Pub Date : 2015-04-13DOI: 10.1109/SAS.2015.7133639
E. Fumagalli, R. Ferretti, M. Bibuli, E. Zereik, M. Caccia, G. Bruzzone
Acoustic technology is one of the most effective tool in investigating seabed characteristics because of the sound property to propagate for long distance in the water. For this reason analysis of acoustic spectra of seafloor is suitable to identify many physical aspects such as reflectivity, absorption coefficient, etc. connected to different kind of seabed. With this purpose, the work presented wants to show preliminary results in analysis of seabed acoustic profiles performed with echosounding technique. In particular we propose results obtained during surveys in Biograd Na Moru (Croatia), in which raw acoustic data of the seafloor are collected by a double frequency echosounder. The very preliminary analysis shows differences in echoes shapes connected to the presence of different features of seabed (sand, rocks, seagrass). The aim of the work is to investigate if there is the possibility to use acoustic features of seabed to build a classification method in order to recognize different aspects of seafloor and its composition.
声学技术由于其在水中长距离传播的特性而成为研究海底特征最有效的工具之一。因此，对海底声谱的分析适合于识别与不同类型海底相关的许多物理方面，如反射率、吸收系数等。为此目的，提出的工作希望显示用回声探测技术进行海底声学剖面分析的初步结果。我们特别提出了在Biograd Na Moru(克罗地亚)调查期间获得的结果，其中海底的原始声学数据是由双频回声测深仪收集的。非常初步的分析表明，回声形状的差异与海底不同特征(沙子、岩石、海草)的存在有关。本研究的目的是探讨是否有可能利用海底声学特征建立一种分类方法，以识别海底及其组成的不同方面。
{"title":"Preliminary results for hydrographic seabed analysis with acoustic devices","authors":"E. Fumagalli, R. Ferretti, M. Bibuli, E. Zereik, M. Caccia, G. Bruzzone","doi":"10.1109/SAS.2015.7133639","DOIUrl":"https://doi.org/10.1109/SAS.2015.7133639","url":null,"abstract":"Acoustic technology is one of the most effective tool in investigating seabed characteristics because of the sound property to propagate for long distance in the water. For this reason analysis of acoustic spectra of seafloor is suitable to identify many physical aspects such as reflectivity, absorption coefficient, etc. connected to different kind of seabed. With this purpose, the work presented wants to show preliminary results in analysis of seabed acoustic profiles performed with echosounding technique. In particular we propose results obtained during surveys in Biograd Na Moru (Croatia), in which raw acoustic data of the seafloor are collected by a double frequency echosounder. The very preliminary analysis shows differences in echoes shapes connected to the presence of different features of seabed (sand, rocks, seagrass). The aim of the work is to investigate if there is the possibility to use acoustic features of seabed to build a classification method in order to recognize different aspects of seafloor and its composition.","PeriodicalId":384041,"journal":{"name":"2015 IEEE Sensors Applications Symposium (SAS)","volume":"42 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2015-04-13","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"127909409","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 : 2015-04-13DOI: 10.1109/SAS.2015.7133638
V. Djapic, Wenjie Dong, A. Bulsara, G. Anderson
This work combines magnetic field sensing and underwater navigation without the need of a priori maps. The initial work utilizes distributed cooperative localization and control used estimate the states of nodes (autonomous underwater vehicles - AUVs) that carry magnetic sensors. Because of their size, weight, power consumption, and cost fluxgate magnetometers are considered. The distributed estimation method and formation control algorithms allow for the creation of various shapes (vertical, horizontal, and longitudinal) of gradiometer sensor using multiple gliders/AUVs that each carry magnetometers as opposed to traditionally considered arrays on a single AUV. This procedure can be applied in Mine Countermeasures (MCM) - military or unexploded ordnances (UXO) both to detect / localize the anomalies (mines) or cable and pipeline survey - civilian, thus serving as a “payload” sensor. At the same time, the same anomailes can be used as features for navigation corrections.
