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| Number | Title | Issue Date |
| 6205200 | Mobile X-ray unit A portable X-ray unit, of a relatively light-weight, occoping a volume of less then one-half a cubic foot containing an x-ray head assembly, a unique Marx generator, a plurality of spark-gap switches and control electronics is disclosed. The Marx generato... | 03/20/2001 |
| 6100831 | Optoelectronic analog-to-digital converter using wavelength division multiplexing An optoelectronic system is provided for converting analog electrical sigs into digital electrical signals. An optical carrier produced by a laser source is separated into spectral components. An electro-optical modulator modulates the optical carrier wi... | 08/08/2000 |
| 5949935 | Infrared optical fiber coupler An infrared fiber optic coupler and a method for making an infrared fiber optic coupler are disclosed. The method comprises the steps of: braiding first and second infrared transmitting glass fibers to form first and second arms of the infrared fiber opti... | 09/07/1999 |
| 5945666 | Hybrid fiber bragg grating/long period fiber grating sensor for strain/temperature discrimination A grating sensor system for simultaneously determining strain and temperature is disclosed, which system comprises: a light source for providing a continuous broadband light; a single mode fiber coupled to the light source; a hybrid fiber grating sensor w... | 08/31/1999 |
| 5933808 | Method and apparatus for generating modified speech from pitch-synchronous segmented speech waveforms A system that synchronously segments a speech waveform using pitch period and a center of the pitch waveform. The pitch waveform center is determined by finding a local minimum of a centroid histogram waveform of the low-pass filtered speech waveform for ... | 08/03/1999 |
| 5867329 | Multiple-pass reflection filter An optical filter that uses multiple reflections to provide spectral bandpass filtering of ultraviolet, visible and infrared radiation with a very high transmission of wavelengths within a selected passband coupled with exceptional off-band rejection. The... | 02/02/1999 |
| 5838428 | System and method for high resolution range imaging with split light source and pattern mask A high-resolution range imaging system and method can sense the presence of and determine the position or range of each point on the surface of an object through triangulation calculation methods. A moving pattern of light is projected onto the object to ... | 11/17/1998 |
| 5838675 | Channelized receiver-front-end protection circuit which demultiplexes broadband signals into a plurality of different microwave signals in respective contiguous frequency channels, phase adjusts and multiplexes channels A channelized protection circuit for protecting the front-end of a receiver rom the detrimental effects of interference signals within the bandwidth of received signals is disclosed. The channelized protection circuit comprises: a frequency demultiplexer f... | 11/17/1998 |
| 5818585 | Fiber Bragg grating interrogation system with adaptive calibration A system and method for providing accurate measurements of the reflected wavelengths from multiple strings of fiber Bragg grating (FBG) elements using a single scanning optical filter and an isolated duplicate reference string of FBG elements. A reference... | 10/06/1998 |
| 5805753 | Optical fibers with high acceleration sensitivity and low pressure sensitivity An optical fiber which includes a light transmitting center portion, a prcting layer and a stress preventing layer. The protecting layer concentrically surrounds the center portion, and reduces the effect of environmental factors on the center portion. T... | 09/08/1998 |
| 5754572 | Mirrorless, distributed-feedback, ultraviolet, tunable, narrow-linewidth, solid state laser A mirrorless, distributed-feedback (DFB), ultraviolet, tunable, narrow-liidth, solid state laser for remote sensing and medical applications is disclosed. Optical pumping in the DFB laser is accomplished using a frequency quadrupled, 10 Hz., Q-switched, ... | 05/19/1998 |
| 5739536 | Fiber optic infrared cone penetrometer system A system for the in-situ detection of chemicals, including water, in soil comprises: a penetrometer for penetrating the soil, the penetrometer including interior and exterior surfaces, and a window for allowing infrared radiation to be transmitted between... | 04/14/1998 |
| 5706079 | Ultra-high sensitivity transducer with chirped bragg grating relector A transducer and measurement system includes a fiber Bragg grating which a regular variation of spacing of partially reflecting surfaces, known as a chirp, either formed or induced therein and which is capable of reflecting energy having a predetermined... | 01/06/1998 |
