| Self-powered sensors are highly sought for wireless applications in space exploration,industries,environmental monitoring,etc.However,most current selfpowered sensor technologies are based on the multiple energy conversion routines:energy collection,rectification,energy storage,and power management before it can be used for sensor systems,leading to exceptionally low energy utilization efficiency and very short periods of wireless sensing operation with the majority of information lost.Here,we propose a triboelectric nanogenerator(TENG)based fully self-powered instantaneous and real-time wireless sensor system which does not contain electronic devices and microchips,but the passive components only.The main research of this work is as follows.(1)Based on the theoretical foundation,a fully self-powered wireless sensing system based on TENG is established.The system converts the TENG output signal into an LC resonant signal with attenuation by integrating an LC parallel resonant circuit that uses a capacitor as a sensor,and its sensing information is contained in the frequency of this signal.And this signal can be transmitted wirelessly through the coil in real-time,with a maximum transmission distance of up to 1.5m with a 15 cm diameter coil.(2)In this work,we have developed a detailed theoretical model for the system and compared the results of the theoretical calculations with the experimental results,and the results of both are in good agreement.With the support of a strong force theory model,the influence of each factor on the system can be better investigated.This makes the system widely applicable.(3)We have used the system model to develop two types of wireless passive sensing systems: a humidity sensing system and a liquid level sensing system,which can monitor ambient humidity and liquid level height,respectively.A detailed characterization of these two sensors was carried out. |
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