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Cloaking System Using Optoelectronically Controlled Camouflage
A Cloaking System designed to operate in the visible light spectrum, utilizes optoelectronics and/or photonic components to conceal an object within it.
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| Number | Title | Issue Date |
| 7347096 | Digital accelerometer A force-balance accelerometer having a pick-off coil responsive to displacement of a seismic mass from a balance position for providing an output corresponding to the displacement, includes a digital signal processor including tow pulse width modulation generators f... | 03/25/2008 |
| 7347097 | Servo compensating accelerometer A servo compensating accelerometer includes a top housing half and a bottom housing half rigidly connected together, and each having coaxial threaded openings. A sensing element is positioned between the top and bottom halves and affixed to the bottom half. Top and ... | 03/25/2008 |
| 7334474 | Force balanced instrument system and method for mitigating errors A force balanced instrument system and method for mitigating errors is provided. The system and method mitigate errors in measurement readings caused by charge buildup in force balanced instruments that employ charge pulses to generate an electrostatic force to null... | 02/26/2008 |
| 7331229 | Magnetic null accelerometer An accelerometer system includes a capacitor plate fixed within a housing and a flexure plate positioned substantially parallel to the capacitor plate a distance therefrom. The distance varies in response to acceleration forces acting upon the flexure plate such tha... | 02/19/2008 |
| 7296469 | Magnetofluidic accelerometer with active suspension A method of measuring acceleration includes suspending an inertial body using a magnetic fluid; generating a magnetic field within the magnetic fluid; modulating the magnetic field to counteract a change in position of the inertial body relative to sources of the ma... | 11/20/2007 |
| 7274079 | Sensor design and process An accelerometer (305) for measuring seismic data. The accelerometer (305) includes an integrated vent hole for use during a vacuum sealing process and a balanced metal pattern for reducing cap wafer bowing. The accelerometer (305) also includes... | 09/25/2007 |
| 7252001 | Three axis active magnetic levitation for inertial sensing systems The invention relates to an inertial sensor based on the magnetic levitation of an inertial mass comprising an active magnetic bearing unit arranged in such a way as to levitate the inertial mass and characterized by the fact that it furthermore comprises additional... | 08/07/2007 |
| 7178399 | Housing for magnetofluidic accelerometer A housing for a magnetofluidic sensor where the sensor has a plurality of drive magnet assemblies, magnetic fluid and an inertial body. The housing has a plurality of ports for securing respective drive magnet assemblies, such that a portion of each drive magnet ass... | 02/20/2007 |
| 7155979 | Self-calibrating oversampling electromechanical modulator and self-calibration method An oversampling electromechanical modulator, including a micro-electromechanical sensor which has a first sensing capacitance and a second sensing capacitance and supplies an analog quantity correlated to the first sensing capacitance and to the second sensing capac... | 01/02/2007 |
| 7036374 | Micro-machined suspension plate with integral proof mass for use in a seismometer or other device An accelerometer or a seismometer using an in-plane suspension geometry having a suspension plate and at least one fixed capacitive plate. The suspension plate is formed from a single piece and includes an external frame, a pair of flexural elements, and an integrat... | 05/02/2006 |
| 6945110 | Sensor design and process An accelerometer (305) for measuring seismic data. The accelerometer (305) includes an integrated vent hole for use during a vacuum sealing process and a balanced metal pattern for reducing cap wafer bowing. The accelerometer (305) also includes... | 09/20/2005 |
| 6933873 | PWM-based measurement interface for a micro-machined electrostatic actuator Methods and apparatus for varying and measuring the position of a micromachined electrostatic actuator using a pulse width modulated (PWM) pulse train are disclosed. One or more voltage pulses are applied to the actuator. In each of the pulses, a voltage changes fro... | 08/23/2005 |
