Abstract: In a method for determining the zero-point error of a Coriolis gyro, the resonator of the Coriolis gyro has a disturbance force applied to it such that a change in the stimulation oscillation of the resonator is brought about. A change in the read oscillation of the resonator, caused by a partial component of the disturbance force, is extracted from a read signal which represents the read oscillation of the resonator as a measure of the zero-point error.
Abstract: A method for determination of the zero error of a Coriolis gyro. Appropriate disturbance forces are applied to the resonator of the Coriolis gyro such that at least one natural oscillation of the resonator is stimulated that differs from the stimulating and read oscillations. A change in a read signal which represents the read oscillation and results from the stimulation of the at least one natural oscillation is determined as a measure of the zero error.
Abstract: Convertible eyewear permits ready conversion between various optical modes. A removable shield is removable secured by magnetic force to a frame by the interaction of at least one magnetic rivet recessed within the frame and at least one magnetic rivet that protrudes from the shield. The mating magnetic rivets may have contacting surfaces of oval shape with the rivet recessed within an oval-shaped channel to prevent misalignment of frame and shield with a single point of magnetic contact. A prescription lens insert and a goggle adapter, each having a protruding magnetic rivet, are compatible for magnetic fixation to the frame of the eyewear.
Abstract: In a method for electronic tuning of the frequency of the read oscillation to the frequency of the stimulation oscillation in a Coriolis gyro, the resonator of the Coriolis gyro has a disturbance force applied to it such that the stimulation oscillation remains essentially uninfluenced. The read oscillation is changed so that a read signal that represents the read oscillation contains a corresponding disturbance component. The frequency of the read oscillation is controlled so that the phase shift between the disturbance signal and the disturbance component contained in the read signal is a minimum.
Abstract: A method for compensation of the zero error of a Coriolis gyro. The frequency of the read oscillation is modulated. The output signal from a rotation rate control loop or quadrature control loop for the Coriolis gyro is demodulated in synchronism with the modulation of the frequency of the read oscillation to obtain an auxiliary signal. The auxiliary signal is a measure of the zero error. A compensation signal is produced and passed to the input of the rotation rate control loop or quadrature control loop, with the compensation signal being controlled such that the magnitude of the auxiliary signal is as small as possible.
Abstract: The method according to the invention for preventing bias errors as a result of synchronous interference in fiber-optic gyroscopes (FOGs) provides for an additional signal ?E, which is periodical at the sampling clock rate and corresponds, for example, to a synchronous interference signal input to be added in the form of additional modulation to the modulation signal for a phase modulator within an MIOC. The demodulated detector signal from the FOG is preferably then correlated with the additional modulation, that is to say which is multiplied by the additional modulation and is added to it. The added-up signal, which is dependent on the error matching, controls a VCO (12) which readjusts the operating frequency of the FOG until the correlation tends to zero. The method can be used not only for phase ramp modulation but also for FOGs which operates using a random phase modulation method.
Abstract: A method for increasing the long-term operational reliability of a fiber optic interferometer. Noise in a detector output signal is set to a desired value by correcting the detector light power. Detector light power is corrected by varying a light source current of a light source of the interferometer. A change in the light source power results. It is thereby possible to increase both the reliability and useful life of the interferometer.
Abstract: In a GPS-supported inertial attitude and heading reference system equipped with a Kalman correction filter and a multiple axis fiber optic gyroscope, the invention provides for only that scale factor error which is determined for the measurement axis (e.g. the vertical axis) with relatively fast motion dynamics to be used as the Kalman filter correction value for the scale factor error correction for all the measurement axes of the FOG to determine and compensate for the scale factor error caused by changes in the wavelength of a common light source. The scale factor error correction is used only with a long time constant.
Abstract: A highly stable broadband light source includes a semiconductor light source having a specific emission spectrum, an optical filter having a specific bandpass filtering function and a predetermined bandwidth and a coupling element, to which the light emissions of the semiconductor light source and of the optical filter are fed. The light emission of the broadband light source occurs at the output of the coupling element. The spectrum of the light emission of the broadband light source is composed of the emission spectrum of the semiconductor light source and the bandpass filtering function of the optical filter. The wavelength of the optical filter is temperature-stabilized so that the spectrum of light emission of the broadband light source is essentially determined solely by the filtering function of the optical filter.
