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...During the Civil War, the Confederacy established its own Patent Office which issued 266 patents, a third of which concerned implements of war.
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| Number | Title | Issue Date |
| 7995211 | Contra-propagative wave spectograph The invention relates to a spectrograph (11) comprising a waveguide (10) provided with accesses (10; 10b, 12), a means for injecting two guided contra-propagative waves by each accesses in such a way that a spatial interference is ... | 08/09/2011 |
| 7957005 | Fiber optic apparatus and method for sensing hazardous materials An apparatus and method for sensing hazardous materials utilizes first and second optical fibers and a recirculator coupled to a substrate. The first optical fiber is coupled to the substrate and has first and second opposing ends and a first substance embedded ther... | 06/07/2011 |
| 7952720 | Apparatus and method for using a counter-propagating signal method for locating events An apparatus and method for using a counter-propagating signal method for locating events is disclosed. The apparatus and method uses a Mach Zehnder interferometer through which counter-propagating signals can be launched. If the sensing zone of the Mach Zehnder int... | 05/31/2011 |
| 7876448 | Fiber-optic current sensor with sum detection To measure a sum of electrical currents in different conductors, light is led in an optical sensing fiber around all the conductors. The sensing fiber can be wound around the conductors in a single loop or in several individual loops. Interspersed polarization maint... | 01/25/2011 |
| 7499177 | Apparatus and method for using a counter-propagating signal method for locating events An apparatus and method for using a counter-propagating signal method for locating events is disclosed. The apparatus and method uses a Mach Zehnder interferometer through which counter-propagating signals can be launched. If the sensing zone of the Mach Zehnder int... | 03/03/2009 |
| 7499176 | Apparatus and method for using a counter-propagating signal method for locating events An apparatus and method for using a counter-propagating signal method for locating events is disclosed. The apparatus and method uses a Mach Zehnder interferometer through which counter-propagating signals can be launched. If the sensing zone of the Mach Zehnder int... | 03/03/2009 |
| 7397567 | Balanced optical-radiofrequency phase detector A balanced optical-RF phase detector for the extraction of low-jitter radiofrequency (RF) signals from optical pulse trains is demonstrated. The extraction of the low-jitter radiofrequency signals is based on the precise phase detection by use of a differentially bi... | 07/08/2008 |
| 7359586 | Fiber optic strain sensor and associated data acquisition system A fiber optic polarimetric strain sensor and associated data acquisition system capable of all-optical measurements of physical parameters, such as structural strain, gas and liquid pressure, acceleration and vibration, gas and liquid flow rate, and force without fi... | 04/15/2008 |
| 7339680 | Temperature-stabilized sensor coil and current sensor The fiber-optic sensor head (2) for a current or magnetic field sensor comprises an optical fiber which contains a magnetooptically active sensor fiber (3) and at least one polarization-maintaining supply fiber (5), which are optically connected... | 03/04/2008 |
| 7325456 | Interrogation network patches for active monitoring of structural health conditions Apparatus for monitoring structural health conditions of structures. The apparatus includes a piezoelectric device that has a bottom cover plate, piezoelectric rings concentrically disposed with respect to an axis and positioned on the bottom cover plate, and concen... | 02/05/2008 |
| 7310464 | Multi-wavelength optical source A multi-wavelength optical source includes a broadband optical source providing a broadband optical signal, and a modification module optically coupled to the broadband optical source. The modification module splits the broadband optical signal into a first output s... | 12/18/2007 |
| 7282716 | Digital imaging assembly and methods thereof A coherent radiation imaging system that produces digital images with a reduced amount of speckle. Radiation from a long coherence length source is used to form an image of a sample. The output coherent wave is temporally divided into a plurality of wavelets. The sp... | 10/16/2007 |
| 7277179 | Magneto-optical sensors A system for estimating a parameter selected from the group consisting of a current, a magnetic field, or combinations thereof comprises a resonant frequency tunable magneto-optical loop resonator, wherein the loop resonator comprises a magneto-optical sensing eleme... | 10/02/2007 |
