Ambient electromagnetic energy harvesting system for on-body sensors

Ambient electromagnetic energy harvesting system for on-body sensors

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An ambient electromagnetic energy harvesting system for on-body sensors is presented. Specifically, a smart contact lens that monitors the glucose level in the tear fluid of a user is demonstrated. The energy harvesting system rectifies a portion of a cell phone/smartphone-emitted uplink signal into DC power for the operations of on-lens sensors and components. An actual cow eye is used to assist in various measurements of the proposed energy harvester. Ultimately, a power of 1 mW at about 1 V is harvested and delivered to a resistive load of 2 KΩ when a cell phone is held in a typical reading position. This harvested power level is more than adequate to enable numerous possible on-body sensors.


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