| Patent Number |
Title Of Patent |
Date Issued |
| 6249536 |
Lasers |
June 19, 2001 |
| The array is highly suitable for producing a spacially wide output "beam" (comprising a number of individual beams). It suffers less from problems of hotspots and filamentation since each tapered laser supports a limited number of modes, or even a single mode. Therefore it produces a |
| 6184757 |
Cryogenic electronic assembly |
February 6, 2001 |
| A number of electronic modules 82, 82', 83, 83' are mounted on a cold finger 100 disposed within a sealed housing 104, 110, the interior 210 of which is evacuated. To minimize heat transfer by conduction, gaps are provided in the dielectric substrates carrying the input and output tr |
| 6154910 |
Bridge stabilization |
December 5, 2000 |
| A bridge deck (10) is supported by tensile supports (11 and 12) and stabilized to reduce the overall aerodynamic lift on the deck (10) by the addition of aerofoil stabilizers (19 and 20) pivotally secured about respective axes (21) generally longitudinal of the deck (10). The stabili |
| 6130636 |
Continuous wave radar system |
October 10, 2000 |
| A continuous wave radar system, for example a radar altimeter, comprises a memory (24) for storing an array of return signals, means for performing a time integration (25) of the array to improve its signal-to-noise ratio, means responsive to the time integrated array (26) to compare (30 |
| 6058847 |
Submersible mine neutralisation vehicle |
May 9, 2000 |
| A mine neutralisation vehicle comprises a first portion to which propulsion units are attached by which propulsion units the vehicle is positioned. Pivotally connected to the first section is a second section containing a shaped charge warhead. By means of the pivot connection the shaped |
| 6055634 |
Secure internal communication system |
April 25, 2000 |
| A communications system includes a plurality of interfaces (20) each of which can receive and/or transmit data to a common transmission network (21). Each interface (20) transmitting data to the network (21) attaches a classification code to the transmitted data, and each interface (20) |
| 5926759 |
Telecommunications system |
July 20, 1999 |
| The invention provides a system and method whereby a mobile station of telecommunications system selects one of a number of fixed ground stations by which the mobile station communicates with the public switched telephone network or other such system, selection being made by the mobile |
| 5898401 |
Continuous wave radar altimeter |
April 27, 1999 |
| A continuous wave radar altimeter comprises a pulsed power control (4), operable when the signal-to-noise ratio of the received signal is likely to be too low, to pulse the transmitted power so that the power varies between a non-zero base level and a higher level. The receiver channel |
| 5864307 |
Aircraft terrain advisory system |
January 26, 1999 |
| A terrain advisory system for an aircraft (A) comprises a processor (11) which compares terrain information, accessed from a memory (13) according to data from a navigation system (12), with dynamic flight parameters from a monitor (14) for the aircraft. The processor (11) also generates |
| 5864135 |
Thermal imager referencing system |
January 26, 1999 |
| A thermal imager referencing system comprises two rotating cranks in the form of discs (7, 8) each pivotally attached to connecting member (9). The discs (7, 8) are rotated at a constant speed causing two mirrors laterally displaced along connecting member (9) to intercept an optical pat |
| 5860477 |
Underwater oil field apparatus |
January 19, 1999 |
| A latching mechanism for a sub-sea control module is constructed with energy storing means such that a latch is cooked into an unlatched condition by the action of lifting the sub-sea control module to store energy in the energy storing means and is moved into a latched condition by |
| 5838802 |
Apparatus for cancelling vibrations |
November 17, 1998 |
| An apparatus for cancelling vibrations includes a reference signal representative of the vibrations to be cancelled, an adaptive control filter producing an output signal based on the reference signal, and an actuator responsive to the output signal to produce vibrations which destru |
| 5821544 |
Electron microscope specimen supports |
October 13, 1998 |
| A specimen support for use in an electron microscope comprises a deposited diamond film. The film is deposited on a substrate using a plasma assisted chemical vapor deposition process and then machined to a desired configuration using a laser machining process. Molybdenum, tungsten or |
