Goal detector for detection of an object passing a goal plane
First Claim
1. A system comprising a movable object havingsensor means for sensing an electromagnetic field,radio wave emitter means arranged in the movable object, an internal electrical power supply arranged in the movable object to supply power to the radio wave emitter means, andcontrol means for controlling the operation of the radio wave emitter means, the control means being arranged to sample electromagnetic field intensity measured by the sensor means and transmit data relating to the measured field intensity by means of said radio wave emitter means,the system further comprisingstationary exciter means arranged for providing the electromagnetic field measured by said sensor means, the stationary exciter means extending at the periphery of a flat target plane along a horizontal crossbar and vertical side posts of a goal delimiting the flat target plane,stationary receiver means for receiving the radio waves from the radio wave emitter means and provide an output accordingly, anddata processing means to receive and process said output together with a predetermined set of conditions and providing a resulting output if the predetermined set of conditions are fulfilled to determine whether the movable object passes the flat target plane.
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Accused Products
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 (1, 2, 3, 4) 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.
17 Citations
24 Claims
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1. A system comprising a movable object having
sensor means for sensing an electromagnetic field, radio wave emitter means arranged in the movable object, an internal electrical power supply arranged in the movable object to supply power to the radio wave emitter means, and control means for controlling the operation of the radio wave emitter means, the control means being arranged to sample electromagnetic field intensity measured by the sensor means and transmit data relating to the measured field intensity by means of said radio wave emitter means, the system further comprising stationary exciter means arranged for providing the electromagnetic field measured by said sensor means, the stationary exciter means extending at the periphery of a flat target plane along a horizontal crossbar and vertical side posts of a goal delimiting the flat target plane, stationary receiver means for receiving the radio waves from the radio wave emitter means and provide an output accordingly, and data processing means to receive and process said output together with a predetermined set of conditions and providing a resulting output if the predetermined set of conditions are fulfilled to determine whether the movable object passes the flat target plane.
Specification