Autonomous radio sensor points to new applications

A Siemens research team has developed a sensor that remains passive unless an event such as a pressure change occurs, in which case it generates its own power and transmits a signal to a receiver. The next generation of the sensor is expected to measure only 2 × 5mm, and when manufactured in bulk should be a low cost device. Applications are envisaged to remotely controlled light switches and radiator thermometers, home, office and warehouse security, and many other areas. A current project, reported to be making good progress, is to mould the sensors into vehicle tyres to give continuous information on tyre pressure, axle load and other parameters. The sensor, which was developed at the Perlach R&D Centre of Siemens, near Munich, has been nominated for the prestigious German Zukunftspreis (Future Award).