| 6918299 | Method and apparatus for improving performance of a force balance accelerometer based on a single-coil velocity geophone The invention concerns methods and apparatus for improving the performance of a force-balance accelerometer based upon a conventional, single-coil, velocity geophone. Specifically, the operating temperature range is increased through the use of both a temperature-co... | 07/19/2005 |
| 6898970 | Inertial navigation device for ion propulsion driven spacecraft An extremely sensitive accelerometer suitable for use in extreme temperatures such as those encountered during space travel is formed by levitating a magnet in a box or sphere composed of diamagnetic material such as pyrolytic carbon, and a means for measuring the p... | 05/31/2005 |
| 6832518 | Pressure wave sensor using levitated mass A mass is levitated with respect to a base, at least one of which is comprised of a diamagnetic material, with the levitated mass also having a permanent magnetic property. A second permanent magnet is optionally configured such that it attracts the levitation mass ... | 12/21/2004 |
| 6799462 | Gravimetric measurement method and system A mass is levitated with respect to a base at least one of which is comprised of a diamagnetic material, and the levitation mass also having a permanent magnetic property. A second permanent magnet is configured such that it attracts the levitation mass away from sa... | 10/05/2004 |
| 6718605 | Single-side microelectromechanical capacitive accelerometer and method of making same A high sensitivity, Z-axis, capacitive microaccelerometer having stiff sense/feedback electrodes and a method of its manufacture on a single-side of a semiconductor wafer are provided. The microaccelerometer is manufactured out of a single silicon wafer and has a si... | 04/13/2004 |
| 6665110 | Diagonal to rectangular pixel mapping for spatial light modulator A method of mapping diagonal rows and columns of two-dimensional grid elements to rectangular rows and columns of two-dimensional grid elements. The method is of particular use with a spatial light modulator in optical equalization application.... | 12/16/2003 |
| 6571631 | Displacement sensor and movement information collecting device comprising the same There is provided a displacement sensor including a moving member composed of a magnetic body; a pair of stators each composed of a magnetic body and arranged opposed to each other with respect to the moving member, the stators including driving coils and... | 06/03/2003 |
| 6341259 | Microsystems integrated testing and characterization system and method An improved microsystems testing and characterization system which allows the system user to identify specific structures, and thereby to initiate an automated testing sequence to be applied to that structure or a series of structures. The integrated cont... | 01/22/2002 |
| 6170331 | Detecting rotational acceleration Rotational motion about at least two different axes may be resolved to measure the direction, magnitude and pivot point of the rotational displacements In some embodiments, these measurements may be made by a device which may be integrated into a silicon ... | 01/09/2001 |
| 6076403 | Electromagnetic accelerometer An electromagnetic accelerometer includes a peripheral frame, a mass suspended from the peripheral frame, a plurality of strain gauges configured to detect displacement of the mass, and a magnetic motor. The magnetic motor includes a first pole piece defi... | 06/20/2000 |
| 6073490 | Servo accelerometer The present invention is a compensation accelerometer comprising a separable housing, a sensitive element mounted in the housing on an elastic suspension element, an angle sensor, a servo amplifier and a momentum sensor. In the proposed accelerometer, the... | 06/13/2000 |
| 6012333 | Vibration control device for rotating objects The vibration control device comprises an electromechanical transducer module adapted to be attached to an outer surface of a rotating object, and a control circuit for electrically controlling an internal stress of the electromechanical transducer module... | 01/11/2000 |
| 5962788 | Transducer A force transducer in which a deflectable seismic mass is supported on a frame by support means is disclosed. The seismic mass at rest includes a plane and when the seismic mass is deflected by any force the mass always retains the plane parallel to the r... | 10/05/1999 |
| 5877421 | Acceleration sensor An acceleration sensor has a mass part movably attached over a substrate with pairs of electrodes arranged relative to the mass part so that one electrode of each pair is under the mass part and the other electrode of that pair is arranged above the mass ... | 03/02/1999 |