{"title":"Challenges in underwater navigation: Exploring magnetic sensors anomaly sensing and navigation","authors":"V. Djapic, Wenjie Dong, A. Bulsara, G. Anderson","doi":"10.1109/SAS.2015.7133638","DOIUrl":"https://doi.org/10.1109/SAS.2015.7133638","url":null,"abstract":"This work combines magnetic field sensing and underwater navigation without the need of a priori maps. The initial work utilizes distributed cooperative localization and control used estimate the states of nodes (autonomous underwater vehicles - AUVs) that carry magnetic sensors. Because of their size, weight, power consumption, and cost fluxgate magnetometers are considered. The distributed estimation method and formation control algorithms allow for the creation of various shapes (vertical, horizontal, and longitudinal) of gradiometer sensor using multiple gliders/AUVs that each carry magnetometers as opposed to traditionally considered arrays on a single AUV. This procedure can be applied in Mine Countermeasures (MCM) - military or unexploded ordnances (UXO) both to detect / localize the anomalies (mines) or cable and pipeline survey - civilian, thus serving as a “payload” sensor. At the same time, the same anomailes can be used as features for navigation corrections.","PeriodicalId":384041,"journal":{"name":"2015 IEEE Sensors Applications Symposium (SAS)","volume":"56 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2015-04-13","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"132044084","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 : 2015-04-13DOI: 10.1109/SAS.2015.7133593
M. Rivers, N. Coles, Huma Zia, N. Harris, R. Yates
Irrigated agriculture provides 40% of the World's food from 20% of the agricultural land but uses 70% of all global freshwater withdrawals. However, even supposedly efficient and well-managed irrigation systems waste up to 50% of the water applied to the crops under them. Meeting the food needs of an increasing world population from a static or even decreasing land base will, therefore require improved efficiencies in irrigated agriculture and better use of these finite water resources. The first part of this paper reports on a field-based research project which examined a suite of conventional and alternative irrigation systems which were installed at a farm in south west Australia and assessed and compared in terms of their Water Use Efficiency. All “alternative” systems outperformed the conventional surface (flood) irrigation systems with comparative water savings of around 50%. The second part of the paper assesses the potential Water Use Efficiency improvements at farm and system-scales which could be achieved through linking these irrigation systems to wireless soil-moisture sensor networks which are being developed by the authors and which are reported in detail in associate papers. Improving irrigation scheduling and management by better (and, where appropriate, automatic) links to near real-time soil moisture data is shown to produce water savings of up to 30 GL per year at the irrigation system scale.
{"title":"How could sensor networks help with agricultural water management issues? Optimizing irrigation scheduling through networked soil-moisture sensors","authors":"M. Rivers, N. Coles, Huma Zia, N. Harris, R. Yates","doi":"10.1109/SAS.2015.7133593","DOIUrl":"https://doi.org/10.1109/SAS.2015.7133593","url":null,"abstract":"Irrigated agriculture provides 40% of the World's food from 20% of the agricultural land but uses 70% of all global freshwater withdrawals. However, even supposedly efficient and well-managed irrigation systems waste up to 50% of the water applied to the crops under them. Meeting the food needs of an increasing world population from a static or even decreasing land base will, therefore require improved efficiencies in irrigated agriculture and better use of these finite water resources. The first part of this paper reports on a field-based research project which examined a suite of conventional and alternative irrigation systems which were installed at a farm in south west Australia and assessed and compared in terms of their Water Use Efficiency. All “alternative” systems outperformed the conventional surface (flood) irrigation systems with comparative water savings of around 50%. The second part of the paper assesses the potential Water Use Efficiency improvements at farm and system-scales which could be achieved through linking these irrigation systems to wireless soil-moisture sensor networks which are being developed by the authors and which are reported in detail in associate papers. Improving irrigation scheduling and management by better (and, where appropriate, automatic) links to near real-time soil moisture data is shown to produce water savings of up to 30 GL per year at the irrigation system scale.","PeriodicalId":384041,"journal":{"name":"2015 IEEE Sensors Applications Symposium (SAS)","volume":"145 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2015-04-13","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"132151350","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 : 2015-04-13DOI: 10.1109/SAS.2015.7133626
Tuan Anh Nguyen Gia, A. Rahmani, Tomi Westerlund, P. Liljeberg, H. Tenhunen
A novel Internet of Things based architecture supporting scalability and fault tolerance for healthcare is presented in this paper. The wireless system is constructed on top of 6LoWPAN energy efficient communication infrastructure to maximize the operation time. Fault tolerance is achieved via backup routing between nodes and advanced service mechanisms to maintain connectivity in case of failing connections between system nodes. The presented fault tolerance approach covers many fault situations such as malfunction of sink node hardware and traffic bottleneck at a node due to a high receiving data rate. A method for extending the number of medical sensing nodes at a single gateway is presented. A complete system architecture providing a quantity of features from bio-signal acquisition such as Electrocardiogram (ECG), Electroencephalography (EEG), and Electromyography (EMG) to the representation of graphical waveforms of these gathered bio-signals for remote real-time monitoring is proposed.