Abstract: 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 modulator is a digital phase modulator that is directly digitally drivable to permit simplification of the corresponding signal processing or driving electronics unit.
Abstract: A method for secured access to data in a network has the effect that data protection rights are respected, especially personal data present in a network with distributed memories. The method is based on the granting of access rights, with the possibility of revocation, to the data available in the network, and the storage of data within the network only after authorization by the owner of the rights to the data. When certain data are requested, only the references of those data records to which the requesting party also has the access rights can be given. Identification of the data is not possible without access rights. Should certain data be accessed, the access rights may be verified before data access is permitted.
Abstract: A vegetation care vessel for facilitating the care of plants and other vegetation. A hollow body includes a top portion, a planar bottom portion and a continuous wall portion. A spout communicates with the interior of the hollow body. An inwardly-projecting region is provided in the wall for receiving a dispenser having a compressor-spout. An aperture is arranged in the top portion of the body for admitting liquid from the compressor-spout into the interior of the hollow body.
Abstract: Apparatus for remotely controlling the positioner of a camera head. At least one hydraulically-actuated positioner for rotating the camera head with respect to an axis is fixed to the camera head and to a camera support device, such as a camera boom. The positioner includes an output shaft whose angular displacement is responsive to fluid flows transmitted through a pair of associated hydraulic lines. A valve is associated with each positioner and controls the flow of fluid within the pair of positioner hydraulic lines. A control unit receives and processes inputs provided by a camera operator (observing the camera's field-of-view on a monitor) and outputs generated by the system so that the necessary adjustments may be controlled by the valves to assume smooth camera movements in either an aquatic environment or otherwise.
Abstract: An antirotation device for preventing undesired rotation of a barrel in which a viscous fluid is being mixed or stirred. The device includes a subsstantially-planar member of generally-rectangular shape. An internal aperture is provided for accommodating a barrel. A clip is provided at the end of a chain that is engaged to a minor side of the substantially-planar member for grasping the brim of the barrel and elevating that side while anti-skid tape is fixed to the substantially-planar member adjacent the other minor side to provide a region onto which the worker may step firmly and securely and thereby effectively apply force for counteracting the torque applied to the barrel by the stirred or mixed viscous fluid. In an alternative embodiment, a rigid elongated strip that includes a hooked end is flexibly engaged to the substantially-planar member by means of a ring in the place of the chain and clip of the other embodiment.
Abstract: The present invention to a system for positioning staff in an office, which comprises a plurality of fixed identification reader devices, a plurality of identification devices and a host computer. Each staff carries the identification device. The identification reader devices are places at fixed points of the terminal of the system to record and identify staff near the terminal. The host computer is used for collecting and recording the information read by the reader devices. Thereby, the system for position staff in an office according to the present invention could manage the staff in an office efficiently.
Abstract: A cue for table games includes a laminated shaft. The shaft includes a central elongated member of square cross-section and a plurality of surrounding elongated members. The elongated members are joined one another by adhesive. The laminated fabrication effectively eliminates warping while the central elongated member preserves the feel of a non-laminated shaft.
Abstract: A method for producing a silicon torsion spring capable, for example, of reading the rotation rate in a microstructured torsion spring/mass system. The system that is produced achieves a low torsional stiffness compared to a relatively high transverse stiffness in the lateral and vertical directions. The method proceeds from a wafer or wafer composite and, upon suitable mask coverage, a spring with a V-shaped cross section is formed by anisotropic wet-chemical etching which preferably extends over the entire wafer thickness and is laterally delimited only by  planes. Two of the wafers or wafer composites prepared in this way are rotated through 180° and joined to one another oriented mirrorsymmetrically with respect to one another, so that overall the desired X-shaped cross section is formed.
July 20, 2000
Date of Patent:
March 8, 2005
Maik Wiemer, Karla Hiller, Detlef Billep, Uwe Breng, Bruno Rvrko, Eberhard Handrich