Pub Date : 2022-10-30DOI: 10.1109/SENSORS52175.2022.9967333
C.‐I. Moon, Jiwon Lee, Seula Kye, Yoosang Baek, Onseok Lee
Psoriasis is a chronic skin disease that has various appearances and severity depending on the patient, and it requires continuous observation of the disease during several months of treatment. It is difficult to track changes in psoriasis severity using a patient's personal device owing to data security issues. Recently, convolutional neural networks (CNN) and federated learning (FL) approaches for data security have shown remarkable performance in vision tasks on medical images. However, in a client environment, disease images acquired from personal devices are unconstrained, and data loss can occur because of various environmental and physical noises. We used masking modeling to overcome data deformation and damage. In addition, we propose a masked attention model to improve the severity classification performance by extracting discriminative severity features from the masked image. As a result, when the masking ratio was set to 0.5, the severity classification of the FL-based masked attention model yielded the best classification performance, with an F1-score of 0.88. Psoriasis severity classification using the proposed method ensured data security and was robustly performed even during data deformation and damage.
{"title":"Federated Learning for Masked Psoriasis Severity Classification","authors":"C.‐I. Moon, Jiwon Lee, Seula Kye, Yoosang Baek, Onseok Lee","doi":"10.1109/SENSORS52175.2022.9967333","DOIUrl":"https://doi.org/10.1109/SENSORS52175.2022.9967333","url":null,"abstract":"Psoriasis is a chronic skin disease that has various appearances and severity depending on the patient, and it requires continuous observation of the disease during several months of treatment. It is difficult to track changes in psoriasis severity using a patient's personal device owing to data security issues. Recently, convolutional neural networks (CNN) and federated learning (FL) approaches for data security have shown remarkable performance in vision tasks on medical images. However, in a client environment, disease images acquired from personal devices are unconstrained, and data loss can occur because of various environmental and physical noises. We used masking modeling to overcome data deformation and damage. In addition, we propose a masked attention model to improve the severity classification performance by extracting discriminative severity features from the masked image. As a result, when the masking ratio was set to 0.5, the severity classification of the FL-based masked attention model yielded the best classification performance, with an F1-score of 0.88. Psoriasis severity classification using the proposed method ensured data security and was robustly performed even during data deformation and damage.","PeriodicalId":120357,"journal":{"name":"2022 IEEE Sensors","volume":"261 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2022-10-30","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"115594554","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2022-10-30DOI: 10.1109/SENSORS52175.2022.9967248
Akihiro Koyama, Y. Sugita, A. Isobe, Yudai Kamada, M. Degawa, Toshiyuki Mine, T. Kawamoto
Leakage detection using integrated wireless vibration sensors has been minimizing labor in water pipe networks. Specifically, vibration sensors with a built-in low-noise micro-electro-mechanical systems (MEMS) accelerometer can detect leakage-induced acoustic waves at long ranges. Automatic sensor placement optimization provides sufficient coverage and minimizes the required number of sensors. This can save weeks of manual labor selecting the installation positions of 1,000 or more sensors in a city-scale pipe network. However, the detection distance of a vibration sensor varies based on the piping conditions around the sensor installation position, often causing mismatching between estimated and actual coverage. Therefore, we propose a novel sensor placement optimization method that utilizes the acoustic attenuation features of water piping structures. We successfully utilize it with a city-scale pipe network and optimize placement of 2,997 sensors in one day. We achieve coverage of over 95% regardless of the piping conditions, indicating our method would be sufficient for practical use.