| 7265848 | Time-resolved nonlinear complex sensitivity measuring apparatus A time resolved, nonlinear complex susceptibility measuring apparatus (1) that is capable of measurement unaffected by any distortion of the wave front of a probe light whereby a temporal change in the nonlinear complex susceptibility of a nonlinear optical m... | 09/04/2007 |
| 7266259 | Optical fiber microcoil, resonant structure and method of making the same An optical fiber coil of sub-micron diameter is shown to exhibit self-coupling between adjacent turns so as to form a three-dimensional optical resonator of relatively low loss and high Q. As long as the pitch of the coil and propagating wavelength remain on the sam... | 09/04/2007 |
| 7262834 | Sensor for measuring velocity of vibration using light waveguide This invention provides a device or method for measuring vibration with high sensitivity and over a wide bandwidth. A curved section is formed in an optical fiber. The curved section is disposed on a place to be measured. Light is input in the optical fiber, ... | 08/28/2007 |
| 7190462 | Fiber optic gyroscope having optical integrated circuit, depolarizer and fiber optic coil A light source 10 is connected sequentially through a single mode optical fiber and a coupler to one end of a polarization maintaining optical fiber, the other end of which is connected to an optical waveguide of an optical integrated circuit having a branchi... | 03/13/2007 |
| 7123836 | All-optical network distribution system The optical fiber-based communication system comprises a distribution optical fiber that extends proximately to a plurality of end users, and tap-off modules coupled to the distribution optical fiber at intervals along its length. Each of the tap-off modules include... | 10/17/2006 |
| 7106447 | Molecular optical air data systems (MOADS) A first beam of light from a laser is split by a beam splitter into a reference beam and at least one second beam of light, the latter of which is directed from an optical head into an atmosphere. Light from the at least one second beam of light scattered by molecul... | 09/12/2006 |
| 7102757 | Current measurement method and device based on a fiber optic in-line Sagnac interferometer A device for current measurement based on a fiber-optic in-line Sagnac interferometer includes a birefringence phase modulator for non-reciprocal phase modulation of two orthogonal polarization modes of a light beam passing through the interferometer. The phase modu... | 09/05/2006 |
| 7075286 | Fiber-optic current sensor An optical current sensor having a reflection interferometer (1, 10) has, in its fiber-optic lead (2), a polarization-maintaining first fiber branch (20) for two forward-traveling orthogonally polarized waves and a polarization-maintaining secon... | 07/11/2006 |
| 7046867 | Fiberoptic current sensor having a plurality of sensor heads The invention relates to a fiberoptic current or magnetic field sensor having a plurality of sensor heads, and to a corresponding measurement method. The sensor has a light source: N≧2 sensor heads; at least one phase modulation unit; a detector; a control and eva... | 05/16/2006 |
| 7038786 | Optical interferometric sensor with measureand compensation that may selectively be used for temperature compensation and long term life degradation In accordance with the preset invention, an optical interferometer employed as a current sensor is provided with visibility compensation and scale factor compensation. In accordance with the present invention, the interferometer is constructed so as to propagate a p... | 05/02/2006 |
| 7016047 | Active Q-point stabilization for linear interferometric sensors A linear interferometric sensor system in which the light output from the interferometric sensor is optically bandpass filtered before conversion to an electrical signal by an adjustable band-pass filtering device and the center wavelength of the adjustable band-pas... | 03/21/2006 |
| 6990269 | Fiber optic gyroscope In a fiber optic gyroscope comprising a light source, a fiber optic coupler, an optical integrated circuit having a function of a polarizer and a branching optical waveguide, and a fiber optic coil, and detecting an angular velocity applied to the fiber optic coil a... | 01/24/2006 |
| 6952268 | Magnetic shield for a fiber optic gyroscope A magnetic shielding system for a fiber optic gyroscope is disclosed. The fiber optic gyroscope may have a sensing coil with a sensing axis. An exemplary magnetic shield may enclose the sensing coil and have a layer including a plurality of pieces connected at a sea... | 10/04/2005 |