| 5680489 | Optical sensor system utilizing bragg grating sensors An optical system for detecting perturbations indicative of the performance f the piece of equipment being monitored is disclosed. The optical system comprises sensors each of which use Bragg gratings induced therein and wherein the Bragg gratings are arra... | 10/21/1997 |
| 5668779 | Hydrophone group design for shallow towed applications A hydrophone group for shallow towed applications in less than 50 feet of ter. The hydrophone group has a series of hydrophones connected by relatively insensitive fiber optic interconnects. The individual hydrophones are sufficiently sensitive such that ... | 09/16/1997 |
| 5655022 | Apparatus and method for synchronizing nonlinear systems using filtered signals A filtered cascaded synchronized nonlinear system includes a nonlinear transmitter having stable first and second subsystems. The first subsystem produces a first transmitter signal for driving the second subsystem, and the second subsystem produces a sec... | 08/05/1997 |
| 5651019 | Solid-state blue laser source A blue laser source outputting a beam having a wavelength of approximately 460 nm. A first laser cavity is formed around a Nd:YAG gain medium generating a first light beam having a wavelength of approximately 1064 nm. A second laser cavity, at least parti... | 07/22/1997 |
| 5642445 | System for determining an interior or exterior acoustic noise level of an enclosed structure and noise reduction device incorporating such system The acoustic noise monitor determines acoustic sound levels radiated or stered to an exterior or interior fluid space of a structure such as an enclosed structure by measuring a condition, such as strain level, of the structure itself rather than by dire... | 06/24/1997 |
| 5633960 | Spatially averaging fiber optic accelerometer sensors An optical fiber which includes a light transmitting center portion, a prcting layer and a stress preventing layer. The protecting layer concentrically surrounds the center portion and the stress preventing layer concentrically surrounds the center porti... | 05/27/1997 |
| 5568049 | Fiber optic faraday flux transformer sensor and system A fiber optic Faraday flux transformer sensor is disclosed which comprises: a closed loop of wire being responsive to a first time-varying magnetic field from a remote source for producing a secondary time-varying magnetic field which varies as a function... | 10/22/1996 |
| 5568496 | Laser optics protective device A broadband thermal optical limiter disposed between a laser oscillator and laser amplifier system for protecting optical components in the laser oscillator from damage due to amplified optical feedback from the laser amplifier system at all near ultravio... | 10/22/1996 |
| 5561676 | Compound-cavity, high-power, modelocked semiconductor laser The invention is for a new type of an efficient and compact laser system, based on semiconductor gain medium, which produces high peak power. The laser system comprises: a compound cavity laser defined by first and second reflective elements; a developing... | 10/01/1996 |
| 5535402 | System for (N.cndot.M)-bit correlation using N M-bit correlators An extended length digital correlator threshold circuit for (N.multidot.Mit correlation using N M-bit correlators is disclosed. For the exemplary case where N=2, the digital correlator threshold circuit comprises: a first circuit for storing a preselecte... | 07/09/1996 |
| 5528367 | In-line fiber etalon strain sensor An in-line fiber etalon strain sensor, and method for making the sensor, is disclosed. The in-line fiber etalon strain sensor uses a short segment of silica hollow-core fiber spliced between two cleaved sections of single-mode fiber to form a mechanically... | 06/18/1996 |
| 5491335 | Fiber optic transducer with fluid coupling means between optical fiber and transduction material A fiber optic transducer includes a fiber optic cable or ribbon, a sensor, fluid material for coupling the fiber optic medium to the sensor and an affixing material to optionally affix the position of the sensor position relative to the fiber optic ribbon... | 02/13/1996 |
| 5491579 | Broadband thermal optical limiter for the protection of eyes and sensors A broadband thermal optical limiter for protecting a light-sensitive object from intense laser beams at all near ultraviolet, visible and near infrared wavelengths is disclosed. The broadband thermal optical limiter comprises: a sample cell containing a s... | 02/13/1996 |
