Systems and methods useful for detecting presence and/or location of various materials
AssigneeAdmiralty Corporation
InventorJames Wagner Larsen
Life of this patent
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Abstract
The present invention provides systems and methods which can be employed to locate or detect presence of various materials, including nonferrous metals. These systems include new and useful sensors, circuits, systems and devices which power and/or interoperate with the sensors, and methods of making, operating and using such systems. Any or all of the systems, devices or processes can be combined with other systems, devices or processes disclosed.
Claims7
Apparatus for sensing and providing information relating to position of and material forming an object, the apparatus comprising:
- a. at least one emitter, the emitter adapted to emit a plurality of primary electromagnetic fields, at least some fields varying in time relative to other of the fields,
- b. a plurality of sensors, the sensors adapted to sense amplitude and gradients in secondary electromagnetic fields, the secondary electromagnetic fields produced by the object responsive to the primary electromagnetic fields, and to sense difference in phases between at least one of the secondary electromagnetic fields and its corresponding primary electromagnetic field;
- c. said sensors coupled to processing circuitry, the processing circuitry adapted to use said secondary field amplitude, gradient and phase difference information in order to provide information relating to material forming the object and position of the object relative to at least one of the sensors, and
- d. wherein at least one of said sensors is positioned relative to said emitter whereby the field quantity of at least one field emitted by the emitter at the position of said at least one sensor, in the direction sensed by said at least one sensor, is near zero.
A method for sensing and providing information relating to position of and material forming an object, the method comprising:
- a. emitting a plurality of primary electromagnetic fields, at least some fields varying in time relative to other of the fields;
- b. positioning a plurality of sensors relative to said plurality of primary electromagnetic fields, including positioning at least one of said sensors relative to at least one of the primary electromagnetic fields such that the field quantity of said at least one field, in the direction sensed by said at least one sensor, is near zero;
- c. sensing, using at least some of said sensors, amplitude and gradients in secondary electromagnetic fields, the secondary electromagnetic fields produced by the object responsive to the primary electromagnetic fields;
- d. sensing, using at least some of said sensors, differences in phases between at least one of the secondary electromagnetic fields and its corresponding primary electromagnetic field;
- and
- e. providing relating to material forming the object and position object relative to at least one of the sensors, using processing circuitry coupled to said sensors, the processing circuitry adapted to use said secondary field amplitude, gradient and phase difference information in order to generate said information.
Dependencies are inferred from the claim text.