| 5852242 | Apparatus with mechanical and electric springs and method for its manufacture Apparatus for measuring a characteristic of motion and methods for its manufacture are disclosed in which a sensor structure includes a support structure, and a mass suspended from such support structure by a spring connecting arrangement and electrical d... | 12/22/1998 |
| 5817942 | Capacitive in-plane accelerometer An accelerometer having one or more flexure stops for increasing the stiffness of the flexures when the accelerometer is subjected to relatively high acceleration. A wrap-around proof mass is suspended over a substrate by anchor posts and a plurality of f... | 10/06/1998 |
| 5817939 | Proof mass support and sensing system A proof mass support system has a pair of alignment coils for controlling the rest position of an elongate proof mass. The alignment coils are constructed to provide a levitation force when they carry electric currents which varies along the length of the... | 10/06/1998 |
| 5814727 | Semiconductor accelerometer having reduced sensor plate flexure A semiconductor accelerometer is formed with a sensor plate that remains substantially planar when acceleration forces are applied. The sensor plate is supported by support beams that are attached to the sensor plate at constraint points. A portion of the... | 09/29/1998 |
| 5789677 | Dual-axis force feedback accelerometer A force-feedback accelerometer to measure small accelerations along two or more co-planar axes. A fiber suspension of a proof mass provides mechanical sensitivity; a cylindrical cross-section on the proof mass, with orthogonal optical position sensing, re... | 08/04/1998 |
| 5679436 | Micromechanical structure with textured surface and method for making same A method for forming sub-micron sized bumps on the bottom surface of a suspended microstructure or the top surface of the underlying layer in order to reduce contact area and sticking between the two layers without the need for sub-micron standard photoli... | 10/21/1997 |
| 5604309 | Electronics for Coriolis force and other sensors Electronics for use in Coriolis and other sensors for reducing errors in the sensor output signal. An off-frequency drive scheme includes a frequency translation circuit in the excitation feedback loop of a sensor system to suppress components of the sens... | 02/18/1997 |
| 5604308 | Data interface for closed-loop accelerometer A digital circuit for adapting the output of a closed-loop accelerometer to a utilization circuit where the cycle time of the rebalance loop of the accelerometer is unrelated to the cycle time of the utilization circuit. A register receives and stores a d... | 02/18/1997 |
| 5596144 | Piezoresistive force rebalance accelerometer A motion sensor is provided for sensing motion or acceleration of a body, such as an accelerometer for use in an on-board automotive safety control system or navigational system. The motion sensor is a piezoresistive motion sensor that operates in a close... | 01/21/1997 |
| 5587530 | Low stress magnet interface for a force rebalance accelerometer A force rebalance accelerometer includes a proof mass suspended by one or more flexures between stationary mounted upper and lower excitation rings. Pick-off capacitance plates formed on opposing sides of the proof mass form capacitance elements whose cap... | 12/24/1996 |
| 5417111 | Monolithic chip containing integrated circuitry and suspended microstructure The invention is a monolithic sensor comprising a silicon substrate, a suspended polysilicon microstructure for sensing a condition disposed above and suspended from the substrate, and circuitry for resolving a signal based on said sensed condition, the c... | 05/23/1995 |
| 5331852 | Electromagnetic rebalanced micromechanical transducer A method and apparatus for electromagnetically rebalancing a micromechanical transducer via a plurality of current carrying electrodes disposed beneath or above the transducer interacting with a current carrying conductor disposed on the transducer. In a ... | 07/26/1994 |
| 5243544 | Microgravity accelerometer data acquisition system Accelerometer apparatus for a space vehicle includes sensors for sensing accelerations on board the vehicle which provide accelerometer input signals. Interface circuits are coupled to receive the accelerometer input signals and attenuate DC bias and remo... | 09/07/1993 |
| 5220831 | Closed loop temperature compensation for accelerometer current scale factor A temperature compensation system for a force balance accelerometer is disposed within a feedback loop. A series resistor (82) is connected in series with torque coils (30,80). Connected in parallel with the torque coils and the series resistor (82) is a ... | 06/22/1993 |
