By producing low magnetic fields around the goals,
GoalRef creates the radio equivalent of a light
curtain. As soon as the ball has wholly crossed the
goal line between the posts, a change in the
magnetic field is detected. A goal alert is then
instantaneously transmitted to the game officials
using an encrypted radio signal, with a message
displayed on their wristwatches. The system uses a
very small and compact electronic device
embedded in the ball manufactured by Select
(Denmark). Fraunhofer IIS has developed the
GoalRef technology in cooperation with the Danish
company and is currently working towards
commercialization.