{"title":"Fault tolerant and scalable IoT-based architecture for health monitoring","authors":"Tuan Anh Nguyen Gia, A. Rahmani, Tomi Westerlund, P. Liljeberg, H. Tenhunen","doi":"10.1109/SAS.2015.7133626","DOIUrl":"https://doi.org/10.1109/SAS.2015.7133626","url":null,"abstract":"A novel Internet of Things based architecture supporting scalability and fault tolerance for healthcare is presented in this paper. The wireless system is constructed on top of 6LoWPAN energy efficient communication infrastructure to maximize the operation time. Fault tolerance is achieved via backup routing between nodes and advanced service mechanisms to maintain connectivity in case of failing connections between system nodes. The presented fault tolerance approach covers many fault situations such as malfunction of sink node hardware and traffic bottleneck at a node due to a high receiving data rate. A method for extending the number of medical sensing nodes at a single gateway is presented. A complete system architecture providing a quantity of features from bio-signal acquisition such as Electrocardiogram (ECG), Electroencephalography (EEG), and Electromyography (EMG) to the representation of graphical waveforms of these gathered bio-signals for remote real-time monitoring is proposed.","PeriodicalId":384041,"journal":{"name":"2015 IEEE Sensors Applications Symposium (SAS)","volume":"157 ","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2015-04-13","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"113986095","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 : 2015-04-13DOI: 10.1109/SAS.2015.7133588
B. Grieve, S. Hammersley, Anne-Katrin Mahlein, E. Oerke, H. Goldbach
Close proximity hyperspectral and multispectral imaging of crops and soils offers significant potential to optimize sustainable intensification of arable produce and seeds breeding, through the real-time precision management of plant pathogens, viruses and pests and the non-destructive high throughput screening for beneficial crop traits. These opportunities have been recently reported and are the subject of ongoing R&D within industry and academia. The broad uptake of the technology by large commercial end-users, through integration with in-field and glasshouse machinery, is limited by cost and equipment reliability. It is further restricted by spectral and spatial resolution, power budget and size, when extending its applicability to consumer markets and small-holder farmers. This study verifies, for the first time, that multispectral sensor systems architectures, exploiting proprietary narrowband LEDs and silicon C-MOS imaging detectors, are capable of substituting for conventional and more expensive line-scanning hyperspectral imaging systems when operated in close proximity (c. 1-2m) of a crop canopy. This was achieved by comparing the data from a prototype version of the new LED-sensor system versus a reference laboratory hyperspectral imaging unit, which was previously developed for crop phenotyping, and the early detection of two fungal pathogen borne diseases in whole barley and sugar beet plants. The choice of crops and diseases replicates earlier studies, with the reference hyperspectral unit, and serves to demonstrate the generic applicability of the new LED-sensor system to cereal and tuber classes of crops. The results indicate that the new approach can deliver data of comparable quality to that of the reference system, for in-field duties, and offers the opportunity for higher sensitivity and spatial resolution. Future potential to apply the new multispectral, LED-based system within commercial products is then discussed.