| 5781148 |
Continuous wave radar altimeter |
July 14, 1998 |
| A continuous wave radar altimeter comprises a memory (24, 26), means for storing in the memory in digital form an array of return signals representative of the variation of reflected amplitude with path length, means (27), for addressing the memory for identifying a peak return repre |
| 5731782 |
Ranging systems |
March 24, 1998 |
| A continuous wave ranging system comprises a modulator for modulating an r.f. carrier signal in accordance with a pseudo random code, a transmitting antenna for radiating the signal towards a target, a receiving antenna and receiver for detecting the signal reflected from the target, |
| 5723304 |
Immunological detection using two detectable labels |
March 3, 1998 |
| The invention relates to a method of detection, a sensor and a test-kit which find application in immunological detection (e.g., immunoassay). The invention provides, inter alia, a method of detection, suitable for use in immunological detection of an entity, which method includes the us |
| 5668552 |
Analogue-to-digital converters |
September 16, 1997 |
| An analog-to-digital converter includes an input for analog signals, a quantizer for producing a digital signal output, a feedback loop for feeding a signal derived from the digital output to be combined in analog form with the analog input for input to a filter. The output of the filter |
| 5647954 |
Manufacture of etched substrates such as infrared detectors |
July 15, 1997 |
| A narrow and deep aperture is chemically etched in or through a body of, for example, cadmium mercury telluride or other infrared sensitive material. The etchant is constrained and etches faster adjacent to side walls of a mask on the body. Those side walls are sufficiently close to |
| 5646784 |
Helmet display system |
July 8, 1997 |
| A helmet display system is provided comprising a display visor 3 located on helmet 1 on which helmet is also positioned image projection means for projecting an image via a holographic combiner 4 on the display visor 3. The helmet further comprises an anti-glare visor 2 which has optical |
| 5592296 |
Exhaust gas particle sensor |
January 7, 1997 |
| In a exhaust smoke sensor a light emitter generates a light beam which passes through a region containing the exhaust gas to a first light sensor. To reduce interference the light emitter is driven by a near square wave signal produced by passing a square wave through a low pass filt |
| 5510890 |
Laser radar with reference beam storage |
April 23, 1996 |
| In a laser radar system, in which pulses from a laser are focused by a telescope onto a target, the back-scattered radiation being deflected by polarizing beam splitter onto a detector in conjunction with a reference beam, the reference beam being produced from pulses derived from the pu |
| 5483683 |
Changeover means for r.f. source |
January 9, 1996 |
| A changeover device provides for contactless interchange of power between an r.f. source such as a transmitter Tx.sub.1 and two loads, such as an aerial 2 and a test load 3. The device may be used in a changeover system for exchanging main and standby transmitters in the event of failure |
| 5481868 |
Variable area nozzle with fixed convergent-divergent walls and relatively movable parallel sidep |
January 9, 1996 |
| A variable area convergent-divergent nozzle for use as an attitude control thruster on a VTOL aircraft is formed by a curved wall forming a chamber a convergent section a throat section and a divergent section and a pair of parallel side plates, one of the side plates being movable to al |
| 5479281 |
Display devices |
December 26, 1995 |
| A reflective liquid crystal display device includes a ferroelectric liquid crystal cell, a first polarizer through which light from a light source passes before passing through the cell, a second polarizer through which the light passes after passing through the cell, and a reflective la |
| 5438693 |
R. F. mixer |
August 1, 1995 |
| A mixer of the commutating type using FETs to switch between the primary of a transformer for an r.f. input and the secondary of a transformer 2 for an i.f. output. The mixer has high linearity and low power consumption of the local oscillator drive because the gate electrodes of the FET |
| 5428701 |
Electro-optical tunable filter |
June 27, 1995 |
