Keyword: Optics

Briefs: Photonics/Optics

A scanning optoelectronic instrument generates the digital equivalent of a three-dimensional (X,Y,Z) map of a surface that spans an area with resolution on the order of 0.005 in....

Briefs: Photonics/Optics

The Matrix Assisted Laser Desorption and Ionization (MALDI) technique in 1987 led to a renewed interest for the nitrogen laser. MALDI allows large and fragile biomolecules to be desorbed and...

Briefs: Photonics/Optics

An electro-optical (E-O) imaging Fourier-transform spectrometer (IFTS), now under development, is a prototype of improved imaging spectrometers to be used for hyperspectral imaging,...

Who's Who: Aerospace

Before becoming NASA Ames Research Center Director, Dr. Worden was a Research Professor of Astronomy, Optical Sciences, and Planetary Sciences at the...

Briefs: Medical
Instrument Would Detect and Collect Biological Aerosols

A proposed compact, portable instrument would sample micron-sized airborne particles, would discriminate between biological ones (e.g., bacteria) and nonbiological ones (e.g., dust particles), and would collect the detected biological particles for further analysis. The instrument is...

Application Briefs: Imaging

Laser Camera System (LCS)
Neptec Design Group
Houston, TX
281-280-8555
www.neptec.com
Briefs: Electronics & Computers

The NASA Ames hyperwall is a display system designed to facilitate the visualization of sets of multivariate and multidimensional data like those generated in complex engineering and...

Briefs: Photonics/Optics

A control system strives to maintain the correct alignment of a laser beam in an interferometer dedicated to measuring the displacement or distance between two fiducial corner-cube...

Briefs: Electronics & Computers

A three-dimensional (3D) x-ray luggage- screening system has been proposed to reduce the fatigue experienced by human inspectors and increase their ability to detect weapons and other contraband. The system...

Briefs: Electronics & Computers
Photodetector Arrays for Multicolor Visible/Infrared Imaging

Monolithic focal-plane arrays of photodetectors capable of imaging the same scenes simultaneously in multiple wavelength bands in the visible and infrared spectral regions have been proposed. In prior visible/infrared imaging systems, it has been standard practice to use separate...

Briefs: Manufacturing & Prototyping
An improved method has been devised for using directed, hyperthermal beams of oxygen atoms and ions to impart desired textures to the tips of polymethylmethacrylate [PMMA] optical...
Briefs: Materials
Thermoelectric Inhomogeneities in (Ag₁₋ᵧSbTe₂)ₓ(PbTe)₁₋ₓ

A document presents a study of why materials of composition (Ag1–ySbTe2)0.05 (PbTe)0.95 [0≤y≤1] were previously reported to have values of the thermoelectric figure of merit [ZT (where Z =α2/ρκ, α is the...

Briefs: Mechanical & Fluid Systems
Tool for Torquing Circular Electrical-Connector Collars

An improved tool has been devised for applying torque to lock and unlock knurled collars on circular electrical connectors. The tool was originally designed for, and used by, astronauts working in outer space on the Hubble Space Telescope (HST). The tool is readily adaptable to terrestrial...

Briefs: Physical Sciences
Phase Sensor for Aligning a Segmented Telescope Mirror

A phase sensor has been developed for use in aligning a segmented telescope mirror to within a fraction of a wavelength in piston. (As used here, "piston" signifies displacement of a mirror segment along the optical axis of the telescope.) Such precise alignment is necessary in order to...

Briefs: Physical Sciences

A recently proposed boundary condition for atomistic computational modeling of semiconductor nanostructures (particularly, quantum dots) is an improved alternative to two prior...

Briefs: Physical Sciences

Prototype transducers based on integrated optical ring resonators have been demonstrated to be useful for detecting the protein avidin in extremely dilute solutions. In an experiment, one of...

Briefs: Software
Control Software for Advanced Video Guidance Sensor

Embedded software has been developed specifically for controlling an Advanced Video Guidance Sensor (AVGS). [As described in several previous NASA Tech Briefs articles, a Video Guidance Sensor is an optoelectronic system that provides guidance for automated docking of two vehicles (space-craft...

Briefs: Software
Earth Observing System Data Gateway

The Earth Observing System Data Gateway (EDG) software provides a "one-stop-shopping" standard interface for exploring and ordering Earth-science data stored at geographically distributed sites. EDG enables a user to do the following:

Articles: Photonics/Optics

High-resolution digital imaging, low-light-level biomedical devices, and automotive sensing are just a few of today’s hot technologies demanding both low-cost and high-performance...

Briefs: Photonics/Optics

RedShift Systems, Waltham, Massachusetts

The desire to “see” in complete darkness or through obscurants such as smoke or fog has driven the development and adoption of thermal...

Briefs: Photonics/Optics

Optically driven deformable mirrors may eventually supplant electrically driven deformable mirrors in some adaptive-optics and active-optics applications. Traditionally, the mirror facets in electrically...

Briefs: Photonics/Optics

A method of equipping fiber-optic-coupled laser diodes to evenly illuminate specified fields of view has been proposed. The essence of the method is to shape the tips of the optical...

Briefs: Photonics/Optics

Coherent, Santa Clara, California

Ultraviolet lasers currently are used in a very diverse range of industries and applications. This is because their high-energy photons directly...

Briefs: Electronics & Computers

A proposed free-space optical communication system would operate in a full-duplex mode, using a single constant-power laser beam for transmission and reception of binary signals at...

Briefs: Electronics & Computers

Optical oscillators that exploit resonantly enhanced four-wave mixing in nonlinear whispering- gallery- mode (WGM) resonators are under investigation for potential utility as...

Briefs: Electronics & Computers

A scheme for stabilizing the frequency of a microwave signal is proposed that exploits the operational characteristics of a coupled optoelectronic oscillator (COEO) and related...

Briefs: Information Technology

The spatial standard observer is a computational model that provides a measure of the visibility of a target in a uniform background image or of the visual discriminability of two images. Standard observers have...

Briefs: RF & Microwave Electronics
Assistant for Analyzing Tropical Rain Mapping Radar Data

TDS is composed of software and hardware elements incorporating a two-frequency spaceborne radar system for measuring tropical precipitation. The TDS would be used primarily in generating data products for scientific investigations. The most novel part of the TDS would be expert-system...

Briefs: Physical Sciences

An electronic absolute Cartesian autocollimator performs the same basic optical function as does a conventional all-optical or a conventional electronic autocollimator but differs in the nature of...