Abstract
This experimental study investigates the duty-cycle passive times modifications for a low power wireless sensing system (WSS) designed for energy harvesting technology when its input power level and energy storage size are varying. The different low power WSSs presented in the literature feature specific designs aimed at solving particular problems, and due to their specificity their performance indicators are not directly comparable. As a result of this incompatibility, one cannot identify a correlation between the input power, energy storage element size, passive and active time variations to evaluate the potential usability of the system for static or dynamic testing. The present work covers this result comparison gap induced by the incompatibility factor, providing the experimental data obtained as a result of input power level and energy storage size variation for the same low power WSS, thus generating a reference point for the advanced designer and also for the inexperienced user. The experimental results illustrate that, by varying the storage capacity of a low power WSS, its input power range can be enlarged by up to 20 times.
Highlights
This study focuses on a low power wireless sensing system (WSS) designed to be autonomous using energy harvesting technology and provides an experimental investigation of its performance when modifying its input power level and energy storage capacity
The energy harvester (EH) variation of PIN is derived from the controlled frequency shift and strain deformation on the macro fibre composite (MFC) based EH aluminium substrate plate produced by the user input data in accordance with real flight vibration scenarios [7]
This study has experimentally investigated the duty-cycle passive times modifications for a low power WSS designed for EH technology, and demonstrated that by varying the storage capacity, the WSS input power range can be enlarged by up to 20 times
Summary
This study focuses on a low power WSS designed to be autonomous using energy harvesting technology and provides an experimental investigation of its performance when modifying its input power level and energy storage capacity. As the diagram from figure 1 illustrates, the general structure for all applications designed to be powered by an energy harvester (EH) is similar at the block level, the differentiation being made at the component level, [1]: EH size, shape, material, energy conversion efficiency and excitation (e.g., light, wind speed, vibration, temperature, etc.) determine the electricity input power level provided to the system. The energy storage element, which can be a capacitor, super-capacitor or a rechargeable battery, can vary in size according to its intended functionality: immediate energy transfer to the WSS when there is enough energy available for one functioning duty-cycle, or long term energy storage in order to facilitate a timed complex operation. The wireless sensing system can vary from the low power radio frequency identification (RFID) architecture transmitting on industrial, scientific and medical (ISM) radio bands, to the ones designed for standard communication protocols like IEEE 802.15.4, ZigBee, Bluetooth, etc
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