{"title":"Leakage Sensor Placement Optimization Using Acoustic Attenuation Features in Water Mains","authors":"Akihiro Koyama, Y. Sugita, A. Isobe, Yudai Kamada, M. Degawa, Toshiyuki Mine, T. Kawamoto","doi":"10.1109/SENSORS52175.2022.9967248","DOIUrl":"https://doi.org/10.1109/SENSORS52175.2022.9967248","url":null,"abstract":"Leakage detection using integrated wireless vibration sensors has been minimizing labor in water pipe networks. Specifically, vibration sensors with a built-in low-noise micro-electro-mechanical systems (MEMS) accelerometer can detect leakage-induced acoustic waves at long ranges. Automatic sensor placement optimization provides sufficient coverage and minimizes the required number of sensors. This can save weeks of manual labor selecting the installation positions of 1,000 or more sensors in a city-scale pipe network. However, the detection distance of a vibration sensor varies based on the piping conditions around the sensor installation position, often causing mismatching between estimated and actual coverage. Therefore, we propose a novel sensor placement optimization method that utilizes the acoustic attenuation features of water piping structures. We successfully utilize it with a city-scale pipe network and optimize placement of 2,997 sensors in one day. We achieve coverage of over 95% regardless of the piping conditions, indicating our method would be sufficient for practical use.","PeriodicalId":120357,"journal":{"name":"2022 IEEE Sensors","volume":"44 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2022-10-30","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"122785415","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2022-10-30DOI: 10.1109/SENSORS52175.2022.9967270
Karthik Kakaraparty, Gretchen S. Hyer, Erik A. Pineda, R. Reid, I. Mahbub
In this paper, theoretical modeling and experimental validation of REWOD energy harvesting based on flexible electrodes for self-powered sensor applications have been investigated. Much of REWOD's research has focused on planar electrodes that have an inflexible, rigid surface and use high bias voltages to increase output power, which undermines the goals of self-powered wearable motion sensors. This article implements REWOD-based energy harvesting using two dissimilar flexible electrodes. Electron beam physical vapor deposition (EBPVD) is used to coat the material onto a polyimide film. A comparative analysis between theoretical model data and experimental measurement data has been conducted.
{"title":"Theoretical Modeling and Experimental Validation of Reverse Electrowetting on Dielectric (REWOD) Through Flexible Electrodes For Self-Powered Sensor Applications","authors":"Karthik Kakaraparty, Gretchen S. Hyer, Erik A. Pineda, R. Reid, I. Mahbub","doi":"10.1109/SENSORS52175.2022.9967270","DOIUrl":"https://doi.org/10.1109/SENSORS52175.2022.9967270","url":null,"abstract":"In this paper, theoretical modeling and experimental validation of REWOD energy harvesting based on flexible electrodes for self-powered sensor applications have been investigated. Much of REWOD's research has focused on planar electrodes that have an inflexible, rigid surface and use high bias voltages to increase output power, which undermines the goals of self-powered wearable motion sensors. This article implements REWOD-based energy harvesting using two dissimilar flexible electrodes. Electron beam physical vapor deposition (EBPVD) is used to coat the material onto a polyimide film. A comparative analysis between theoretical model data and experimental measurement data has been conducted.","PeriodicalId":120357,"journal":{"name":"2022 IEEE Sensors","volume":"24 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2022-10-30","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"114505861","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2022-10-30DOI: 10.1109/SENSORS52175.2022.9967236
Christy She, J. Wyatt, Rujuta Munje, Pavani Tenneti, Alex Thompson
For relative humidity sensors the sensing element needs to be in direct contact with environmental moisture to allow transmission of moisture into the sensing material. Thus, an open cavity package is required for relative humidity sensors. As a result, the sensing material is always exposed to the external environment for the lifetime of the device. The sensing material may get exposed to environmental factors such as chemicals, dust, as well as extreme temperature and humidity conditions which may increase the error in accuracy beyond the datasheet specifications. This paper demonstrates a novel technique of offset error correction as well as different industrial packaging practices to mitigate the shift in accuracy of the device. This facilitates maintaining device accuracy for an extended lifetime which eliminates the need for system recalibration by end users saving cost and time.