| An optical filter comprises a light waveguide and an electrode structure located adjacent the waveguide. The electrode structure comprises a first ladder arrangement having a plurality of rungs disposed along the length of the waveguide and spaced apart from each other, each rung of the |
| 5412254 |
High voltage pulse generator |
May 2, 1995 |
| A high voltage pulse generator for providing a high voltage pulse across a dielectric switch comprises a main high voltage pulse generator, an energy storing pulse forming line connected at one end to the main pulse generator and connected at the other end to an electrode of the dielectr |
| 5391873 |
Imaging apparatus compensating for nonuniformity in detector outputs |
February 21, 1995 |
| This invention provides imaging apparatus in which an image is scanned over an array of sensing elements 2, the outputs of which form a plurality of channels. Signal processing means 6 adds a noise signal to at least some of the channels to more closely match the signal to noise ratio of |
| 5389890 |
Combiners for R.F. power amplifiers |
February 14, 1995 |
| Directional couplers 7.sup.1 -7.sup.20 are used to couple power from r.f. power amplifier modules 5.sup.1 -5.sup.20 to a transmission line 6 or other type of resonator, from which it is withdrawn by directional coupler 8. The power withdrawn from the continuous transmission line, which i |
| 5389883 |
Measurement of gas and water content in oil |
February 14, 1995 |
| In order to measure the relative proportions of oil, water and gas passing along a pipe, the pipe is passed through the coils of a number of coil resonators having different resonant frequencies. By measuring changes in the resonant frequencies of the coil resonators the proportions of o |
| 5376804 |
Optical analysis system and positioning apparatus thereof |
December 27, 1994 |
| An optical analysis or processing system for use, for example, in the analysis of microscopic spots of material by their effect on a very fine polarized beam of light (e.g., FPIA). For multiple "spot" analysis the spot samples are disposed on a substrate in predetermined relation with an |
| 5374992 |
Exhaust gas particle sensor |
December 20, 1994 |
| An exhaust gas particle sensor has an inlet tube and a sensing region having different cross sections and linked by a transition region including a number of baffles arranged so that the time taken for gas to travel from the inlet tube to the sensing region is substantially independe |
| 5367340 |
Apparatus and method for noise reduction of video signal dependent upon video gain |
November 22, 1994 |
| A circuit 8 reduces noise on a video signal from an imager 6 for a TV monitor 7. The noise reduction circuit includes a video frame store connected so as to integrate the corresponding picture elements of several frames in order to reduce noise. The amount of noise reduction applied |
| 5353109 |
Receiver-transmitter for a target identification system |
October 4, 1994 |
| A receiver-transmitter for a target identification system having a particular but not necessarily an exclusive application for the identification of aircraft which utilizes laser vibrometry and a coherent array receiver including an array of photodetectors adapted to receive signals |
| 5351521 |
Measurement of gas and water content in oil |
October 4, 1994 |
| A device for measuring the relative proportions of gas, oil and water in a conductive pipe includes at least one open-ended, conductive tube having a radius different from the pipe, disposed within the pipe. Microwave transmission structure transmits microwave signals along the pipe and |
| 5343202 |
Radar reflector |
August 30, 1994 |
| Radar reflector structure is disclosed including a plurality of reflector elements which in use are arranged in a non-planar configuration, the reflector elements include a thin flexible member extending between adjacent reflector elements substantially at or below the surface of the |
| 5341140 |
Transponder system |
August 23, 1994 |
| A transponder system comprising an interrogating source of HF electromagnetic radiation, and a plurality of transponders which each include a token reader unit to receive a removable token, e.g., a smart card, including onboard data processing capability. The transponders, or a group |
| 5341135 |
Analogue-to-digital converters, digital-to-analogue converters, and digital modulators |
August 23, 1994 |
