Cells for Extreme- Environment Semiconductor Electronics Chips

Electronic circuits that operate in high temperatures are used in automobiles, airplanes, oil drilling operations, and many other applications.The use of patterned multiple layers of thin films of metal and dielectric to form integrated circuit interconnections of transistors and/or form on-chip circuit capacitors is well known to those skilled in the art of semiconductor microelectronic fabrication. Because differing layers of thin film materials have different physical and thermal expansion properties, it is also well known that stress is inherently present in these multilayer film structures on a microelectronic chip. The amount of stress changes with temperature and as a function of lateral feature size/area across the chip. When stress anywhere within a patterned metal film feature becomes critically large (i.e., the “yield stress” is exceeded), the metal film can physically crack, buckle, or delaminate from other layers, which usually damages/fails the intended electrical operation of the microelectronic circuit.

Posted in: Briefs, Electronics & Computers


High-Temperature, Hydrophobic, Flexible Aerogel Composite and Method of Making Same

This technology is well suited for environments requiring insulation materials that can withstand temperatures of up to 1200 °C.NASA’s Glenn Research Center (GRC) has developed a method for fabricating low-density, flexible aerogel composites for use as thermal insulation for myriad applications. It is ideal for a variety of environments that require insulation materials that can withstand temperatures of up to 1200 °C. This innovation significantly advances the state of the art for composite insulation systems, reducing adherence problems and thermal conductivity limitations of conventional aerogel insulations while improving performance with lower weight, lower density, and higher efficiency, all factors contributing to greater applicability of aerogel insulation.

Posted in: Briefs, Materials


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