Partitioned Frequency-Division Multiplex for Bandwidth Compression

Spectrum would be utilized more efficiently than in CDMA and FDMA.

Three-Level Buck dc-to-dc Converter for Low Temperature

A dc-to-dc switching power converter of the three-level, pulse-width-modulated, buck type has been designed, built, and verified to operate at temperatures from ambient down to -196 °C...

High-Efficiency, Long-Life Pulsed Inductive Plasma Thrusters

Improved pulsed inductive plasma accelerators are undergoing development for use as long-life thrusters for propulsion of spacecraft on interplanetary missions and for maneuvering...

Micromachined Magnetostatic Switches

Magnetostatic switches — switches that open or close in response to magnetic fields — are being developed and fabricated using micromachining (MEMS) technology. These switches operate similarly to...

Switching Protocol for Optical Packet Data Communication

The figure illustrates aspects of a proposed switching protocol for optical packet data communication that would serve as an alternative to the older store-and-forward and header-first...

Automatic Thermal Switches With No Moving Parts

Quasi-thermostatic gas-gap thermal switches have been proposed. These switches would operate automatically, would contain no moving parts, would not require power supplies or controls, would...

Improved Two-Wavelength Focal-Plane Array of QWIPs

A focal-plane array (FPA) of GaAs-based quantum-well infrared photodetectors (QWIPs) that would detect images in two wavelength bands simultaneously is undergoing development. From ratios...

Variable-Wavelength Micromachined Fabry-Perot Interferometers

The figure schematically shows a micromachined Fabry-Perot interferometer that, when fully developed, would be part of a two-dimensional array of such interferometers in a...

Bounceless Switch/Monostable Multivibrator

A circuit has been designed to debounce a mechanical switch, which is used to activate a digital circuit. Contacts tend to make and break connections several times until the switch contacts settle...

Deployable and Restowable Protective Dome

Automated Cable-Analyzer System – ACAS

An instrumentation system automates the detection and location of faults in multiconductor electrical cables. It can accelerate diagnoses of aircraft, automotive, or industrial cables, while reducing...

Dual-Channel Precision Signal-to-Noise Ratio Generator

During the development and testing of signal processing systems, it is useful to generate test signals in the laboratory in order to quantify system parameters such as dynamic range,...

Antiovershoot Position Control for Motors Run at Full Speed

An improved motor controller provides a circuit that will allow a motor to run at full speed while traveling from point A to point B, and still be able to obtain the desired damping...

Automated Window Inspection Device

The Automated Window Inspection Device (AWID) is a prototype apparatus for computer-controlled, noncontact inspection of windows, with reproducible positioning and electronic recording of data on the...