Graphene inductor harvests power-line radiation to run a battery-free temperature sensor
Researchers at the University of Arkansas and the University of Michigan have developed a graphene-based energy harvester that draws power from the magnetic field around an electrical power line to run a low-power temperature sensor.
The team made graphene inductors in two forms, a flat spiral and a three-dimensional helix, and measured the voltage and current induced in them by a nearby power cable. A single graphene inductor with an inner steel core produced enough voltage to drive a Cockcroft-Walton circuit, which rectifies the signal and multiplies its voltage. The circuit charged three storage capacitors to the levels needed to operate a custom low-power temperature sensor, replacing the usual power-management chip and rechargeable battery. That lowered the sensor’s power consumption and extended its projected service life.
Source: https://www.graphene-info.com/graphene-inductor-harvests-power-line-radiation-run-battery-free-temperature
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