Did You Know...
...that the x-ray was discovered purely by accident? When German physicist Wilhelm Konrad von Roentgen was experimenting with cathode rays in 1895, he put an activated Crookes tube in a book and went out to lunch. When he returned, he discovered that a key that had also been placed in the book showed up as an image on the developed film!
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| Number | Title | Issue Date |
| 7161686 | Sensor for determining the angular position of a radiating point source in two dimensions and method of operation A sensor for determining the angular position of a radiating point source in two dimensions includes a mask encoded in two skewed directions with waveforms consisting of several frequencies in prescribed patterns. The frequency spectra of the received detector patte... | 01/09/2007 |
| 6528991 | Magnetic position measurement system with field containment means A magnetic field position and orientation measurement system contains, confines and re-directs the magnetic field from one or more transmitters such that the fields are attenuated in areas outside of the operating volume in areas where metallic objects ar... | 03/04/2003 |
| 6473167 | Position and orientation determination using stationary fan beam sources and rotating mirrors to sweep fan beams Position and orientation determination uses stationary fan beam sources and rotating mirrors to sweep fan beams. In a first embodiment, a single motor has an elongated drive shaft with mirrors mounted on it, the reflective faces of which lie either in com... | 10/29/2002 |
| 6417839 | System for position and orientation determination of a point in space using scanning laser beams A system for position and orientation determination of a point in space employs, in a preferred embodiment, three scanning laser beams that rotate at a high rate of speed within a prescribed space. At least two of the beams are polarized and a sensor with... | 07/09/2002 |
| 6246231 | Magnetic field permeable barrier for magnetic position measurement system A magnetic field position and orientation measurement system contains, confines and re-directs the magnetic field from one or more transmitters such that the fields are attenuated in areas outside of the operating volume in areas where metallic objects ar... | 06/12/2001 |
| 5953683 | Sourceless orientation sensor In a sourceless orientation sensor, the sensor measures the three orientation angles azimuth, elevation and roll in a fixed reference three-dimensional coordinate frame. The sensor utilizes a three-axis magnetic sensor to measure changes in the Earth's ma... | 09/14/1999 |
| 5831260 | Hybrid motion tracker A hybrid motion tracker captures the motion of a person. Magnetic field sensors and optical sources are placed on a person, each located on different limbs. A fixed transmitter emits electromagnetic energy and infrared light is transmitted from the optica... | 11/03/1998 |
| 5767960 | Optical 6D measurement system with three fan-shaped beams rotating around one axis A system for the determination of the distance and orientation of an object carrying at least three light sensors from a fixed reference point when the object is irradiated by at least three modulated scanning beams of known angular orientation, and rotat... | 06/16/1998 |
| 5744953 | Magnetic motion tracker with transmitter placed on tracked object The motion of a person is measured in real time using magnetic fields. A magnetic transmitter and a number of magnetic receivers are placed at different points on the person. The transmitter transmits magnetic fields sequentially from three orthogonal coi... | 04/28/1998 |
| 5742394 | Optical 6D measurement system with two fan shaped beams rotating around one axis A system for the determination of the distance and orientation of an object carrying at least three light sensors from a fixed reference point when the object is irradiated by two modulated scanning beams of known angular orientation and rotational freque... | 04/21/1998 |
| 5600330 | Device for measuring position and orientation using non-dipole magnet IC fields Position and orientation of receiving antennae with respect to magnetic field transmitting antennae are determined. The transmitter consists of two or more antenna whose dimensions are large compared to the distance to the receiver. The receiver consists ... | 02/04/1997 |
| 4849692 | Device for quantitatively measuring the relative position and orientation of two bodies in the presence of metals utilizing direct current magnetic fields A device for quantitatively measuring the relative position and orientation of two bodies in the presence of metals via measuring the position and orientation of receiving antennae with respect to transmitting antennae utilizing direct current electromagn... | 07/18/1989 |
