Patent ID: 7671736
Filing Date: 2010-03-02
Classification: G01D,H02J

Abstract:
1. A wireless system comprising: a unit which travels back and forth over a path during operation; and a first antenna having an elongated shape and which lies adjacent to and along the path over which the unit travels during operation, wherein the unit comprises: a second antenna; an electrical energy storage unit connected to the second antenna, wherein during operation the energy storage unit receives energy via electromagnetic coupling of the second antenna with an RF field produced by the first antenna, at least a part of the received energy being stored in the energy storage unit; and an electronics system connected to the energy storage unit and which during operation is powered solely by the received energy stored in the energy storage unit, the electronics system including a sensor, a processor configured to acquire data from the sensor, and a transmitter coupled to the processor and to the second antenna, wherein the energy storage unit is capable of storing sufficient energy received from the RF field produced by the first antenna to enable the transmitter to transmit a message wirelessly via the second antenna, the message containing data acquired by the processor from the sensor.