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A method of swing on a swing is disclosed, in which a user positioned on a standard swing suspended by two chains from a substantially horizontal tree branch induces side to side motion by pulling alternately on one chain and then the other.
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| Number | Title | Issue Date |
| 6853179 | Angle sensor for measuring magnetic field strength An arrangement is provided for measuring the field strength of a magnetic field, or measuring field, by an angle sensor. The angle sensor is aligned with the field lines of the measuring field at the position of the field strength of the measuring field, or measurin... | 02/08/2005 |
| 6756779 | Inductive measuring transducer for determining the relative position of a body An inductive measuring transducer having bodies movable relative to one another, one of the bodies being a sensor component including an inductive sensor that produces an alternating magnetic field. Another of the bodies is a pickup component including an inductive ... | 06/29/2004 |
| 6753680 | Position sensor A position sensor for sensing linear or radial position, including at least four magnets, a first ferrous plate having at least two of the at least four magnets located at spaced locations along the first ferrous plate, the at least two magnets being oriented such t... | 06/22/2004 |
| 6744943 | Add-drop filter utilizing chiral elements An add-drop filter, utilizing chiral elements, that enables a new signal to be added at a particular vacuum wavelength λ′k to a fiber optic line carrying n signal channels over a band of wavelengths encompassing λ1 . . . λk−1,... | 06/01/2004 |
| 6741762 | Back biased electro-optical modulator An electro-optical modulator and a method for biasing a Mach-Zehnder modulator. The inventive modulator includes a layer of material at least partially transparent to electromagnetic energy. A first conductive layer is disposed on a first surface of the layer of at ... | 05/25/2004 |
| 6734666 | Method of determining the angular position of a permanent magnet rotor of a polyphase electric motor This method consists in supplying at least a first alternating signal, at a determined frequency, to one end of a stator coil and recuperating a measurement signal at a second end of said coil, said measurement signal being provided to electronic processing means, w... | 05/11/2004 |
| 6731109 | Magnetic position sensor having a stepped magnet interface A non-contacting magnetic position sensor that produces a magnetic field having improved linear characteristics over an extended sensing range. The magnetic position sensor includes a pair of magnets, a pair of pole pieces extending between the magnets and spaced ap... | 05/04/2004 |
| 6731110 | Magneto-resistive device with built-in test structure and method for determining resistance and track width A magneto-resistive device with built-in test structure. The magneto-resistive device includes a slider having first and second lower termination pads and first and second upper termination pads. A first conductive trace element electrically couples the first lower ... | 05/04/2004 |
| 6727695 | Test method and apparatus for noncontact and nondestructive recognition of irregularities in the wall thickness of ferromagnetic pipes An electric current comprising a plurality of harmonic components is passed through the pipe under test, a magnetic field produced by it outside the pipe is measured, a spectrum of the electric current is measured, a spectrum from measured magnetic field data is als... | 04/27/2004 |
| 6727686 | Method and device for detecting incorrect polarity in a signal transducer formed as an inductive sensor A method and a device for detecting mispolarization in a signal transducer is described, with which the output signal of the signal transducer—that has at least one singularity—is converted into a square-wave signal. Intervals between specifiable signal-level ch... | 04/27/2004 |
| 6724187 | Methods for eliminating error sources of magnetic sensors used for the measurement of coating thickness A method which compensates errors resulting from offset voltages and external magnetic fields when a magnetic sensor is used to measure coating thickness. The method also allows compensation of a temperature dependent change for output voltages of the magnetic senso... | 04/20/2004 |
| 6724963 | Method and apparatus for manufacturing partially diffusing optical fibers The present invention provides for an apparatus and method to manufacture optical fiber in a way that produces controlled and patterned diffusion of optical radiation along its length. The novelty of the described invention is that the patterns of diffusion are prod... | 04/20/2004 |
| 6720760 | Induced current position transducers having improved scale loop structures A scale loop formed by a loop trace of electrically conductive material is usable in an induced current position transducer. The scale loop is continuous and has a particular shape depending on the configuration of the induced current position transducer. The scale ... | 04/13/2004 |