{"title":"How to Maintain Accuracy of Open Cavity Polymer Based Relative Humidity Sensors","authors":"Christy She, J. Wyatt, Rujuta Munje, Pavani Tenneti, Alex Thompson","doi":"10.1109/SENSORS52175.2022.9967236","DOIUrl":"https://doi.org/10.1109/SENSORS52175.2022.9967236","url":null,"abstract":"For relative humidity sensors the sensing element needs to be in direct contact with environmental moisture to allow transmission of moisture into the sensing material. Thus, an open cavity package is required for relative humidity sensors. As a result, the sensing material is always exposed to the external environment for the lifetime of the device. The sensing material may get exposed to environmental factors such as chemicals, dust, as well as extreme temperature and humidity conditions which may increase the error in accuracy beyond the datasheet specifications. This paper demonstrates a novel technique of offset error correction as well as different industrial packaging practices to mitigate the shift in accuracy of the device. This facilitates maintaining device accuracy for an extended lifetime which eliminates the need for system recalibration by end users saving cost and time.","PeriodicalId":120357,"journal":{"name":"2022 IEEE Sensors","volume":"61 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2022-10-30","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"122222117","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2022-10-30DOI: 10.1109/SENSORS52175.2022.9967057
Keli Zhao, Yuhui Zhang, Guangyao Pei, Jian Luo, B. Ma
Amorphous Terfenol-D $(text{Tb}_{0.3} text{Dy}_{0.7} text{Fe}_{2})$ film with high magnetization in weak fields is essential to weak magnetic sensors. The influences of a constant 100 Oe magnetic field parallel to the film plane during the deposition are studied. Then the film was annealed at different temperatures to discuss the effects of annealing on the magnetization of Terfenol-D film. The magnetization of Terfenol-D film could be enhanced by incremental saturation magnetization and decreased effective anisotropy constant. The magnetization at 100 Oe of 0.47 emu/g was obtained with the annealing at 600°C for 10 minutes.
{"title":"Effects of the Bias Magnetic Field and Annealing on the Magnetization of Terfenol-D Films","authors":"Keli Zhao, Yuhui Zhang, Guangyao Pei, Jian Luo, B. Ma","doi":"10.1109/SENSORS52175.2022.9967057","DOIUrl":"https://doi.org/10.1109/SENSORS52175.2022.9967057","url":null,"abstract":"Amorphous Terfenol-D $(text{Tb}_{0.3} text{Dy}_{0.7} text{Fe}_{2})$ film with high magnetization in weak fields is essential to weak magnetic sensors. The influences of a constant 100 Oe magnetic field parallel to the film plane during the deposition are studied. Then the film was annealed at different temperatures to discuss the effects of annealing on the magnetization of Terfenol-D film. The magnetization of Terfenol-D film could be enhanced by incremental saturation magnetization and decreased effective anisotropy constant. The magnetization at 100 Oe of 0.47 emu/g was obtained with the annealing at 600°C for 10 minutes.","PeriodicalId":120357,"journal":{"name":"2022 IEEE Sensors","volume":"1 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2022-10-30","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"116733143","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2022-10-30DOI: 10.1109/SENSORS52175.2022.9967331
Martin D. Dimitrievski, D. V. Hamme, Wilfried Philips
This paper proposes a novel sensor fusion method capable of detection and tracking of road users under nominal as well as in border cases of system operation. The proposed method is based on a sensor-agnostic Bayesian late fusion framework, augmented with an optional exchange of detector activation information between sensors, referred to as cooperative feedback. Experimental evaluation confirms that we obtain competitive detection and tracking performance in normal operation. The main benefit of the proposed method is in cases of sensor failure where, due to the probabilistic modeling, we observed significant improvements of both detection and tracking accuracy over the state of the art.
{"title":"Perception System based on Cooperative Fusion of Lidar and Cameras","authors":"Martin D. Dimitrievski, D. V. Hamme, Wilfried Philips","doi":"10.1109/SENSORS52175.2022.9967331","DOIUrl":"https://doi.org/10.1109/SENSORS52175.2022.9967331","url":null,"abstract":"This paper proposes a novel sensor fusion method capable of detection and tracking of road users under nominal as well as in border cases of system operation. The proposed method is based on a sensor-agnostic Bayesian late fusion framework, augmented with an optional exchange of detector activation information between sensors, referred to as cooperative feedback. Experimental evaluation confirms that we obtain competitive detection and tracking performance in normal operation. The main benefit of the proposed method is in cases of sensor failure where, due to the probabilistic modeling, we observed significant improvements of both detection and tracking accuracy over the state of the art.","PeriodicalId":120357,"journal":{"name":"2022 IEEE Sensors","volume":"4 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2022-10-30","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"116834016","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2022-10-30DOI: 10.1109/SENSORS52175.2022.9967251
Mayu Yoshikawa, Shinichiro Mito, H. Kanasugi
This paper presents a robust, reliable, and compact three-dimensional (3D) environment visualization system that uses ultra-wideband (UWB) position estimation. This method enables quick and effortless spatial environment measurements with low computation costs. The UWB location estimation uses wireless communication to provide high flexibility and accuracy in measurements. We developed a prototype system that combines UWB and environmental sensors to collect temperature, luminance, and location data in a real space. The prototype is compact and collects environmental information efficiently. Furthermore, the spatial distribution of the collected ambient data of an object can be visualized in 3D using it. The results show that the prototype system with UWB is suitable for measuring indoor environmental data.
