Topics

Physical Sciences

Articles : Photonics/Optics
Monolithic Dual Telescope for Compact Biaxial Lidar

A document discusses the Ultra Compact Cloud Physics Lidar, a biaxial lidar with a narrow receiver field of view. It requires tight optical alignment between the transmitter and receiver paths while flying on various aircraft over various temperatures and in the presence of vibration. To...

Briefs : Physical Sciences
Ultra-Low-Maintenance Portable Ocean Power Station

The goals of this research are to develop a relatively inexpensive, compact, and modular power package for deep offshore oil drilling or other undersea applications that provides 2 to 5 MW electricity, minimal maintenance, and at least 30 years of life.

Briefs : Physical Sciences
Mars-Optimized Solar Cells

Commercial triple junction solar cell designs were modified in their junction thicknesses, contact grid densities, and anti-reflective (AR) coating thicknesses to better match the Mars surface solar spectrum. Resulting cells show up to approximately 8% relative improvement in efficiency under the Mars solar spectrum,...

Briefs : Physical Sciences
Alternating Magnetic Field Forces for Satellite Formation Flying

Orbiting a large number of satellites in fixed formations will be critical to many future space missions, especially large-scale interferometers, telescopes, antennas, and gravity wave detectors. Consequently, extensive research has been devoted over the last 20 years to formation...

Articles : Physical Sciences
Thermal Materials Protect Priceless Personal Keepsakes

Most of us cannot comprehend the task of building something to withstand temperatures over 4,000 °F, but NASA can. The space shuttles endured such temperatures when returning to Earth’s atmosphere because of aerodynamic heating, or heating due to the combination of compression and surface...

Briefs : Sensors/Data Acquisition
Nanosensor/Cellphone Hybrid for Detecting Chemicals and Concentrations

Nanosensors have been developed for chemical detection using carbon nanotubes (CNTs). Unlike other chemical sensors, this solid-state approach requires no reagents and can be refreshed with a solid-state ultraviolet (UV) diode. The sensors possess high sensitivity (ppbv),...

Briefs : Sensors/Data Acquisition
Coated or Doped Carbon Nanotube Network Sensors as Affected by Environmental Parameters

Chemical sensors have been developed over the past decades to detect gases and vapors at various concentration levels for deployment in a wide range of industrial applications. The detection usually centers on a change of a particular property or status of...

Briefs : Physical Sciences
Regenerable Internal CO Scrubber for Hydrogen Sensors

Amperometric electrochemical sensors are commonly used for the detection of carbon monoxide (CO) and hydrogen (H2) in air. The electrochemistry of heterogeneous CO and H2 oxidations is similar enough that the sensors show significant cross-sensitivities between the two...

Briefs : Physical Sciences
Nanostructure Sensor Determines Presence and Concentration of a Target Molecule in Fluid

Several methods are presently being developed to sense the presence of a target molecule in small or modest concentration in a fluid. However, estimation of the concentration of the target molecule is unavailable where the fluid is substantially motionless...

Briefs : Physical Sciences
Floating Ultrasonic Transducer Inspection System for Nondestructive Evaluation

This floating ultrasonic transducer inspection system is based on a “momentary touching” scheme wherein the ultrasonic transducer is in contact with the structure being scanned for a relatively short time while performing the measurement. A vibrating element is a...

Briefs : Physical Sciences
Multiplexer for Multiple Sensors in a Vacuum Chamber

Vacuum chamber testing at large facilities can require hundreds of instruments, necessitating even more feedthroughs. The number of instruments and sensors that can be fed into a vacuum chamber is limited by the number of feedthrough ports dedicated to instrumentation. Thus high-pin-count,...

Briefs : Sensors/Data Acquisition
Miniaturized Schottky Diode Sensors for Hydrogen and Hydrocarbon Detection at High Temperatures

A miniaturized Schottky diode hydrogen and hydrocarbon sensor with the structure of catalytic metal-metal oxide-silicon carbide (SiC) has been developed. The major innovation of this work is the use of the metal oxide, palladium oxide...

Briefs : Sensors/Data Acquisition
Analog Ceramic Isolated Voltage Sensor

Galvanic isolated monitoring of voltages for launch vehicle, missiles, and space-deployed systems can be very challenging. Radiation exposure makes use of optics-based sensors difficult, as they can latch-up and become corrupted by the radiation environment; such devices can moreover be thermally...

Briefs : Physical Sciences
Flexible and Erectable Magnetic Field Response Sensors

The means to make a flexible and/or erectable magnetic field response sensor, a geometrically fixed capacitor mounting frame, a wireless dipstick, and an elastically flexible capacitor support have been developed. Either the capacitor mounting frame or the flexible, erectable magnetic field...

Briefs : Sensors/Data Acquisition
Miniature Amperometric Solid Electrolyte Carbon Dioxide Sensor with Low Detection Limit

A miniaturized amperometric electro-chemical (solid electrolyte) carbon dioxide (CO2) sensor using a novel and robust sensor design has been developed and demonstrated. Semiconductor microfabrication techniques were used in the sensor fabrication,...