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US 2008/0252015 A1Published application
Goal Detector for Detection of an Object Passing a Goal Plane
AssigneeGoalref Aps
InventorJorn Eskildsen
Life of this patent
Estimating the term…
Abstract
A system is disclosed for detection of whether a movable object, such as a sports object, e.g. a football or an ice hockey puck, has passed goal plane. It is known to encircle the goal plane with conductors to produce an electromagnetic field to excite signal emitter means in the movable object, alternatively detect the signal emitted by the emitter means. With the present invention these circuits are sectioned into a plurality of separate circuits, which provides an improved spatial resolution of the system in particularly when the movable object is close to the conductors.
Claims28
A system comprising
- a movable object,
- radio wave emitter means arranged in the movable object,
- stationary exciter means arranged for exciting said radio wave emitter means,
- stationary receiver means for receiving the radio waves from the radio wave emitter means and for providing an output accordingly,
- a plurality of substantially closed first antenna circuits arranged along a periphery of a flat target plane, each first antenna circuit comprising two substantially parallel conductors extending substantially parallel to said periphery of the target plane, said parallel conductors being arranged with a mutual distance in the direction perpendicularly to the flat target plane, wherein said plurality of first antenna circuits constitutes one of said stationary exciter means and said stationary receiver means, and
- data processing means to receive and process said output together with a predetermined set of conditions and providing a resulting output if the set of conditions are fulfilled so as to determine whether the movable object passes the flat target plane.
3 more elements
A movable object for use in a system having means for determining whether the movable object passes a flat target plane of the system, the movable object having
- sensor means for sensing an electromagnetic field,
- radio wave emitter means arranged in the movable object,
- memory means, and
- control means for controlling the operation of the memory means and the radio wave emitter means,
- the control means being arranged to sample an electromagnetic field intensity measured by the sensor means with a given sample rate and store all sampled values to the memory means, the control means further being arranged upon activation to retrieve stored sampled values from the memory means and transmit said retrieved values by means of the radio wave emitter means.
2 more elements
A movable object for use in a system having means for determining whether the movable object passes a flat target plane of the system, the movable object having
- a plurality of sensor means for sensing an electromagnetic field,
- radio wave emitter means arranged in the movable object,
- memory means, and
- control means for controlling the operation of the memory means and the radio wave emitter means,
- the control means being arranged to sample an electromagnetic field intensity measured by the sensor means and transmit data relating to the field intensity measured by the individual sensors by means of said radio wave emitter means, wherein the transmitted data allow for a unique identification of which of said plurality of sensor means measured the transmitted data.
2 more elements
A system comprising
- a movable object,
- radio wave emitter means arranged in the movable object,
- stationary receiver means for receiving radio waves from the radio wave emitter means and for providing an output accordingly,
- stationary exciter means arranged for exciting said radio wave emitter means, the exciter means comprising a first antenna circuit and a second antenna circuit arranged along a periphery of a flat target plane, the first antenna circuit and the second antenna circuit comprising two substantially parallel conductors extending substantially parallel to said periphery of the target plane, said parallel conductors being arranged with a mutual distance in a direction perpendicularly to the flat target plane, the exciter means further comprising a current source for driving an operation of the exciter means, the current source having a phase fast phase shifting arrangement, so that the phase of current provided to one of the conductors may be switched between being in counter-phase and in phase with current provided to the other conductor with a switching rate in the range of 200 Hz and 10,000 Hz,
- the system further comprising data processing means to receive and process said output together with a predetermined set of conditions and providing a resulting output if the set of conditions are fulfilled so as to determine whether the movable object passes the flat target plane.
2 more elements
A system comprising
- a movable object,
- radio wave emitter means arranged in the movable object,
- stationary receiver means for receiving radio waves from the radio wave emitter means and for providing an output accordingly,
- stationary exciter means arranged for exciting said radio wave emitter means, the exciter means comprising a first antenna circuit and a second antenna circuit arranged along a periphery of a flat target plane, the first antenna circuit and the second antenna circuit comprising two substantially parallel conductors extending substantially parallel to said periphery of the target plane, said parallel conductors being arranged with a mutual distance in a direction perpendicularly to the flat target plane, the exciter means further comprising a current source for driving an operation of the exciter means, the current source being arranged for providing emitting coils with overlapping currents of different frequencies, so that current at a first frequency for supplying power is in phase at two coils, and so that the electromagnetic fields of this frequency are in constructive interference and current of a second frequency for providing a signal is supplied in counter-phase,
- the system further comprising data processing means to receive and process said output together with a predetermined set of conditions and providing a resulting output if the set of conditions are fulfilled so as to determine whether the movable object passes the flat target plane.
2 more elements
A system comprising
- a movable object,
- radio wave emitter means arranged in the movable object,
- stationary receiver means for receiving radio waves from the radio wave emitter means and for providing an output accordingly,
- stationary exciter means arranged for exciting said radio wave emitter means, the exciter means comprising a first antenna circuit and a second antenna circuit arranged along a periphery of a flat target plane, the first antenna circuit and the second antenna circuit comprising two substantially parallel conductors extending substantially parallel to said periphery of the target plane, said parallel conductors being arranged with a mutual distance in a direction perpendicularly to the flat target plane, the exciter means further comprising a current source for driving an operation of the exciter means, the current source being arranged to provide the parallel conductors with currents of only slightly different frequencies, so that the interference will produce an intensity varying at mid-plane between zero intensity and a maximum intensity with a frequency equal to a difference in frequency between the two currents,
- the system further comprising data processing means to receive and process said output together with a predetermined set of conditions and providing a resulting output if the set of conditions are fulfilled so as to determine whether the movable object passes the flat target plane.
2 more elements
Dependencies are inferred from the claim text.