{"title":"Indoor spatial-environment measurement using ultra-wideband positioning system","authors":"Mayu Yoshikawa, Shinichiro Mito, H. Kanasugi","doi":"10.1109/SENSORS52175.2022.9967251","DOIUrl":"https://doi.org/10.1109/SENSORS52175.2022.9967251","url":null,"abstract":"This paper presents a robust, reliable, and compact three-dimensional (3D) environment visualization system that uses ultra-wideband (UWB) position estimation. This method enables quick and effortless spatial environment measurements with low computation costs. The UWB location estimation uses wireless communication to provide high flexibility and accuracy in measurements. We developed a prototype system that combines UWB and environmental sensors to collect temperature, luminance, and location data in a real space. The prototype is compact and collects environmental information efficiently. Furthermore, the spatial distribution of the collected ambient data of an object can be visualized in 3D using it. The results show that the prototype system with UWB is suitable for measuring indoor environmental data.","PeriodicalId":120357,"journal":{"name":"2022 IEEE Sensors","volume":"1 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2022-10-30","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"128538481","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2022-10-30DOI: 10.1109/SENSORS52175.2022.9967229
M. L. Haider, Danyah Nashawi, Ziyu Chen, Mohammad Salman Parvez, A. S. Sanchez, Teresa Le, R. Prisby, J. Lee
Osteoporosis is a major health care concern. In addition to medication, mechanical loading (e.g., exercise) can augment bone mass to alleviate or delay osteoporosis. Reports in the literature indicate that the stimuli initiating bone remodeling with mechanical loading are fluctuations in intramedullary pressure and interstitial fluid flow. Methodologies designed to altered intramedullary pressure and fluid flow involve infection susceptible and external oscillatory equipment. We report preliminary data indicating enhanced bone formation in rat femora by use of polydimethylsiloxane (PDMS) based pressure modulating micropump, which alters intramedullary pressure. These pressure alterations are sensed and recorded via a wireless pressure sensor system for real-time measurement of bone intrameduallry pressure. With only 10 minutes of pressure fluctuation and 7 days of recovery, new bone volume formation in the rats tended (p=0.09) to be higher in femora receiving pressure modulation vs. the contralateral control bone. These results suggest that our system may be efficacious in augmenting bone mass.
{"title":"A Study of Bone Formation Subsequent to Intramedullary Fluid Pressure Fluctuations in Young and Old Rats","authors":"M. L. Haider, Danyah Nashawi, Ziyu Chen, Mohammad Salman Parvez, A. S. Sanchez, Teresa Le, R. Prisby, J. Lee","doi":"10.1109/SENSORS52175.2022.9967229","DOIUrl":"https://doi.org/10.1109/SENSORS52175.2022.9967229","url":null,"abstract":"Osteoporosis is a major health care concern. In addition to medication, mechanical loading (e.g., exercise) can augment bone mass to alleviate or delay osteoporosis. Reports in the literature indicate that the stimuli initiating bone remodeling with mechanical loading are fluctuations in intramedullary pressure and interstitial fluid flow. Methodologies designed to altered intramedullary pressure and fluid flow involve infection susceptible and external oscillatory equipment. We report preliminary data indicating enhanced bone formation in rat femora by use of polydimethylsiloxane (PDMS) based pressure modulating micropump, which alters intramedullary pressure. These pressure alterations are sensed and recorded via a wireless pressure sensor system for real-time measurement of bone intrameduallry pressure. With only 10 minutes of pressure fluctuation and 7 days of recovery, new bone volume formation in the rats tended (p=0.09) to be higher in femora receiving pressure modulation vs. the contralateral control bone. These results suggest that our system may be efficacious in augmenting bone mass.","PeriodicalId":120357,"journal":{"name":"2022 IEEE Sensors","volume":"72 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2022-10-30","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"128249614","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2022-10-30DOI: 10.1109/SENSORS52175.2022.9967262
Debarun Sengupta, Srikanth Birudula, H. Wörtche, A. Kottapalli
This work reports the fabrication of a titanium carbide nanoparticle-based inkjet printed flexible bidirectional flow sensor. The design of the flow sensor consists of an inkjet printed titanium carbide piezoresistive strain gauge on a polyester cantilever. The sensors demonstrated a normalized flow sensitivity of 1.043/(ms-1) in the velocity range ~ 0.15 - 0.55 m/s (for water flow). The fabrication method reported in this work potentially opens a new direction for fabrication of a class of robust, repeatable, and inexpensive flexible flow sensors.