| 6720764 | Magnetic sensor system useful for detecting tool joints in a downhole tubing string A method and apparatus for detecting ferrous changes passing axially through a cylindrical space. In one embodiment, the method comprises surrounding the cylindrical space with a nonmagnetic cylinder having an outer wall and a cylindrical axis; creating an alternati... | 04/13/2004 |
| 6711327 | Device and method for compensating for chromatic dispersion A device and method for compensating for chromatic dispersion in an optical signal. The optical signal is coupled between an optical waveguide of a type having (i) a fundamental-mode waveguide and (ii) a higher-order mode waveguide surrounding the fundamental-mode w... | 03/23/2004 |
| 6710591 | Method and system for measuring anchoring strength of liquid crystal by measuring magnetic field induced torque A method and system for measuring anchoring strength of liquid crystal through measurement of magnetic field induced torque. In the system for measuring anchoring strength of liquid crystal, when a magnetic field (7) is applied to a liquid crystal cell (1 | 03/23/2004 |
| 6703635 | Method and apparatus for measuring the level of liquid using optical fiber strain gauge For measurement of a liquid level, an optical fiber connected at its one end portion to force receiving means movably arranged in liquid to receive force from the liquid is dipped in the liquid together with the force receiving means, and a change in the ... | 03/09/2004 |
| 6703830 | Tunable magnetic device for use in a proximity sensor A tunable magnetic device which includes a permanent magnet in the shape of a ring, an inner aperture, a tuning member, and a field sensor secured to the permanent magnet. The tuning member may be a ferrous or magnetic material and may be secured to a non... | 03/09/2004 |
| 6696682 | Optical signal active tracking using tunable FBG A method and apparatus for processing an optical signal in an optical waveguide using a closed loop wavelength dependent active tuning system. A tunable fiber Bragg grating, optical processor and a controller provide feedback control of the central wavele... | 02/24/2004 |
| 6696832 | Method and apparatus for testing transducer heads in magnetic storage systems An apparatus and associated testing method for identifying void heads in magnetic storage systems in which a first bit error rate is determined using data written at a first overshoot amount. A second bit error rate is determined using data written at a s... | 02/24/2004 |
| 6693272 | Light path deviation detecting apparatus and confocal microscope A light path deviation detecting apparatus has a diverging element for diverging a detection target light path into two light paths, and detects light receiving position on light receiving surfaces disposed spaced light path lengths different from each ot... | 02/17/2004 |
| 6693425 | Sensor having an electric coil and giant magnetoresistor for detecting defects in a component A sensor for detecting defects in a component includes an electric coil fed with a varying electrical current to create a varying magnetic field penetrating at least partly into the component under test, and a defect detector including a magnetoresistor. ... | 02/17/2004 |
| 6690164 | Perpendicular detection fluxgate micromagnetometer and method for the production thereof A fluxgate micro-magnetometer with perpendicular detection and a process of realization thereof. A ferromagnetic core is perpendicular to a substrate. The axes of excitation coils and pick-up coils are also perpendicular to the substrate. A magnetic field... | 02/10/2004 |
| 6690169 | Interference cancelling metal detector including electronic selection of effective sensing coil arrangement Metal detection apparatus containing at least two inductive coils one of which acts as a transmit coil and all of which act as receive coils and processing circuitry wherein a proportion of the first receive electronic signal and a proportion of the secon... | 02/10/2004 |
| 6686742 | Ground mineralization rejecting metal detector (power saving) A metal detector apparatus including a transmit coil which transmits a magnetic field, transmit timing control circuitry which also includes timing for a semiconductor switch, and receive signal circuitry and receive signal processing circuitry, with a tr... | 02/03/2004 |
| 6683447 | Electro-optic apparatus for measuring signal potentials An electro-optic sampling apparatus is provided to enable measurement on potentials of signals on the conductor of coaxial cable with high precision and with ease. Herein, an electric input connector inputs a measured electric signal, which is introduced ... | 01/27/2004 |
