RFID transponder timing
Originally this system was created to replace barcodes to identify objects quickly. Then with the emergence of mass run (marathon and others), it is used to identify people.
Two types of transponders exist on the market , passive and active transponder.
- Passive transponders are powered by the electromagnetic field of the antenna. The cost is low, they are often used only once.
- Active transponders have a battery which allows better detection performance. The cost is more.
These systems are generally used for marathon races with the installation of several antennas at the finish, in order to obtain the least possible collisions and to approach a reliability of 100% (difficult to reach). Because of its wide detection, it can not be used for precise timing.