Keyword: Radiation

Briefs: Electronics & Computers

A small, segmented microstrip patch antenna integrated with an X-band feedback oscillator on a high- permittivity substrate has been built and tested (see Figure 1). The oscillator antenna is powered by...

Briefs: Semiconductors & ICs

Three-stage monolithic millimeter-wave integrated-circuit (MMIC) amplifiers capable of providing useful amounts of gain over the frequency range from 120 to 180 GHz have been developed as...

Briefs: Semiconductors & ICs

Closely following the development reported in the article, "Low-Noise MMIC Amplifiers for 120 to 180 GHz" (NPO-42783), three new monolithic microwave integrated circuit (MMIC)...

Briefs: Physical Sciences

Systematic studies have been performed on the sensitivity of GaN HEMT (high electron mobility transistor) sensors using various gate electrode designs and operational parameters. The results here...

Briefs: Physical Sciences

Lightweight cylindrical reflectors of a proposed type would be made from reflective membranes stretched between pairs of identically curved and identically oriented end rails. In each...

Briefs: Imaging

An apparatus for mid-infrared reflectance imaging has been developed as means of inspecting for subsurface damage in thermal-barrier coatings (TBCs). The apparatus is designed,...

Application Briefs: Green Design & Manufacturing
Micro-Molded IMLI Matrix part
Phillips Plastics Corp.
Prescott, WI
877-508-0252
phillipsplastics.com

To achieve a high level of energy density...

Briefs: Software
FPGA Boot Loader and Scrubber

A computer program loads configuration code into a Xilinx field-programmable gate array (FPGA), reads back and verifies that code, reloads the code if an error is detected, and monitors the performance of the FPGA for errors in the presence of radiation. The program consists mainly of a set of VHDL files (wherein...

Briefs: Software

A method of automated detection of negative obstacles (potholes, ditches, and the like) ahead of ground vehicles at night involves processing of imagery from thermal-infrared cameras...

Articles: Imaging

Infrared (IR) thermography is an indispensable tool for studying dynamic thermal phenomena. This type of imaging is accomplished with an IR camera (Figure 1) that converts infrared...

Articles: Photonics/Optics

Heat transfer is governed by three distinct mechanisms: convection, conduction, and radiation. Unlike convection or conduction, heat transfer through radiation does not occur...

Briefs: Electronics & Computers

A proposed heterodyne receiver would be capable of detecting electromagnetic radiation in both of two orthogonal linear polarizations, separating sidebands, and providing...

Application Briefs: Sensors/Data Acquisition
CCD Imaging Sensors Aid Hubble in Exploring the Universe
Charge coupled device (CCD) imaging sensors
e2v
Chelmsford, UK
44 (0)1245 493493
www.e2v.com

e2v CCD imaging sensors were launched recently on the Space Shuttle Atlantis as part of a mission to upgrade and repair the Hubble Space Telescope. The imaging sensors...

Articles: Energy

Light emitting diodes (LEDs) and solid state lighting (SSL) products that incorporate LEDs pose many measurement challenges compared with other lighting elements, such as traditional...

Briefs: Manufacturing & Prototyping
Improved Blackbody Temperature Sensors for a Vacuum Furnace

Some improvements have been made in the design and fabrication of blackbody sensors (BBSs) used to measure the temperature of a heater core in a vacuum furnace. Each BBS consists of a ring of thermally conductive, high-melting-temperature material with two tantalum-sheathed...

Briefs: Electronics & Computers

A superconducting hot-electron bolometer has been built and tested as a prototype of high-sensitivity, rapid-response detectors of submillimeter-wavelength radiation. There are diverse...

Briefs: Electronics & Computers
Improved-Bandwidth Transimpedance Amplifier

The widest available operational amplifier, with the best voltage and current noise characteristics, is considered for transimpedance amplifier (TIA) applications where wide bandwidth is required to handle fast rising input signals (as for time-of-flight measurement cases). The added amplifier inside...

Briefs: Physical Sciences

An alignment jig (see figure) places a THz horn and power detector at the proper locations with respect to the focal points of a conic reflector in order to couple total power of the...

Briefs: Physical Sciences

This compact, lightweight, dual- frequency antenna feed developed for future soil moisture and sea surface salinity (SSS) missions can benefit future soil and...

Briefs: Electronics & Computers

The figure shows a dual-beam, dual- polarization Ku-band antenna, the reflector of which comprises an assembly of small reflectarrays arranged in a piecewise-planar approximation of a parabolic...

Briefs: Manufacturing & Prototyping

A development effort was directed toward formulating epoxy resins that are useful both as structural materials and as shielding against heavy-ion radiation. Hydrogen is recognized as the best element...

Briefs: Materials

Integrated multilayer insulation (IMLI) is being developed as an improved alternative to conventional multilayer insulation (MLI), which is more than 50 years old. A typical conventional MLI blanket comprises...

Articles: Medical

Kristina Irsch Wilmer Ophthalmological Institute, Johns Hopkins University
School of Medicine
Baltimore, MD

Amblyopia, commonly known as “lazy eye,” is the leading cause of vision loss in...

Who's Who: Aerospace

Dr. Alexander Kashlinsky is a principal investigator on several NASA and NSF grants studying topics related to cosmological bulk flows, cosmic...

Briefs: Electronics & Computers

An effort to develop large-aperture, wide-angle-scanning reflectarray antennas for microwave radar and communication systems is underway. In an antenna of this type as envisioned,...

Application Briefs: Electronics & Computers
Radiation Detection Hardware Part of Living With a Star Experiment
Space dosimeter card
Space Micro Inc.
San Diego, CA
858-332-0700
www.spacemicro.com

Space Micro’s space dosimeter card has been successfully integrated at NASA Goddard Space Flight Center (Greenbelt, MD) into the Living with a Star (LWS), Space...

Briefs: Electronics & Computers

The frequency-multiplier submillimeter spectrometer (FMSS) is a laboratory apparatus for far-infrared molecular spectroscopy, embodying several advances over prior such apparatuses. The...

Application Briefs: Photonics/Optics

Light emitting diodes (LEDs) and solid state lighting (SSL) products that incorporate LEDs pose many measurement challenges compared with other lighting elements, such as traditional...

Briefs: Semiconductors & ICs

Prototype logic gates made of n-channel junction field-effect transistors (JFETs) and epitaxial resistors have been demonstrated, with a view toward eventual implementation of...