| 6680609 | Method and apparatus for determining the magnetic track width of a magnetic head A method of determining a magnetic track width of a magnetic head. The method begins by obtaining a full track profile of the magnetic head which includes a plurality of signal amplitudes read across a track of a magnetic disk at a plurality of magnetic h... | 01/20/2004 |
| 6672175 | Apparatus and method for sensing an angle of relative rotation of rotors A rotation sensor provided with a first rotor fixed to a shaft, a second rotor fixed to the same or other shaft and adjoining the first rotor, and a core having a resonance coil, arranged around the first rotor, and which coil forms a magnetic circuit wor... | 01/06/2004 |
| 6670809 | Magnetic sensor with modulating flux concentrator having minimized air resistance for 1/f noise reduction A magnetic sensing transducer device that senses low frequency magnetic fields by using flux concentrators that modulate the observed low frequency signal, thereby shifting this observed signal to higher frequencies and minimizing 1/f-type noise. This is ... | 12/30/2003 |
| 6670805 | Displacement sensor containing magnetic field sensing element between a pair of biased magnets movable as a unit A displacement sensor for providing an indication of the position of a first body relative to a second body, the first body being displaceable relative to the second body in a displacement direction. The sensor is composed of: two magnets that are spaced ... | 12/30/2003 |
| 6670806 | Magnetic position sensor for measuring linear displacement The invention relates to a device with a magnetic position sensor comprising a field sensor (5) and analysis electronics (7) for linear displacements of a rod-shaped component (3), in particular the shaft of an actuator, with an element (M) generating a m... | 12/30/2003 |
| 6664557 | In-situ detection of thin-metal interface using optical interference An invention is disclosed for an optical endpoint detection system that utilizes optical interference to determine when a metal layer has reached a thin metal zone during a CMP process. A portion of a surface of a wafer is illuminated with broad baned lig... | 12/16/2003 |
| 6664788 | Nonlinear electroseismic exploration A method for seismic exploration using nonlinear conversions between electromagnetic and seismic energy, with particular attention to the electromagnetic source waveform used. According to the invention, seismic returns from a source waveform are correlat... | 12/16/2003 |
| 6664783 | System for measuring magnetostriction employing a plurality of external magnetic field rotation harmonics A system for measuring the magnetostriction coefficient λ of a sample material applied to a substrate element fixed at one end leaving the other end free to be deflected. An external rotating magnetic field of rotation frequency f and intensity Hext... | 12/16/2003 |
| 6657430 | Noncontact type magnetic hear wear-rate measuring apparatus A magnetic head wear-rate measuring apparatus for measuring the rate of head wear in noncontact form arranged to be opposed to a magnetic head and to serve as a part of oscillating elements of an oscillator circuit. A magnetic resistance of a magnetic cir... | 12/02/2003 |
| 6657429 | Material condition assessment with spatially periodic field sensors Inductive sensors measure the near surface properties of conducting magnetic materials. The sensors generally include parallel winding segments to induce a spatially periodic magnetic field in a material under test. The sensors may provide a directionally... | 12/02/2003 |
| 6657220 | Disk detecting device used in a disk recording/reproducing system and resultant disk recording/reproducing system For reducing the number of components used and thereby attaining the reduction of cost and size while ensuring the same disk detecting performance as in the prior art, both light emitting function and light receiving function inherent in an optical pickup... | 12/02/2003 |
| 6653837 | Dipole field locate point determination using a horizontal flux vector A system includes a boring tool that is moved through the ground while transmitting a dipole locating signal such that the locating signal exhibits a pair of locate points at the surface of the ground. A local flux intensity of the locating signal is meas... | 11/25/2003 |
| 6653838 | Ground mineralization rejecting metal detector (transmit signal) A metal detector with a transmit coil which transmits a magnetic field, transmit timing control circuitry, and receive signal circuitry and receive signal processing circuitry, and a low voltage and a high voltage power supply. The timing sequence generat... | 11/25/2003 |
| 6650113 | Detector and method thereof for determining magnetic flux based on electromotive force induced by an excitation current A magnetic flux detector has a core member and an armature member. The core member generates a magnetic flux by an exciting coil receiving an excitation current controlled by an excitation current controller. The magnetic flux detector also has a search c... | 11/18/2003 |
