GOAL DETECTOR FOR DETECTION OF AN OBJECT PASSING A GOAL PLANE
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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.
34 Citations
84 Claims
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1-60. -60. (canceled)
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61. 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, 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.
Specification