Velocity measurement system
AssigneeThe United States of America as represented by the Administrator of the National Aeronautics and Space Administration
InventorWalter Haeussermann
Life of this patent
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Abstract
A velocity sensor for sensing the speed of a moving conductive body employing an E-shaped magnetic core having a pair of spaced Hall effect devices positioned on the end of the central core, the ends of all cores being arranged adjacent to the path of the moving conductive body. The difference in output voltage registered by the two Hall effect devices is indicative of the speed of the conductive body.
Claims6
A velocity sensor for measuring the surface speed of a conductive body along a path of movement comprising:
- an E-shaped magnetic core having a central pole and two spaced outer poles, the ends of said poles being configured to be closely spaced from the conductive surface of a moving body the speed of which is to be measured, said poles being positioned, in line, along said path of movement of said body;
- an energizing coil coupled to said central pole;
- first and second Hall effect devices positioned in a spaced relation along said path of movement of said body on the end surface of said central pole of said core, and each said Hall effect device having a bias input and signal output;
- bias means for applying a biasing current to said energizing coil and to the bias input of said Hall effect devices;
- and
- difference means connected to the signal outputs of said Hall effect devices for subtracting the signal outputs and providing a signal indicative of the velocity of a conductive body moving across but spaced from the end surfaces of said poles and said Hall effect devices.
A velocity sensor for measuring the surface speed of a conductive body along a path of movement comprising:
- first and second oppositely positioned E-shaped magnetic cores adapted and positioned to magnetically support a rotating circular body between said cores, and each said core having central and outer spaced poles, all positioned in a line along a path of movement of said body;
- first and second Hall effect devices positioned in a spaced relation on the ends of the central pole of said first magnetic core, and third and fourth Hall effect devices positioned in a spaced relation on the end surface of the central pole of said second magnetic core;
- said first and third Hall effect devices being positioned diametrically opposite on opposite sides of said body, and said second and fourth Hall effect devices being positioned diametrically opposite on opposite sides of said body;
- a first energizing coil coupled to said first magnetic core, and a second energizing coil coupled to said second magnetic core;
- biasing means for applying a biasing current to said Hall effect devices and to said energizing coil;
- and
- indicating means responsive to the output of said Hall effect devices for indicating the velocity of rotation of said body.
Dependencies are inferred from the claim text.