The global site of the UK's leading magazine for automation, motion engineering and power transmission
21 August, 2017

Product and Supplier Search

Facebook

Remote sensors need no wires or batteries

01 March, 2000

Remote sensors need no wires or batteries

Siemens researchers have developed a form of remote sensor which needs no wiring or power supply. Instead, the sensor draws its energy from piezoelectric or pyroelectric materials that generate a voltage when they are stressed or undergo a change in temperature.

In the new sensors, which are still at the laboratory stage, these voltages are fed to a spark gap. When the voltage exceeds a threshold value, a discharge occurs across the gap, generating a high-frequency signal from which the sensor draws its energy. This powers the measuring element - a surface acoustic wave (SAW) sensor - which imprints a unique identification code and the measured data on the high-frequency signal. This is then transmitted via an antenna.

The signal can be picked up and decoded by a receiver up to 20m way from the sensor. The developers hope to extend this range to more than 100m. They foresee many applications for the "event driven" sensing technology in industry, commerce and the home.

For example, the sensors could act at light switches, activating a receiver installed in a lamp. Signals from many sensors around a plant or building could be picked up and acted upon by a central receiver. Siemens says that "a significant amount of development work remains to be done" on the new sensors.




Magazine
  • To view a digital copy of the latest issue of Drives & Controls, click here.

    To visit the digital library of past issues, click here

    To subscribe to the magazine, click here

    To see the latest Products & Services Directory, click here

     

Exhibition

Birmingham 2018The next Drives & Controls Exhibition and Conference will take place in Birmingham, UK, from 10-12 April, 2018. For more information on the event, visit the Show Web site

Poll

"Do you think that robots create or destroy jobs?"

Newsletter
Newsletter

Events

Most Read Articles