Raytheon

About: Raytheon is a company organization based out in Waltham, Massachusetts, United States. It is known for research contribution in the topics: Signal & Antenna (radio). The organization has 15290 authors who have published 18973 publications receiving 300052 citations.

Architecture and method of coupling electromagnetic energy to thermal detectors

Abstract: A radiation sensor. The inventive sensor has a two-level detector structure formed on a substrate in which a thermal detector element is suspended over the substrate as a microbridge structure. A receiver of electromagnetic radiation is provided on the same side of the substrate in a manner that efficiently couples the radiation field to the thermal detector element. The thermal detector element has a sandwich structure including a heater metal layer, a dielectric layer, and a thin film thermo-resistive material. The thermal detector element is suspended out of physical contact with the receiver. In one embodiment, the receiver is an antenna having a crossed bowtie configuration that efficiently couples the radiation field to the detector element. The inventive radiation sensors are especially useful for mm-wave and microwave sensing applications. The sensor can be used individually or in linear or two-dimensional arrays thereof. The invention also is directed to a method of fabricating such a radiation sensor.

Catoptric lens arrangement

Abstract: Improved catoptric lens arrangements are shown wherein a beam may be formed from light emitted by a plurality of sources of light, the intensity and direction of such beam being automatically controlled in response to the speed and direction of travel of a motor vehicle carrying such arrangements.

Fiber optic beam delivery system for high-power laser

Abstract: A system is provided for delivering a high-power laser beam through a fiber optic cable to a metal workpiece for drilling, cutting or welding the workpiece. The laser beam is focused onto a first end of the fiber optic cable, with a gas being applied to the first end of the cable as a cooling agent. The gas is transmitted coaxially with the fiber optic cable along the length thereof. The laser beam emerges from a second end of the fiber optic cable and is received and focused onto a workpiece by a beam delivery assembly. The transmitted gas is applied to the second end of the fiber optic cable as a cooling agent and injected onto the workpiece coaxially with the focused laser beam. With such arrangement, a laser beam is delivered to a workpiece for processing the workpiece via a flexible system, allowing the beam to be dexterously maneuvered about the workpiece. Also, since the gas cooling agent is applied to the workpiece coaxially with the focused beam, the gas may comprise an element which assists the laser beam in processing the workpiece. Also included is a mechanism for facilitating connection of the beam delivery assembly to an arm for maneuvering the beam delivery assembly through a plurality of positions with respect to the workpiece. Such mechanism inhibits rotation of the beam delivery assembly and the fiber optic cable during such maneuvering, thus preventing rotational strain from being applied to the cable and reducing the possibility of cable breakage.

Optical magnetron generator

Abstract: An optical magnetron generator is provided which includes an anode and a collector separated by an anode-collector space, a pair of output terminals operatively coupled to the anode and the collector to provide an electrical power output based on an electric field generated across the anode-collector space. The optical magnetron generator further includes one magnet arranged to provide a dc magnetic field within the anode-collector space generally normal to the electric field, and a plurality or resonant cavities each having an opening along a surface of the anode which defines the anode-collector space; an input for receiving electromagnetic radiation from an external source and operatively configured to introduce the optical radiation into the anode-cathode space to establish a resonance electromagnetic field within the resonance cavities. A cathode for introducing electrons into the anode-collector space in proximity to the resonant electromagnetic filed, wherein the resonant electromagnetic field accelerates the electrons within the anode-collector space towards the collector onto which at least one portion of the electrons are collected.

The relativistic redshift with 3×10−17 uncertainty at NIST, Boulder, Colorado, USA

Abstract: We have estimated the relativistic redshift correction due to gravity, necessary to reference to the geoid the measurements of the new frequency standards at the National Institute of Standards and Technology (NIST) in Boulder, Colorado, USA, using a new local survey and various methods and models. We referenced the frequency offsets computed from different methods to the same geoid surface, one defined with respect to the current best estimate of an ideal mean-Earth ellipsoid. The new fractional frequency results are (1) −1797.61×10−16, based on the global gravitational model EGM96; (2a) −1798.72×10−16, based on the regional, high-resolution geoid model G96SSS; (2b) −1798.49×10−16, based on the regional, high-resolution geoid model G99SSS; and (3) −1798.91×10−16, based on the value for the geopotential number provided in the National Geodetic Survey's data sheet for the NIST reference marker. The minus sign implies that clocks run faster in the laboratory in Boulder than a standard clock located on the geoid. The values from (2b) and (3) are expected to be the most accurate and are also independent. Based on these results, we estimate the frequency shift at the reference point at NIST to be −1798.7×10−16, with an estimated standard uncertainty of ±0.3×10−16.