{"title":"Localized multispectral crop imaging sensors: Engineering & validation of a cost effective plant stress and disease sensor","authors":"B. Grieve, S. Hammersley, Anne-Katrin Mahlein, E. Oerke, H. Goldbach","doi":"10.1109/SAS.2015.7133588","DOIUrl":"https://doi.org/10.1109/SAS.2015.7133588","url":null,"abstract":"Close proximity hyperspectral and multispectral imaging of crops and soils offers significant potential to optimize sustainable intensification of arable produce and seeds breeding, through the real-time precision management of plant pathogens, viruses and pests and the non-destructive high throughput screening for beneficial crop traits. These opportunities have been recently reported and are the subject of ongoing R&D within industry and academia. The broad uptake of the technology by large commercial end-users, through integration with in-field and glasshouse machinery, is limited by cost and equipment reliability. It is further restricted by spectral and spatial resolution, power budget and size, when extending its applicability to consumer markets and small-holder farmers. This study verifies, for the first time, that multispectral sensor systems architectures, exploiting proprietary narrowband LEDs and silicon C-MOS imaging detectors, are capable of substituting for conventional and more expensive line-scanning hyperspectral imaging systems when operated in close proximity (c. 1-2m) of a crop canopy. This was achieved by comparing the data from a prototype version of the new LED-sensor system versus a reference laboratory hyperspectral imaging unit, which was previously developed for crop phenotyping, and the early detection of two fungal pathogen borne diseases in whole barley and sugar beet plants. The choice of crops and diseases replicates earlier studies, with the reference hyperspectral unit, and serves to demonstrate the generic applicability of the new LED-sensor system to cereal and tuber classes of crops. The results indicate that the new approach can deliver data of comparable quality to that of the reference system, for in-field duties, and offers the opportunity for higher sensitivity and spatial resolution. Future potential to apply the new multispectral, LED-based system within commercial products is then discussed.","PeriodicalId":384041,"journal":{"name":"2015 IEEE Sensors Applications Symposium (SAS)","volume":"6 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2015-04-13","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"121067973","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 : 2015-04-13DOI: 10.1109/SAS.2015.7133654
A. Alfadhel, J. Kosel
A force sensor system consisting of bioinspired, magnetic and highly elastic micropillars integrated on a magnetic field sensing element is reported. The micro-pillars are made of a nanocomposite consisting of magnetic nanowires incorporated into polydimethylsiloxane. The permanent magnetic behavior of the nanowires allows remote operation without an additional magnetic field to magnetize the nanowires, which simplifies miniaturization and system integration. We demonstrate the potential of this concept by realizing a tactile sensing element. The developed sensor element operates at power consumption of 75 μW and has a detection range between 0-120 kPa and a resolution of 2.7 kPa, which can easily be tuned in a wide range.
{"title":"Magnetic micropillar sensors for force sensing","authors":"A. Alfadhel, J. Kosel","doi":"10.1109/SAS.2015.7133654","DOIUrl":"https://doi.org/10.1109/SAS.2015.7133654","url":null,"abstract":"A force sensor system consisting of bioinspired, magnetic and highly elastic micropillars integrated on a magnetic field sensing element is reported. The micro-pillars are made of a nanocomposite consisting of magnetic nanowires incorporated into polydimethylsiloxane. The permanent magnetic behavior of the nanowires allows remote operation without an additional magnetic field to magnetize the nanowires, which simplifies miniaturization and system integration. We demonstrate the potential of this concept by realizing a tactile sensing element. The developed sensor element operates at power consumption of 75 μW and has a detection range between 0-120 kPa and a resolution of 2.7 kPa, which can easily be tuned in a wide range.","PeriodicalId":384041,"journal":{"name":"2015 IEEE Sensors Applications Symposium (SAS)","volume":"1 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2015-04-13","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"116230782","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 : 2015-04-13DOI: 10.1109/SAS.2015.7133575
N. Anandan, B. George
A novel capacitive tactile sensor with slip detection capabilities is reported in this paper. The proposed sensor consists of a conductive layer, an insulating layer and a silicone dome structure. This design is easy to construct and can be realized using less expensive components compared to previously reported capacitive tactile sensors. Each sensing unit in the conductive layer consists of four electrodes. Application of external force leads to deformation of silicone layer which leads to change in capacitance of electrodes. This change in capacitance from each electrode to nearby ground surface of the conductive layer is measured to compute the force and detect the slip. The relationship between capacitance and force is modeled using a polynomial function of suitable order which is then used to estimate the force applied. Finite element analysis was used to study the behavior of the proposed sensor. A prototype sensor was fabricated and tested, which was found to detect slip and estimate the force with good accuracy and excellent repeatability. The prototype's characteristics are well in agreement with the simulation results.