| 5438411 | Electronic phase-tracking open-loop fiber optic gyroscope A simplified signal processing technique for the open-loop fiber optic gyroscope is described which is based on the electronic closed-loop `phase-shift nulling` concept. The system provides a linear output from an open-loop gyroscope configuration over a ... | 08/01/1995 |
| 5422596 | High power, broadband folded waveguide gyrotron-traveling-wave-amplifier A folded waveguide gyrotron-traveling-wave-amplifier comprises: an electron gun for transmitting an axis-encircling beam of electrons with large transverse energy along a first path having an axis; an RF source for producing and applying in a second path ... | 06/06/1995 |
| 5416859 | Broadband, low drive voltage, electrooptic, intergrated optical modulator A broadband, electrooptic modulator is disclosed which, in a first embodiment, comprises: a substrate having substrate modes, having electrooptic effects, and having a first optical waveguide adapted to receive and transmit light therethrough in a first d... | 05/16/1995 |
| 5410499 | Phase shifter for directly sampled bandpass signals A phase shifter for shifting the phase of directly sampled bandpass signals ithout having to convert to complex (I,Q) form is disclosed. An application requiring a plurality of appropriately phase shifted signals is a phased array antenna. In the operation... | 04/25/1995 |
| 5396166 | Fiber optic interferometric electric field and voltage sensor utilizing an electrostrictive transducer A fiber optic interferometer sensor system utilizing a fiber optic interferometer with an elecrostrictive transducer bonded to one of first and second optical fiber arms of the interferometer for obtaining excellent low frequency voltage detectors and ele... | 03/07/1995 |
| 5394378 | Hydrophone transduction mechanism A sensing portion for an interferometric planar hydrophone is disclosed which comprises: a support assembly; a plurality of hollow compliant mandrels mounted to the support assembly in a fixed planar relationship with respect to each other to form a plana... | 02/28/1995 |
| 5388112 | Diode-pumped, continuously tunable, 2.3 micron CW laser A room-temperature solid state laser for producing an output laser emission t any wavelength within a preselected range of wavelengths is disclosed. In a preferred embodiment, the laser comprises: a pump laser for emitting a CW pump beam at a preselected w... | 02/07/1995 |
| 5381433 | 1.94 μm laser apparatus, system and method using a thulium-doped yttrium-lithium-fluoride laser crystal pumped with a diode laser A laser apparatus, system and method include a laser crystal formed of thulium-doped yttrium-lithium-fluoride, and a laser diode arranged in proximity to the laser crystal. The laser diode is capable of emitting a first laser light which is suitable for u... | 01/10/1995 |
| 5373297 | Microwave repeater with broadband active and/or passive isolation control A microwave repeater with antenna isolation comprises a first receiving anna for receiving an input signal from a distant source; an amplifier section for amplifying and modulating the input signal to produce an output signal; a transmitting antenna coup... | 12/13/1994 |
| 5359612 | High repetition rate, mode locked, figure eight laser with extracavity feedback An optical pulse generator for producing mode-locked optical pulses comprises: a beam splitter; first and second optical loops coupled together by the beam splitter so as to define a figure eight optical path in which a light beam propagating toward the b... | 10/25/1994 |
| 5331404 | Low noise fiber gyroscope system which includes excess noise subtraction A system and method for subtracting excess noise from a high sensitivity gyroscope system in which a laser diode array is focused into an Nd-doped active fiber. A resultant gyro signal is polarized, detected, and amplified. A noise signal is polarized, de... | 07/19/1994 |
| 5319440 | Fiber optic gyroscopes with depolarized light A depolarized fiber optic gyroscope with a detector for detecting a rotat about an axis of rotation and a method therefor is disclosed. The gyroscope includes a depolarized light source for generating the depolarized light; a gyro coil for conducting dep... | 06/07/1994 |
| 5319652 | Super luminescent light source A fiber superfluorescent light source is disclosed which suppresses laser cillations without interfering with the pump light or the super luminescence. In a preferred embodiment of the invention, the fiber superfluorescent light source comprises a laser d... | 06/07/1994 |
| 5313477 | Rare earth ion doped CW cascade fiber laser A continuous wave(CW) activator ion doped fiber laser is presented which lases at a normally self-terminating laser transition at a slope efficiency greater than that achieved by a self-terminating fiber laser. Two laser transitions, one corresponding to ... | 05/17/1994 |
