2020
DOI: 10.1109/ted.2019.2951580
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Design Analysis and Human Tests of Foil-Based Wheezing Monitoring System for Asthma Detection

Abstract: We present a flexible acoustic sensor that has been designed to detect wheezing (a common symptom of asthma) while attached to the chest of a human. We adopted a parallel plate capacitive structure using air as the dielectric material. The pressure (acoustic) waves from wheezing vibrate the top diaphragm of the structure, thereby, changing the output capacitance. The sensor is designed such that it resonates in the frequency range of wheezing (100-1000Hz) which presents twofold benefits. The resonance results … Show more

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Cited by 36 publications
(38 citation statements)
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“…[ 31,33,34 ] Nanomaterials such as graphene, [ 34–36 ] nanotubes, [ 32,35 ] nanowires [ 37,38 ] are still being explored for designing highly sensitive flexible electrodes for capacitive pressure sensors, however, their basic physical properties such as surface uniformity and conductivity are limited and lack the physical properties of thin film metallic and polymeric electrodes. [ 39–43 ] Thus, these nanomaterials are usually sandwiched between two thin films when utilized as electrodes. [ 32,34–38 ] B. U. Hwang et al presented a composite electrode based flexible capacitive pressure sensor in which the top electrode is based on PEDOT:PSS/EMIM‐TCB (poly‐(3,4‐ethylene‐dioxy‐thiophene):poly‐(styrene‐sulfonate)/1‐ethyl‐3‐methyl‐imidazolium tetracyano‐borate), which is piezoresistive in nature while GIG [Au‐ITO‐AU] is chosen as bottom electrode.…”
Section: Electrodes For Flexible Capacitive Pressure Sensorsmentioning
confidence: 99%
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“…[ 31,33,34 ] Nanomaterials such as graphene, [ 34–36 ] nanotubes, [ 32,35 ] nanowires [ 37,38 ] are still being explored for designing highly sensitive flexible electrodes for capacitive pressure sensors, however, their basic physical properties such as surface uniformity and conductivity are limited and lack the physical properties of thin film metallic and polymeric electrodes. [ 39–43 ] Thus, these nanomaterials are usually sandwiched between two thin films when utilized as electrodes. [ 32,34–38 ] B. U. Hwang et al presented a composite electrode based flexible capacitive pressure sensor in which the top electrode is based on PEDOT:PSS/EMIM‐TCB (poly‐(3,4‐ethylene‐dioxy‐thiophene):poly‐(styrene‐sulfonate)/1‐ethyl‐3‐methyl‐imidazolium tetracyano‐borate), which is piezoresistive in nature while GIG [Au‐ITO‐AU] is chosen as bottom electrode.…”
Section: Electrodes For Flexible Capacitive Pressure Sensorsmentioning
confidence: 99%
“…[ 40 ] The effect of the aspect ratio on cantilever capacitive pressure sensors is analyzed using metal coated polymer as sensing electrode. [ 39 ] S. M. Khan et al analyzed different diaphragm shapes of the same material for acoustic and air pressure sensing [ 41 ] and asthma monitoring [ 42 ] applications. The top and bottom electrodes are based on graphene while a micro‐structured polydimethylsiloxane (PDMS) film acts as dielectric in the flexible capacitive pressure sensor.…”
Section: Electrodes For Flexible Capacitive Pressure Sensorsmentioning
confidence: 99%
“…Paper, polymer and do-it-yourself (DIY) electronics have been utilized to design low-cost systems and devices for flexible electronics applications such as health monitoring, plant monitoring and environmental monitoring [16][17][18][19][20]. Using paper as part of the sensory element has received significant attention due to its various features such as low cost, environmental friendliness, portability, flexibility and low weight which require only few garage fabrication steps like cutting, folding, bending, sculpting, photo-lithography and printing to design large-area flexible electronic systems [20][21][22][23][24].…”
Section: Introductionmentioning
confidence: 99%
“…Using paper as part of the sensory element has received significant attention due to its various features such as low cost, environmental friendliness, portability, flexibility and low weight which require only few garage fabrication steps like cutting, folding, bending, sculpting, photo-lithography and printing to design large-area flexible electronic systems [20][21][22][23][24]. Fully flexible systems fabricated using paper-based materials have been previously demonstrated for several applications such as health monitoring of body vitals like body temperature, abnormal sweating, heartrate, blood-pressure and wheezing [17][18]. Paper-based electronic devices like smart toy, loudspeaker, cube lamp, flowerpot and architectural model have been designed using paper sculpting methods [21].…”
Section: Introductionmentioning
confidence: 99%
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