Wireless System for Temperature Measurement in Wheels, based on the ISM Band

Nowadays the temperature of bearings in high speed trains is determining their speed. It is necessary to know the value of this variable in each moment, in order to be able to prevent possible failures. Traditional solutions use wired systems which are quite reliable but very expensive. This paper describes a new way of carrying out this measurement using a wireless technology system based on the "Industrial, Scientific and Medical" (ISM) band, becoming a safe and cheap solution. It describes how this wireless sensor measures and transmits information, as well as the laboratory tests carried out to obtain proper performance in an industrial environment. Although only the temperature sensor is presented in this paper, the system can be expanded to include the measurement of many other variables.