{"title":"A novel low-cost capacitive tactile sensor","authors":"N. Anandan, B. George","doi":"10.1109/SAS.2015.7133575","DOIUrl":"https://doi.org/10.1109/SAS.2015.7133575","url":null,"abstract":"A novel capacitive tactile sensor with slip detection capabilities is reported in this paper. The proposed sensor consists of a conductive layer, an insulating layer and a silicone dome structure. This design is easy to construct and can be realized using less expensive components compared to previously reported capacitive tactile sensors. Each sensing unit in the conductive layer consists of four electrodes. Application of external force leads to deformation of silicone layer which leads to change in capacitance of electrodes. This change in capacitance from each electrode to nearby ground surface of the conductive layer is measured to compute the force and detect the slip. The relationship between capacitance and force is modeled using a polynomial function of suitable order which is then used to estimate the force applied. Finite element analysis was used to study the behavior of the proposed sensor. A prototype sensor was fabricated and tested, which was found to detect slip and estimate the force with good accuracy and excellent repeatability. The prototype's characteristics are well in agreement with the simulation results.","PeriodicalId":384041,"journal":{"name":"2015 IEEE Sensors Applications Symposium (SAS)","volume":"1 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2015-04-13","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"115184533","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 : 2015-04-13DOI: 10.1109/SAS.2015.7133565
Xue-Hu Zhang, Daocheng Wu, Xiaoli Xi, Zhongguo Song
A new method is proposed for direct wave and wall clutter suppression in through-wall surveillance using spread spectrum radar. The impacts made by different analog to digital converters (ADC) and noises on the results of this method are analyzed. Synthetic aperture radar (SAR) imaging of stationary targets behind a wall is taken as an example to demonstrate the effectiveness of the method. It is seen that the direct wave and wall clutters can be mitigated significantly and the target information can be enhanced greatly. The clutter suppression method is insensitive to the sampling rate and bit of ADCs, therefore a low-cost ADC could work with no sacrificing on system performance. Numerical results also show that the method could tolerate a noise level as high as 4dB.
{"title":"Suppression of direct wave and wall clutter for through-wall imaging by spread spectrum radar","authors":"Xue-Hu Zhang, Daocheng Wu, Xiaoli Xi, Zhongguo Song","doi":"10.1109/SAS.2015.7133565","DOIUrl":"https://doi.org/10.1109/SAS.2015.7133565","url":null,"abstract":"A new method is proposed for direct wave and wall clutter suppression in through-wall surveillance using spread spectrum radar. The impacts made by different analog to digital converters (ADC) and noises on the results of this method are analyzed. Synthetic aperture radar (SAR) imaging of stationary targets behind a wall is taken as an example to demonstrate the effectiveness of the method. It is seen that the direct wave and wall clutters can be mitigated significantly and the target information can be enhanced greatly. The clutter suppression method is insensitive to the sampling rate and bit of ADCs, therefore a low-cost ADC could work with no sacrificing on system performance. Numerical results also show that the method could tolerate a noise level as high as 4dB.","PeriodicalId":384041,"journal":{"name":"2015 IEEE Sensors Applications Symposium (SAS)","volume":"38 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2015-04-13","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"130061619","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 : 2015-04-13DOI: 10.1109/SAS.2015.7133583
Sebastian Stoecklin, T. Volk, A. Yousaf, J. Albesa, L. Reindl
This paper describes a size and tissue absorption based comprehensive approach to optimize a pair of coils for the purpose of wireless powering of brain implanted sensors. In the first step, the optimum transmission frequency is determined by considering tolerable coil size, power transmission efficiency and tissue absorption effects. After modeling the important quantities at the frequency of interest, a numerical analysis is performed, revealing a set of coils suitable for efficient inductive powering. This numerical analysis was verified by both FEM simulation and concluding measurements. All simulations account for the layered structure of the human head, modeling the dielectric properties with Cole-Cole dispersion effects. Furthermore, a strategy of boosting power transmission efficiency is covered in simulation and measurement, particularly the application of a ferrite shielding to the transmission coil. In consequence, a link efficiency of 80% at a coil separation distance of 5mm and 20% at 20 mm using a 10mm planar receiving coil can be achieved, contributing to a higher integration density of multi-channel brain implanted sensors.