{"title":"An Inkjet-Printed Piezoresistive Bidirectional Flow Sensor","authors":"Debarun Sengupta, Srikanth Birudula, H. Wörtche, A. Kottapalli","doi":"10.1109/SENSORS52175.2022.9967262","DOIUrl":"https://doi.org/10.1109/SENSORS52175.2022.9967262","url":null,"abstract":"This work reports the fabrication of a titanium carbide nanoparticle-based inkjet printed flexible bidirectional flow sensor. The design of the flow sensor consists of an inkjet printed titanium carbide piezoresistive strain gauge on a polyester cantilever. The sensors demonstrated a normalized flow sensitivity of 1.043/(ms-1) in the velocity range ~ 0.15 - 0.55 m/s (for water flow). The fabrication method reported in this work potentially opens a new direction for fabrication of a class of robust, repeatable, and inexpensive flexible flow sensors.","PeriodicalId":120357,"journal":{"name":"2022 IEEE Sensors","volume":"36 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2022-10-30","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"124589704","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2022-10-30DOI: 10.1109/SENSORS52175.2022.9967003
Ryo Takamatsu, Shogo Amano, S. Izumi, Hiroshi Ohta, T. Nezu, Yuki Noda, T. Araki, T. Uemura, T. Sekitani, H. Kawaguchi
In recent years, the increase in the number of heat stroke patients has become a social problem. Heat stroke occurs indoors at home in many cases. This paper focuses on the measurement of sweat rate using a wearable device to prevent heat stroke in the indoor environment. In the proposed method, textile-based electrodes impregnated in fiber materials are used to measure the impedance of the skin. As sweating lowers the impedance of the skin, the amount of sweating can be estimated from the impedance change between the electrodes. However, the method using impedance has a problem in distinguishing the effects of water volume and salinity. To address this problem, dual-frequency impedance measurement is proposed in this paper. The proposed method utilizes the fact that impedance variations due to water volume and salinity changes have different frequency characteristics. The measurement results indicate that the proposed method can measure impedance while considering changes in the water volume and salinity.
{"title":"Wearable Perspiration Volume Sensor Using Dual-Frequency Impedance Measurement","authors":"Ryo Takamatsu, Shogo Amano, S. Izumi, Hiroshi Ohta, T. Nezu, Yuki Noda, T. Araki, T. Uemura, T. Sekitani, H. Kawaguchi","doi":"10.1109/SENSORS52175.2022.9967003","DOIUrl":"https://doi.org/10.1109/SENSORS52175.2022.9967003","url":null,"abstract":"In recent years, the increase in the number of heat stroke patients has become a social problem. Heat stroke occurs indoors at home in many cases. This paper focuses on the measurement of sweat rate using a wearable device to prevent heat stroke in the indoor environment. In the proposed method, textile-based electrodes impregnated in fiber materials are used to measure the impedance of the skin. As sweating lowers the impedance of the skin, the amount of sweating can be estimated from the impedance change between the electrodes. However, the method using impedance has a problem in distinguishing the effects of water volume and salinity. To address this problem, dual-frequency impedance measurement is proposed in this paper. The proposed method utilizes the fact that impedance variations due to water volume and salinity changes have different frequency characteristics. The measurement results indicate that the proposed method can measure impedance while considering changes in the water volume and salinity.","PeriodicalId":120357,"journal":{"name":"2022 IEEE Sensors","volume":"15 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2022-10-30","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"129487825","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
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