| 6891622 | Current sensor A method and device for measuring the current in a conductor are presented. They utilize the Faraday effect on counter-propagating circularly polarized beams of light in a fiber optic coil. The light beams are transformed to and from circular polarization by a polar... | 05/10/2005 |
| 6831749 | Sagnac interferometer current sensor A depolarizer 11 is inserted between an optical branch unit 2 and a polarization filter 3, a depolarizer 12 and a polarization filter 14 are inserted between an optical phase modulator 5 and a quarter-wave plate 16, a... | 12/14/2004 |
| 6825935 | Apparatus for and method of using optical interference of light propagating through an optical fiber loop A signal/vibration detecting technique employs a simple structure to identify a target optical fiber among many and carry out a bidirectional conversation through the target optical fiber. First ends of optical fibers (202A, 202B), one of which ... | 11/30/2004 |
| 6798523 | Sensor and method for detecting fiber optic faults A fiber optic fault detector and generic fiber optic sensor system for detecting breaks in an optical fiber using a low coherence interferometric technique. The system comprises a light source configured to produce light traveling along the optical path, a modulator... | 09/28/2004 |
| 6798524 | Phase difference calculation method, device, and system using optical fiber ring interference sensor A phase difference calculation method, a device (34), and a system (38) are disclosed. In an optical fiber ring interference sensor (37) using a 3×3 optical splitting coupler (30) and an optical splitting coupler (12), linear sect... | 09/28/2004 |
| 6778717 | Apparatus and method for monitoring a structure using a counter-propagating signal method for locating events A method and apparatus for monitoring a structure and for locating the position of an event including a light source, a waveguide, and a detector means. The waveguide receives light from the light source so that the light is caused to propagate in counter-propagatin... | 08/17/2004 |
| 6778279 | Inline sagnac fiber optic sensor with modulation adjustment A method is provided for sensing an environmental effect upon a sensing element and includes exposing the sensing element into the environmental effect, producing a light signal in the sensing element, modulating the light signal with a modulation signal, and determ... | 08/17/2004 |
| 6707558 | Decreasing the effects of linear birefringence in a fiber-optic sensor by use of Berry's topological phase The invention relates to the field of fiber optics, and more particularly to birefringence in single-mode fibers. The sensitivity of a fiber optic sensor coil for a current sensor may be increased by winding the sensing fiber, without torsion, around a current-carry... | 03/16/2004 |
| 6671426 | Monolithic integrated terahertz optical asymmetric demultiplexer An optical device which monolithically integrates a variety of structures to route or demultiplex data. One or more ring resonators are used to couple a control signal into and out of a waveguide loop residing within the optical device. The device include... | 12/30/2003 |
| 6636321 | Fiber-optic current sensor A fiber-optic current sensor has a reflection interferometer having a fiber-optic supply lead and a coil-shaped optical sensor fiber, the sensor fiber being connected with a first end to the fiber-optic supply lead, and being provided at a second, free en... | 10/21/2003 |
| 6621947 | Apparatus and method for monitoring a structure using a counter-propagating signal method for locating events A method and apparatus for monitoring a structure and for locating the position of an event including a light source, a waveguide, and a detector means. The waveguide receives light from the light source so that the light is caused to propagate in counter... | 09/16/2003 |
| 6618153 | On-line Sagnac interferometric distributed fiber-optic leakage detection device An on-line Sagnac interferometric distributed fiber-optic leakage detection device comprising a light generator, an optical fiber coupler, a hollow pipeline, a Faraday rotator mirror, a sensing optical fiber, a delaying optical fiber, a photo detection de... | 09/09/2003 |
| 6590664 | Interferometer with optical fiber interconnected dual arm sampler An interferometric system includes first, second and third optical fibers with first and second couplers. The first coupler is configured to receive radiation through the first fiber, provide a first radiation portion through the second fiber and provide ... | 07/08/2003 |
| 6563589 | Reduced minimum configuration fiber optic current sensor A reduced minimum configuration (RMC) fiber optic current sensor (FOCS) is proposed which includes a sensing coil or sensing region, a light source and an optical path arranged between the front output of the light source and the fiber optic sensing coil/... | 05/13/2003 |