{"title":"Efficient inductive powering of brain implanted sensors","authors":"Sebastian Stoecklin, T. Volk, A. Yousaf, J. Albesa, L. Reindl","doi":"10.1109/SAS.2015.7133583","DOIUrl":"https://doi.org/10.1109/SAS.2015.7133583","url":null,"abstract":"This paper describes a size and tissue absorption based comprehensive approach to optimize a pair of coils for the purpose of wireless powering of brain implanted sensors. In the first step, the optimum transmission frequency is determined by considering tolerable coil size, power transmission efficiency and tissue absorption effects. After modeling the important quantities at the frequency of interest, a numerical analysis is performed, revealing a set of coils suitable for efficient inductive powering. This numerical analysis was verified by both FEM simulation and concluding measurements. All simulations account for the layered structure of the human head, modeling the dielectric properties with Cole-Cole dispersion effects. Furthermore, a strategy of boosting power transmission efficiency is covered in simulation and measurement, particularly the application of a ferrite shielding to the transmission coil. In consequence, a link efficiency of 80% at a coil separation distance of 5mm and 20% at 20 mm using a 10mm planar receiving coil can be achieved, contributing to a higher integration density of multi-channel brain implanted sensors.","PeriodicalId":384041,"journal":{"name":"2015 IEEE Sensors Applications Symposium (SAS)","volume":"43 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2015-04-13","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"122167662","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 : 2015-04-13DOI: 10.1109/SAS.2015.7133644
E. Rendon-Morales, D. Roggen, H. Prance, R. Prance
Dehydration has been associated with several adverse effects on health and well-being such as the progressive reduction in the ability to concentrate as well as the levels of alertness when fluid intake is restricted. Currently, hydration assessment has been performed using various methods ranging from simple clinical procedures to more complex techniques. However, most of these currently used technologies are not accurate and in some cases are extremely invasive. In this paper we propose a new methodology to assess human hydration using Electric Potential Sensing technology. It is based on measuring the electric field generated by the human body. We propose to correlate the electrical activity of the heart with different levels of human hydration. For evaluating this proof of principle the proposed methodology was assessed considering several healthy subjects. The results presented show that it is possible to assess the level of hydration by measuring changes in the electric field generated by the heart using our proposed sensor technology.
{"title":"Towards the correlation between human hydration and the electrical activity of the heart using Electric Potential Sensors","authors":"E. Rendon-Morales, D. Roggen, H. Prance, R. Prance","doi":"10.1109/SAS.2015.7133644","DOIUrl":"https://doi.org/10.1109/SAS.2015.7133644","url":null,"abstract":"Dehydration has been associated with several adverse effects on health and well-being such as the progressive reduction in the ability to concentrate as well as the levels of alertness when fluid intake is restricted. Currently, hydration assessment has been performed using various methods ranging from simple clinical procedures to more complex techniques. However, most of these currently used technologies are not accurate and in some cases are extremely invasive. In this paper we propose a new methodology to assess human hydration using Electric Potential Sensing technology. It is based on measuring the electric field generated by the human body. We propose to correlate the electrical activity of the heart with different levels of human hydration. For evaluating this proof of principle the proposed methodology was assessed considering several healthy subjects. The results presented show that it is possible to assess the level of hydration by measuring changes in the electric field generated by the heart using our proposed sensor technology.","PeriodicalId":384041,"journal":{"name":"2015 IEEE Sensors Applications Symposium (SAS)","volume":"126 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2015-04-13","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"116089418","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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