Magic sensor

Magic sensor

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This image is part of the feature Magic Sensors

Credit: VOLKER STEGER/SIEMENS/SCIENCE PHOTO LIBRARY

Caption: Magic sensor on a finger. It is powered solely by the changes in temperature or pressure it measures, requiring no battery. This long-lived autonomous sensor is only active when there is a change to measure. Voltage is generated in pyroelectric materials by changes in temperature, or in piezoelectric materials by changes in pressure. The voltage is converted into a radio signal transmitted by an antenna. This data can be picked up by a receiver up to 20 metres away. The sensor can be used to measure tyre pressure or the temperature of cooking food. It was developed by Siemens, Munich-Perlach, Germany.

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Keywords: autonomous, battery-free, change, electrical engineering, electronic, electronics, finger, germany, munchen-perlach, munich-perlach, physics, piezoelectric, pressure, pyroelectric, radio, research, sensor, siemens, technology, temperature, thermometer

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