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MEMS-BASED BATTERY-LESS RFID INFRARED SENSOR TAG WITH MEMORY FUNCTION
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DOI：10.1109/memsys.2019.8870752.png)
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Abstract
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In this paper we demonstrate for the first time, a battery-less radio frequency identification (RFID) infrared (IR) sensor tag capable of detecting and recording the presence of a specific IR signature associated with an event of interest. Unlike existing passive sensor tags that can only perform sensing and recording functions when wirelessly powered by a reader, the proposed IR sensor tag uses a zero-power latching micromechanical photoswitch (MP) to continuously monitor the environment and record an event occurrence without requiring any electrical power. The MP's contacts are engineered to remain latched by adhesion forces after the device is exposed to above-threshold IR irradiation, thereby forming a physical memory bit (open/closed). An integrated auto-reset functionality is also implemented to unlatch and erase the memory bit after every reading. The prototype reported here represents the first demonstration of a battery-less RFID sensor tag suitable for long-term, continuous monitoring for IR signatures indicative of failure events (e.g. overheating/fires in power infrastructure).
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