Device for quantitatively measuring the relative position and orientation of two bodies in the presence of metals utilizing direct current magnetic fields
Patent 4945305 Issued on July 31, 1990. Estimated Expiration Date: 
April 11, 2009. Estimated Expiration Date is calculated based on simple USPTO term provisions. It does not account for terminal disclaimers, term adjustments, failure to pay maintenance fees, or other factors which might affect the term of a patent.
April 11, 2009. Estimated Expiration Date is calculated based on simple USPTO term provisions. It does not account for terminal disclaimers, term adjustments, failure to pay maintenance fees, or other factors which might affect the term of a patent.Patent References 3121228 3133283 Distance-measuring system using orthogonal magnetic field generators and orthogonal magnetic field sensors Three dimensional digitizer with electromagnetic coupling Device for quantitatively measuring the relative position and orientation of two bodies in the presence of metals utilizing direct current magnetic fields Patent #: 4849692 InventorAssigneeApplicationNo. 336342 filed on 04/11/1989US Classes:324/207.17, Separate pick-up324/207.11, Displacement324/207.15, Inductive324/207.26, Approach or retreat342/451By computerExaminersPrimary: Eisenzopf, Reinhard J.Assistant: Snow, Walter E. Attorney, Agent or FirmInternational ClassesG01B 007/14G01S 005/04 AbstractA device for measuring the position (location and orientation), in the six degrees of freedom of receiving antennae (3) with respect to transmitting antennae (2) utilizing pulsed DC magnetic signals. The transmitting and receiving components consist of two or more transmitting antennae of known location and orientation with respect to each other. The transmitting antenna (2) are driven one at a time (or in the case of three or more antennae one or two at a time) by a pulsed, direct current signal. The receiving antennae (3) measure the transmitted direct current magnetic fields and the earth's magnetic field. A computer (5) is used to control the transmitting and receiving elements and to convert the received signals into location and orientation outputs. | |
