Did You Know...
...that one person who claimed to be the inventor of the television is Russian emigre Vladimir Zworykin? In 1929 David Sarnoff, founder of RCA, asked Zworykin what it would take to develop TV for commercial use. He said: a year and a half and $100,000. In reality, it took 20 years and $50 million! Before his death in 1982 at the age of 92, Zworykin said of his invention: "The technique is wonderful. It is beyond my expectations. But the programs! I would never let my children even come close to this thing."
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| Number | Title | Issue Date |
| 7330269 | Single sensor ring laser gyroscope A ring laser gyroscope is described which includes a laser cavity configured to provide an optical laser path for a pair of counter-propagating laser beams, an optical sensor configured to receive a portion of the energy from the counter-propagating laser beams, and... | 02/12/2008 |
| 7271915 | System, circuit and method for off-mode-peak operation of ring laser gyroscopes A system, circuit and method are disclosed for operating a Ring Laser Gyroscope (RLG) off-mode-peak to avoid exciting undesirable transverse modes. An alternate PLC operating point can be used to bias the optical path length of the RLG to an appropriate side of an i... | 09/18/2007 |
| 7260136 | Multiple laser cavity A method of using at least a part of a cavity for a first and at least one second laser includes providing a first laser beam to the part of the cavity, splitting the first beam into a first and a second part, splitting the first part into a third and a fourth part,... | 08/21/2007 |
| 7239135 | NMR gyroscope An NMR gyroscope in one example comprises a support structure affixed within an enclosure, an NMR cell affixed to the support structure, a plurality of permanent magnets disposed about the NMR cell to produce a magnetic field within the cell, and a field coil dispos... | 07/03/2007 |
| 7230686 | Four-mode stabilized solid-state gyrolaser without blind region The invention concerns solid-state gyrolasers used to measure rotation speeds or relative angular positions. This type of equipment is used, in particular, in aeronautical applications. The purpose of the invention is to complete the optic devices required to... | 06/12/2007 |
| 7126085 | Self-darkening shield for replaceably attaching to a torch A self-darkening shield for replaceably attaching to a torch. The self-darkening shield includes a shield and apparatus. The shield replaceably attaches to the torch, is self-darkening, and is a plate that is substantially inverted U-shaped to straddle the torch to ... | 10/24/2006 |
| 7100445 | Rotation rate sensor comprising a vibration gyroscope In a rotation rate sensor having a vibrational gyroscope which is part of at least one control loop which excites the vibrational gyroscope by supplying an excitation signal at its natural frequency, the vibrational gyroscope provides an output signal from which a n... | 09/05/2006 |
| 6973112 | Passive gas flow management and filtration device for use in an excimer or transverse discharge laser The present invention provides systems and methods for filtering particles and assisting gas flow management within laser systems. In one embodiment, a laser apparatus (100) includes an elongate laser chamber defining a chamber cavity (130) and an elec... | 12/06/2005 |
| 6950235 | Optical isolators and methods of manufacture Optical isolators and methods of manufacturing optical isolators are disclosed. The optical isolators are manufactured by directly bonding the parts of the isolators without the use of adhesive or mechanical devices to hold the individual parts together. ... | 09/27/2005 |
| 6920169 | Laser cavity A non-monolithic ring laser cavity comprising: (a) a gain medium (1); (b) a first polarization rotation element arranged to rotate the polarization of light propagating in the cavity with a predetermined handedness irrespective of the direction of propagation... | 07/19/2005 |
| 6538745 | Shock-tolerant multioscillator ring laser gyro The invention is a method and apparatus for processing signals with frequencies fL and fR from a multioscillator ring laser gyro, the method being repeated at regular time intervals. The difference fƊθ, of fL ... | 03/25/2003 |
| 6501258 | Optical spatial frequency measurement A signal processing apparatus for providing electrical frequency measurements of input signals. In one embodiment, a power splitter divides an RF input signal into first and second input signals. An RF channelizer having a filter bank receives the first i... | 12/31/2002 |
