Products: Photonics/Optics
Optical Flats

Optical Surfaces (Surrey, UK) offers standard and custom optical flats measuring up to 600 mm in diameter and manufactured of materials such as glass, Zerodur, and silica. The optical flats can be used for measuring surface...

Products: Photonics/Optics
CMOS Camera

Lumenera Corp. (Ottawa, ON, Canada) has introduced the Lw290, a USB 2.0 digital camera based on the company’s 1080P HD sensor. The 16:9 HD format, 2.0-megapixel CMOS sensor provides 20 frames per second at full 1920×1080 resolution. Higher frame rates are available at lower resolution, with full sub-window control and live...

Products: Photonics/Optics
Diode Laser Platform

Spectra-Physics, a Division of Newport Corp. (Tucson, AZ), has released a 900- to 980-nm diode laser platform based on epitaxial design. The diode laser platform provides CW power conversion efficiency to 71% for 940-nm single emitters (15°C case temperature). More than 68.5% peak PCE at 25°C may be achieved from...

A scheme is proposed for referencing the propagation direction of the transmit laser signal in pointing a free-space optical communications terminal. This recently...

Podcasts
Design Analysis in Product Innovation

Recorded August 17, 2006

Product innovation has recently come to the forefront as one of the truly sustainable competitive advantages a company can develop in the product development process. One common roadblock to the innovative process is the time and cost to prototype the endless variety of...

Figure 1 is a simplified schematic diagram of a system that automatically regulates the concentration of glucose or pH in a liquid culture medium that is circulated through a...

Briefs: Electronics & Computers
IMU/GPS System Provides Position and Attitude Data

A special navigation system is being developed to provide high-quality information on the position and attitude of a moving platform (an aircraft or spacecraft), for use in pointing and stabilization of a hyperspectral remote-sensing system carried aboard the platform. The system also serves to...

Figure 1 depicts a switching circuit that drives a piezoelectric pump at a high voltage with a polarity that alternates at the desired mechanical pump frequency. This circuit offers...

Briefs: Electronics & Computers
Developing Signal Pattern Recognition Programs

Pattern Interpretation and Recognition Application Toolkit Environment (PIRATE) is a block-oriented software system that aids the development of application programs that analyze signals in real time in order to recognize signal patterns that are indicative of conditions or events of interest....

The Planetary Autonomous Amphibious Robotic Vehicle (PAARV), now at the prototype stage of development, was originally intended for use in acquiring and analyzing samples of solid,...

Briefs: Mechanical & Fluid Systems
System Would Acquire Core and Powder Samples of Rocks

A system for automated sampling of rocks, ice, and similar hard materials at and immediately below the surface of the ground is undergoing development. The system, denoted a sample...

Briefs: Mechanical & Fluid Systems
Producing Quantum Dots by Spray Pyrolysis

An improved process for making nanocrystallites, commonly denoted quantum dots (QDs), is based on spray pyrolysis. Unlike the process used heretofore, the improved process is amenable to mass...

An improved method has been devised for fabricating micron-dimension Li features. This approach is intended for application in the fabrication of lithium-based microelectrochemical...

Briefs: Manufacturing & Prototyping
Manufacture of Regularly Shaped Sol-Gel Pellets

An extrusion batch process for manufacturing regularly shaped sol-gel pellets has been devised as an improved alternative to a spray process that yields irregularly shaped pellets. The aspect ratio of regularly shaped pellets can be controlled more easily, while regularly shaped pellets pack more...

An algorithm that effects fast lossless compression of multispectral-image data is based on low-complexity, proven adaptive filtering algorithms. This algorithm is intended for use in...

Briefs: Information Technology
Improved Solar-Radiation-Pressure Models for GPS Satellites

A report describes a series of computational models conceived as an improvement over prior models for determining effects of solar-radiation pressure on orbits of Global Positioning System (GPS) satellites. These models are based on fitting coefficients of Fourier functions of...

Briefs: Information Technology
Algorithms for Maneuvering Spacecraft Around Small Bodies

A document describes mathematical derivations and applications of autonomous guidance algorithms for maneuvering spacecraft in the vicinities of small astronomical bodies like comets or asteroids. These algorithms compute fuel- or energy-optimal trajectories for typical maneuvers by...

Practical Simulator Network (PSimNet) is a set of data communication protocols designed especially for use in handling messages between computers that are engaging cooperatively in...

Briefs: Information Technology
Statistical Detection of Atypical Aircraft Flights

A computational method and software to implement the method have been developed to sift through vast quantities of digital flight data to alert human analysts to aircraft flights that are statistically atypical in ways that signify that safety may be adversely affected. On a typical day, there...

Briefs: Information Technology
Developing Signal-Pattern-Recognition Programs

An automated system to assist a General Aviation (GA) pilot in improving situational awareness of weather in flight is now undergoing development. This development is prompted by the observation...

Briefs: Information Technology
NASA's Aviation Safety and Modeling Project

The Aviation Safety Monitoring and Modeling (ASMM) Project of NASA’s Aviation Safety program is cultivating sources of data and developing automated computer hardware and software to facilitate...

A process for fabricating thermoelectric modules with vacuum gaps separating the thermoelectric legs has been conceived, and the feasibility of some essential parts of the process...

The cryospheric advanced sensor (CAS) is a developmental airborne (and, potentially, spaceborne) radar based instrumentation system for measuring and mapping the thickness of sea ice....

Briefs: Physical Sciences
Measuring Attitude of a Large, Flexible, Orbiting Structure

A document summarizes a proposed metrology subsystem for precisely measuring the attitude of a large and flexible structure in space.

A proposed remote-sensing instrument, to be carried aboard a spacecraft in orbit around the Earth, would gather data on the spatial distribution and radiative characteristics of...

Briefs: Physical Sciences
Multimode-Guided-Wave Ultrasonic Scanning of Materials

Two documents discuss a method of characterizing advanced composite materials by use of multimode-guided ultrasonic waves. The method at an earlier stage of development was described in “High-Performance Scanning Acousto-Ultrasonic System” (LEW-17601-1), NASA Tech Briefs, Vol. 30, No. 3...

Briefs: Physical Sciences
Microscale Regenerative Heat Exchanger

The device illustrated in Figure 1 is designed primarily for use as a regenerative heat exchanger in a miniature Stirling engine or Stirling-cycle heat pump. A regenerative heat exchanger (sometimes...

Accelerometers used for shock and vibration measurement in extreme environments require special consideration in the design and manufacturing process. Certain...

A three-stage monolithic microwave integrated circuit (MMIC) W-band amplifier has been constructed and tested in a continuing effort to develop amplifiers as well as oscillators,...

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