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A fully printed flexible multidirectional thermal flow sensor
Authors: Barmpakos Dimitris | Moschos Anastasios | Syrový Tomáš | Koutsis Tzoulian | Syrová Lucie | Kaltsas Grigoris
Year: 2020
Type of publication: článek v odborném periodiku
Name of source: Flexible and Printed Electronics
Publisher name: Institute of Physics Publishing Ltd
Place: Bristol
Page from-to: "035005-1"-"035005-9"
Titles:
Language Name Abstract Keywords
cze Plně tištěny senzor pro snímány směru proudění vzduchu Práce popisuje výzkum senzoru pro měření rychlosti a směru proudění vzduchu/plynu. jedná se o plně tištěný senzor zhotovený na PET substrátu. Bylo zjištěno, že vliv velikosti toku na detekci úhlu toku je zanedbatelný. sítotisk; tištěná elektronika; teplotní senzor; flexibilní senzor
eng A fully printed flexible multidirectional thermal flow sensor This work presents the development and evaluation of a fully printed multi-directional thermal flow sensor on PET substrate. The device consists of conductive Ag tracks and printed thermistors based on BaTiO3, activated carbon and a solvent based thermoset polymeric system. Each element presents similar temperature-electrical resistance behavior (in terms of normalized values), thus enabling utilization as sensing and active elements for thermal two-dimensional flow sensing. A custom experimental setup was used for evaluating the device under two modes of operation, namely constant current and constant resistance. It was observed that in the range of 0 to 25 standard liters per second (SLPM) of air flow, constant resistance provided better input dynamic range than constant current (2.75 and 0.12 mW respectively), while constant resistance mode exhibited a sensitivity of approximately two orders of magnitude greater than that of constant current mode. For constant resistance mode, sensitivities of 0.46 mW/SLPM for zero flow and 0.08 mW/SLPM for flow greater than 6 SLPM were extracted, while for constant current mode the corresponding sensitivity values were 0.018 mW/SLPM for zero flow and 0.0036 mW/SLPM for flow greater than 6 SLPM. The device was capable of successfully detecting the flow direction throughout the target flow range. The influence of the flow magnitude on detecting flow angle was found to be negligible. The proposed device can be mounted to various non-planar surfaces, after the necessary re-calibration. It can be mass produced with various printing technologies for applications as a flexible two-dimensional flow sensor with low fabrication cost. screen-printed electronics; thermal sensor; directional flow; flexible device

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