| 5786895 | Means and method for active dispersion equalization of a multioscillator ring laser gyroscope Based upon the equation, BIASG (IDE -ICOIL).multidot.(VDE -VOFF), where BIASG is the bias of a multi-oscillator ring-laser gyroscope (14) as induced by gain medium dispersion effect... | 07/28/1998 |
| 5751425 | Apparatus and method for detecting rotation rate, Faraday bias and cavity length in a ring laser gyroscope A ring laser gyroscope having an alternating Faraday bias includes mode combining apparatus arranged to cause interference between the modes that propagate within the cavity. Signal separating apparatus separates a signal indicative of rotation of the fra... | 05/12/1998 |
| 5737080 | Solid state nonplanar laser gyroscope A new concept of gyroscope utilizing self-modulation is introduced in a frame of a solid state ring type laser. The inventive solid state ring laser system includes a base, a laser pumping source, an active medium, a focussing unit, a detector, a magnet a... | 04/07/1998 |
| 5504579 | Multioscillator with combined optical and electronic signal processing An output system for a multioscillator includes a mixture of optical and electronic subsystems for separating and deriving the a.c. and d.c. HET signals of the right and left circularly polarized modes. An output prism includes a plurality of optical coat... | 04/02/1996 |
| 5485273 | Ring laser gyroscope enhanced resolution system Disclosed herein is a Ring Laser Gyroscope Enhanced Resolution System comprising, in a preferred embodiment, a sampling frequency modulation phase-locked loop (or "chirp") which is used in combination with the fast filter. Enhanced resolution is achieved ... | 01/16/1996 |
| 5469256 | Multipole magnetic geometry for a ring laser gyroscope Disclosed herein is a multi-pole magnetic geometry for a multi-oscillator ring laser gyroscope. Multi-pole magnetic geometry configurations are disclosed which are useful for providing Faraday rotation where the multi-oscillator uses a Faraday rotator and... | 11/21/1995 |
| 5442441 | Radio frequency excited ring laser gyro Apparatus for stabilizing the position of the exciting electric component of a radio frequency electromagnetic field within the excited plasma of a ring laser, using two adjacent quarterwave coils, and driving the coils from a radio frequency source to en... | 08/15/1995 |
| 5420683 | Multioscillator ring laser gyro beam combining optics Multioscillator beam-combining optics having prisms for processing both clockwise and anticlockwise elliptically polarized beams having both helicities transmitted through a partly transmissive corner mirror. The optical structure uses a thin-film polariz... | 05/30/1995 |
| 5412475 | Diagonal pathlength control A ring laser gyro uses a nonplanar path having at least one plane of mirror symmetry and two pathlength control mirrors in order to reduce scatter variations occurring during the operation of the laser gyro. The mirrors used to produce such path are fixed... | 05/02/1995 |
| 5386288 | Split gain multimode ring laser gyroscope and method A ring laser gyroscope uses a lasing-mode suppression technique to circumvent frequency locking rather than more common frequency biasing methods. The device operates with a four-mirrored nonplanar optical path that allows left and right circularly polari... | 01/31/1995 |
| 5384636 | External scatter removal system Disclosed herein is an External Scatter Removal System for Ring Laser Gyroscopes (such as a Split Gain Multioscillator) comprising a prism mounted on an optoisolator, wherein light transmitted out at least one of the mirrors of the Gyroscope passes into t... | 01/24/1995 |
| 5374990 | Active magnetic field tuning for dispersion equalization of a multi-oscillator Dispersion in a multi-oscillator cavity is equalized by processing information extracted from the laser beams within the cavity to generate an error signal representative of dispersion bias, and applying a bias control signal to the cavity in such a way a... | 12/20/1994 |
| 5371590 | Ring laser gyro A ring laser gyro uses a composition for the gain medium which optimizes the effect of the Fresnel-Fizeau drag on the output signal of the gyro. In one embodiment, a composition of the gain medium is used which produces no change in the Fresnel-Fizeau com... | 12/06/1994 |
| 5367377 | Solid state split-gain multioscillator ring laser gyroscope Disclosed herein is a Solid State Split-Gain Multioscillator Ring Laser Gyroscope comprising, in a preferred embodiment, a solid state Nd:YAG crystal body defining a non-planar resonator path. Magnetic sources are provided which effectuate the Split-Gain ... | 11/22/1994 |