| An analog-to-digital converter includes a filter having an input for receiving, via a summing node, a signal derived from the analog input signal. A first quantizer produces a first digital signal from a signal derived from the output of the filter. A feedback loop feeds a signal der |
| 5318949 |
Superconducting ceramic composition comprising (Pb,Cd)-Sr-(Y,Q)-Cu-O wherein Q is Ca or Sr |
June 7, 1994 |
| A superconducting ceramic composition which is free of thallium, the composition having a unit cell containing two perovskite structure copper-oxygen planes and a rocksalt structure layer having a single plane containing cadmium. |
| 5293168 |
Radar apparatus and method |
March 8, 1994 |
| The invention provides a method of determining the range of a radar signal reflecting object by utilizing a radar frequency carrier wave modulated by a first short code having a first repetition rate and a second code having a bit rate equal to the first code repetition rate. A received |
| 5278870 |
Reducing interference in r.f. signals |
January 11, 1994 |
| A radio receiver 1 has a device for reducing interference in an r.f. received signal, for example an HF signal conveying high speed data, including a channel estimator 3 for estimating the transmitted signal by comparing the received signal with locally generated signals processed in |
| 5274489 |
Thermal imager systems |
December 28, 1993 |
| A thermal imager system comprises a scanning system 1 for scanning a required scene 2 and an anamorphic optical system 3 for focusing the scanned scene onto a Sprite detector 4, the optical anamorphic system comprises a pair of optical prisms 17, 19 disposed between a collimating ele |
| 5257273 |
Amplifier/filter combination |
October 26, 1993 |
| An amplifier/filter combination including a fibre amplifier (4) and a fibre reflection/transmission filter (5) coupled to said amplifer. The fibre amplifier amplifies an input signal (1) in response to pump light (2) received from a laser. Preferably the fibre filter (5) is a chirped Bra |
| 5255075 |
Optical sensor |
October 19, 1993 |
| This invention relates to an optical sensor for testing a biochemical sample. The sensor includes a resonant mirror device 1 and a prism 2 disposed adjacent the device 1 for coupling an input beam of light to the device 1. The input beam of light having a comb spectrum with a uniform |
| 5249074 |
Bipolar junction transistor combined with an optical modulator |
September 28, 1993 |
| A combined bipolar junction transistor and an optical modulator comprising a plurality of semiconductor layers providing an optical mirror for the modulator, a collector for the transistor formed upon the plurality of semiconductor layers, the collector also forming an optical absorber o |
| 5243304 |
Vestigial sideband modulator for a baseband input signal |
September 7, 1993 |
| In a vestigial sideband modulator, an i.f. signal is modulated with a video input and the extreme part of one of the sidebands is removed to provide the right frequency response shape for transmission. The signal for transmission is usually produced by mixing the i.f. signal with an |
| 5237632 |
Optical fibre coil assemblies |
August 17, 1993 |
| An optical fiber coil assembly comprising two optically interconnected optical fiber coils or coil parts (22, 23) rigidly supported in predetermined positional relationship by respective rigid support means so constructed and arranged that static or quasi-static pressure (P) applied |
| 5229833 |
Optical sensor |
July 20, 1993 |
| An optical sensor includes a resonant mirror device 1, and a prism 2 disposed adjacent the device for coupling a beam of light into the device 1. The device 1 and the prism 2 are mounted on a rotatable platform. A beam of light is produced by He-Ne laser 3 and is linearly polarized with |
| 5227624 |
Optical sensing systems with plural wavelengths and wavelength sensitive sensors |
July 13, 1993 |
| An optical sensing system (e.g. hydrophone) includes a plurality of laser light sources for producing light signals of different frequencies which are combined by a Bragg cell and launched into a single optical fibre leading to an optical sensor array arrangement. This sensor array a |
| 5210409 |
Apparatus and method for sensing the relative position of two members employing a variable wavel |
May 11, 1993 |
| The relative position (M) of two members (33, 34) is sensed by scanning (S) an optical beam (25) over an encoded pattern (20) carried by one of the members, and by using a read head (21) secured to the other member to receive an optical signal transmitted from the encoded pattern (20). T |
