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Device for measuring the location, the attitude and/or the change in location or, respectively, attitude of a rigid body in space

  • US 4,197,855 A
  • Filed: 03/17/1978
  • Issued: 04/15/1980
  • Est. Priority Date: 04/04/1977
  • Status: Expired due to Term
First Claim
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1. A system for measuring and registering information with respect to location and attitude of a rigid body in space, said system comprising a field generator arranged in fixed relation to the body, flux responsive means for mounting independently of the field generator and at an interval therefrom, and for supplying electrical signals in accordance with field flux from the field generator to represent positional information with respect to the body, and an electronic unit coupled with said flux reponsive means for obtaining and evaluating the electrical signals from the flux responsive means, characterized in said field generator being constructed such that it produces a defined irregular field, and said flux responsive means comprising at least one first surface, said first surface having a plurality of sensor elements, at least a part of which are arranged to form first sensor lines running parallel to each other, the sensor elements of the respective first sensor lines providing respective outputs and such respective outputs being electrically differentially coupled together for supplying a first differential signal, and comprising at least one second surface disposed between the field generator and the first surface, and parallel to the first surface to form a pair therewith and at an interval therefrom, the second surface having a plurality of second sensor lines comprising series of sensor elements extending parallel to respective sensor lines of the first surface, with the sensor elements of the respective second sensor lines of the second surface providing respective outputs and such outputs being electrically differentially coupled together for supplying a second differential signal, and said electronic device having means for differentially combining the first and second differential signals with respect to the first and second surfaces of said pair, said field generator comprising means for producing a magnetic field of irregular field configuration such that the output from said last mentioned means is responsive to relative rotation of said field generator while being relatively insensitive to translational components of movement of the field generator over a range of movement to be measured.

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