| 5347360 | Ring laser gyro A ring laser gyro uses means for shaping the gas flow, which inevitably develops as a result of a DC discharge, to optimize the effect of the Fresnel-Fizeau drag on the output signal of the gyro. In one embodiment, a sufficient component of the gain mediu... | 09/13/1994 |
| 5333046 | Diagonal pathlength control A ring laser gyro uses a nonplanar path having at least one plane of mirror symmetry and two pathlength control mirrors in order to reduce scatter variations occurring during the operation of the laser gyro. The mirrors used to produce such path are fixed... | 07/26/1994 |
| 5323227 | Quad gain ring laser gyroscope with independent gain regions A ring laser gyroscope having four independent gain regions each of which drives only one of four modes lasing within the cavity. A non-planar cavity of four intersecting segments of equal lengths is formed within a frame. Versions are disclosed for excit... | 06/21/1994 |
| 5305085 | Radio frequency excited ring laser gyroscope with common induction coil A split gain multi-mode ring laser gyroscope is disclosed having a radio frequency excitation induction coil which also serves the magnetic mode suppression system, suppressing undesirable modes of the gain curve to achieve the split gain effect. The indu... | 04/19/1994 |
| 5208653 | Multioscillator ring laser gyroscope adaptive digitally controlled cavity length control system Disclosed herein is a Digitally Controlled Cavity Length Control System comprising, in a preferred embodiment, an adaptive servo-loop for cavity length, modulation depth and amplitude control, and of the multioscillator ring laser gyroscope; thereby, perm... | 05/04/1993 |
| 5196905 | Radio frequency excited ring laser gyroscope A radio frequency excitation system is disclosed for use in conjunction with a ring laser gyroscope. The radio frequency excitation system is comprised of a closed resonant cavity which surrounds a helical coil driven at a high radio frequency at a range ... | 03/23/1993 |
| 5189487 | Multioscillator ring laser gyroscope local oscillator-based output optics detection system A rotational sensing system for a Multioscillator ring laser gyroscope is disclosed herein that can operate with a simple upright symmetric optics mechanism, where the required signal separation is performed fully electronically, with the use of a local o... | 02/23/1993 |
| 5157462 | Split-gain multimode ring laser gyroscope output optics detection system A rotational sensing system for a split gain, multi-mode ring laser gyroscope is disclosed herein that can operate with a simple upright symmetric optics mechanism, where the required signal separation is performed fully electronically. In a preferred emb... | 10/20/1992 |
| 5116128 | Mirror transducer assembly for ring laser gyroscope Disclosed herein is a Pathlength Control Assembly for Ring Laser Gyroscope comprising, in a preferred embodiment, a mirror, coupled to a mirror housing including a mirror post, wherein the mirror is mounted on an axially deflectable membrane of the housin... | 05/26/1992 |
| 5116132 | Ring laser gyroscope output optics detection system A ring laser gyroscope output optics detection system, including a rotational sensing system and cavity length control system for a multioscillator ring laser gyroscope, is disclosed herein that can operate with a simple upright symmetric optics mechanism... | 05/26/1992 |
| 5096297 | Multi-oscillator ring laser gyroscope with improved stabilization The gyroscope had a closed optical path (10) defined by four reflecting surfaces (11, 12, 13, 14). Counter-rotating beams of radiation circulating around the closed path are produced by a gaseous active lasing medium executed over a gain region (15) to pr... | 03/17/1992 |
| 5080487 | Ring laser gyroscope with geometrically induced bias An out of plane ring laser gyroscope comprises a frame and a cavity formed in the frame to provide a non-planar closed optical pattern. A gain medium produces two light beams propagating in opposite directions in the cavity. A magnetic device applies an a... | 01/14/1992 |
| 5004343 | Multiple ring paths in one block A laser gyro system wherein a plurality of nonplanar ring laser gyros are nested within a common supporting block of material. The nonplanar ring laser gyros have a ring path whose circumscribing volume has a size of the order of the volume of the support... | 04/02/1991 |
| 4969743 | Faraday magnet for the reduction of multi-oscillator bias thermal sensitivity Disclosed herein is a ring laser gyroscope having a non-reciprocal polarization rotation device such as a Faraday rotator configured to provide, through use of a Faraday magnet, a relatively uniform magnetic field across the profile of the Faraday rotator... | 11/13/1990 |
