Respiration Monitoring Using a Flexible Paper-Based Capacitive Sensor

Malik, Shahid; Ahmad, Meraj; Punjiya, Meera; Sadeqi, Aydin; Baghini, Maryam Shojaei; Sonkusale, Sameer

doi:10.1109/icsens.2018.8589558

Cited by 26 publications

(13 citation statements)

References 11 publications

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“…An example would be the capacitive sensing of humidity, where the porous paper serves as a dielectric material. When the paper absorbs humidity from its environment, the dielectric constant of the capacitor alters accordingly, and those changes can be measured [12][13][14][15]. Additionally, wireless readout-options for such sensors have frequently been reported [16][17][18] paving the way for truly low-cost, sustainable and smart packaging solutions of the future [19,20].…”

Section: Introductionmentioning

confidence: 99%

Evaluation of the Sheet Resistance of Inkjet-Printed Ag-Layers on Flexible, Uncoated Paper Substrates Using Van-der-Pauw’s Method

Zikulnig

Roshanghias

Rauter

et al. 2020

Sensors

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With the growing significance of printed sensors on the electronics market, new demands on quality and reproducibility have arisen. While most printing processes on standard substrates (e.g., Polyethylene terephthalate (PET)) are well-defined, the printing on substrates with rather porous, fibrous and rough surfaces (e.g., uncoated paper) contains new challenges. Especially in the case of inkjet-printing and other deposition techniques that require low-viscous nanoparticle inks the solvents and deposition materials might be absorbed, inhibiting the formation of homogeneous conductive layers. As part of this work, the sheet resistance of sintered inkjet-printed conductive silver (Ag-) nanoparticle cross structures on two different, commercially available, uncoated paper substrates using Van-der-Pauw's method is evaluated. The results are compared to the conductivity of well-studied, white heat stabilised and treated PET foil. While the sheet resistance on PET substrate is highly reproducible and the variations are solely process-dependent, the sheet resistance on uncoated paper depends more on the substrate properties themselves. The results indicate that the achievable conductivity as well as the reproducibility decrease with increasing substrate porosity and fibrousness.

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Section: Introductionmentioning

confidence: 99%

Evaluation of the Sheet Resistance of Inkjet-Printed Ag-Layers on Flexible, Uncoated Paper Substrates Using Van-der-Pauw’s Method

Zikulnig

Roshanghias

Rauter

et al. 2020

Sensors

View full text Add to dashboard Cite

show abstract

“…For the environmental category, modulation of cardiac activity was also very common [ 5 , 7 , 50 , 52 , 54 , 163 , 164 , 168 , 174 , 175 , 177 , 178 , 189 , 190 , 196 , 197 , 198 , 199 , 205 , 206 , 207 , 213 , 214 , 219 , 221 , 223 , 224 , 225 , 226 , 229 , 232 , 233 ]. Meanwhile, air temperature and air humidity were the second [ 2 , 64 , 91 , 104 , 107 , 116 , 120 , 128 , 133 , 145 , 153 , 154 , 155 , 156 , 162 ] and third [ 66 , 74 , 75 , 80 , 82 ,…”

Section: Resultsmentioning

confidence: 99%

“…Nose or mouth were also widely used locations to place the sensors. As a particular case of sensors placed in the nose or mouth, several researchers integrated them into a mask [ 66 , 75 , 80 , 82 , 92 , 101 , 107 , 137 , 156 ]. This contrasts with locations, like fingers, waist, arms, or wrists, in which use was residual [ 93 , 115 , 117 , 118 , 126 , 139 , 157 ].…”

Section: Resultsmentioning

confidence: 99%

Sensing Systems for Respiration Monitoring: A Technical Systematic Review

Vanegas

Igual

Plaza

2020

Sensors

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Respiratory monitoring is essential in sleep studies, sport training, patient monitoring, or health at work, among other applications. This paper presents a comprehensive systematic review of respiration sensing systems. After several systematic searches in scientific repositories, the 198 most relevant papers in this field were analyzed in detail. Different items were examined: sensing technique and sensor, respiration parameter, sensor location and size, general system setup, communication protocol, processing station, energy autonomy and power consumption, sensor validation, processing algorithm, performance evaluation, and analysis software. As a result, several trends and the remaining research challenges of respiration sensors were identified. Long-term evaluations and usability tests should be performed. Researchers designed custom experiments to validate the sensing systems, making it difficult to compare results. Therefore, another challenge is to have a common validation framework to fairly compare sensor performance. The implementation of energy-saving strategies, the incorporation of energy harvesting techniques, the calculation of volume parameters of breathing, or the effective integration of respiration sensors into clothing are other remaining research efforts. Addressing these and other challenges outlined in the paper is a required step to obtain a feasible, robust, affordable, and unobtrusive respiration sensing system.

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“…Since the air exhaled has higher humidity than the air inhaled, breathing rate monitoring could be done using a humidity sensor placed close to the patient’s nose or mouth. Various humidity sensors could be adopted including resistive sensors [35] , capacitive sensors [36] , nanocrystal and nanoparticles sensors [37] – [39] , fiber optic sensors [40] , [41] , and impedance sensors [42] . These different types of humidity sensors have been reviewed and their specifications were compared in [43] .…”

Section: Contact Respiratory Monitoring Techniquesmentioning

confidence: 99%

Contact and Remote Breathing Rate Monitoring Techniques: A Review

et al. 2021

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Breathing rate monitoring is a must for hospitalized patients with the current coronavirus disease 2019 (COVID-19). We review in this paper recent implementations of breathing monitoring techniques, where both contact and remote approaches are presented. It is known that with non-contact monitoring, the patient is not tied to an instrument, which improves patients' comfort and enhances the accuracy of extracted breathing activity, since the distress generated by a contact device is avoided. Remote breathing monitoring allows screening people infected with COVID-19 by detecting abnormal respiratory patterns. However, non-contact methods show some disadvantages such as the higher set-up complexity compared to contact ones. On the other hand, many reported contact methods are mainly implemented using discrete components. While, numerous integrated solutions have been reported for non-contact techniques, such as continuous wave (CW) Doppler radar and ultrawideband (UWB) pulsed radar. These radar chips are discussed and their measured performances are summarized and compared. Index Terms-Chronic obstructive pulmonary diseases (COPD), COVID-19, breathing monitoring techniques, Doppler radar, ultra-wideband (UWB) pulse radar. I. INTRODUCTIONT TE main function of the respiratory system is gas exchange. Oxygen is transferred from the external ambient into our bloodstream, while carbon dioxide is expelled outside [1]. Fig. 1 illustrates the respiratory system including the upper and lower respiratory tract regions. When inhaling, the air flow passes through the larynx and the trachea, and then splits into two bronchi. Each bronchus is divided into two Manuscript

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Respiration Monitoring Using a Flexible Paper-Based Capacitive Sensor

Cited by 26 publications

References 11 publications

Evaluation of the Sheet Resistance of Inkjet-Printed Ag-Layers on Flexible, Uncoated Paper Substrates Using Van-der-Pauw’s Method

Evaluation of the Sheet Resistance of Inkjet-Printed Ag-Layers on Flexible, Uncoated Paper Substrates Using Van-der-Pauw’s Method

Sensing Systems for Respiration Monitoring: A Technical Systematic Review

Contact and Remote Breathing Rate Monitoring Techniques: A Review

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