Flexible Pressure Sensors: Modeling and Experimental Characterization

Sepúlveda, A. T.; Villoria, Roberto Guzmán de; Viana, J. C.; Pontes, A. J.; Wardle, Brian L.; Rocha, Licinio

doi:10.1016/j.proeng.2012.09.361

Cited by 16 publications

(11 citation statements)

References 5 publications

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“…Although the blood pressure in the aneurysm sac ranges from 100 to 130 kPa, the pressure sensors were only tested for pressures between 0 and 100 kPa due to technological constraints. The sensor's response fits very well with that predicted by the analytic model [17] and shows relatively good linearity, especially in the region close to the sensor's reference-atmospheric pressure.…”

Section: B Pressure Sensorssupporting

confidence: 54%

Implantable Flexible Pressure Measurement System Based on Inductive Coupling

Oliveira

Sepúlveda

Almeida

et al. 2015

IEEE Trans. Biomed. Eng.

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One of the currently available treatments for aortic aneurysms is endovascular aneurysm repair (EVAR). In spite of major advances in the operating techniques, complications still occur and lifelong surveillance is recommended. In order to reduce and even eliminate the commonly used surveillance imaging exams, as well as to reduce follow-up costs, new technological solutions are being pursued. In this paper, we describe the development, including design and performance characterization, of a flexible remote pressure measurement system based on inductive-coupling for post-EVAR monitoring purposes. The telemetry system architecture and operation are described and main performance characteristics discussed. The implantable sensor details are provided and its model is presented. Simulations with the reading circuit and the sensor's model were performed and compared with measurements carried out with air and a phantom as media, in order to characterize the telemetry system and validate the models. The transfer characteristic curve (pressure versus frequency) of the monitoring system was obtained with measurements performed with the sensor inside a controlled pressure vacuum chamber. Additional experimental results which proof the system functionality were obtained within a hydraulic test bench that emulates the aorta. Several innovative aspects, when compared to the state of the art, both in the sensor and in the telemetry system were achieved.

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Section: B Pressure Sensorssupporting

confidence: 54%

Implantable Flexible Pressure Measurement System Based on Inductive Coupling

Oliveira

Sepúlveda

Almeida

et al. 2015

IEEE Trans. Biomed. Eng.

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“…However, being specialised medical devices, these instruments are very expensive and can only be used in a medical setting under the guidance of a trained medical attendant [ 17 ]. As a result, initiatives to develop a low-cost and reliable pressure monitoring device for medical applications are in progress [ 18 , 19 , 20 , 21 , 22 , 23 ]. In addition, research is required to simplify this pressure measurement process in compression therapy and provide flexibility to users/patients so they can self-administer bandages/hosiery.…”

Section: Introductionmentioning

confidence: 99%

Evaluation of Flexible Force Sensors for Pressure Monitoring in Treatment of Chronic Venous Disorders

Parmar

Khodasevych

Troynikov

2017

Sensors

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The recent use of graduated compression therapy for treatment of chronic venous disorders such as leg ulcers and oedema has led to considerable research interest in flexible and low-cost force sensors. Properly applied low pressure during compression therapy can substantially improve the treatment of chronic venous disorders. However, achievement of the recommended low pressure levels and its accurate determination in real-life conditions is still a challenge. Several thin and flexible force sensors, which can also function as pressure sensors, are commercially available, but their real-life sensing performance has not been evaluated. Moreover, no researchers have reported information on sensor performance during static and dynamic loading within the realistic test conditions required for compression therapy. This research investigated the sensing performance of five low-cost commercial pressure sensors on a human-leg-like test apparatus and presents quantitative results on the accuracy and drift behaviour of these sensors in both static and dynamic conditions required for compression therapy. Extensive experimental work on this new human-leg-like test setup demonstrated its utility for evaluating the sensors. Results showed variation in static and dynamic sensing performance, including accuracy and drift characteristics. Only one commercially available pressure sensor was found to reliably deliver accuracy of 95% and above for all three test pressure points of 30, 50 and 70 mmHg.

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“…Highly flexible strain sensors 1 have attracted considerable attentions due to their various applications in structural health monitoring 2 , electronic skins [3][4][5] , stretchable solar cells 6,7 and analysis of strain distribution 8,9 , et al To date, flexible strain sensors have been fabricated by employing carbon blacks 10 , carbon nanotubes 11,12 , graphene 13 , nanowires 14,15 , nanoparticles 16 and their hybrid micro/nanostructures 17 . In any case, porous graphene aerogels (GAs) 18,19 with ultralow density and rapid recovery rate are desirable for construction of strain sensors considering of the electronic conductivity and mechanical flexibility [20][21][22] .…”

Section: Introductionmentioning

confidence: 99%

Bio-based graphene/sodium alginate aerogels for strain sensors

et al. 2016

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Highly flexible strain sensors based on graphene aerogels (GAs) have been widely researched. However, most GAs are often found to be extremely weak and delicate to handle due to the π-π stacking and van der Waals interactions between adjacent graphene sheets that leads to a brittle skeleton. Thus constructing graphene structures with excellent mechanical properties, high sensitivity and effective conductive networks is still a big challenge. In this work, we fabricate a bio-based graphene/sodium alginate aerogel with high porosity (99.61%) and low density (6-7 mg/cm 3 ) via freeze drying and chemical reduction. The resulting aerogels exhibit outstanding durability (>6000 loading-unloading cycles), excellent sensitivity to compression (gauge factor is 1.01) and bending (bending sensitivity is 0.172 rad -1 ).The strong hydrogen bonding interactions between graphene and SA are responsible for the synergetic enhancement of strength and elasticity. Taking advantage of the combination of the electronic conductivity and mechanical flexibility, the proposed bio-based aerogels may be a robust candidate in flexible strain sensors. Graphical Abstract:Bio-based graphene aerogels are fabricated with graphene oxide and sodium alginate, showing great potentials in flexible strain sensors due to the excellent mechanical stability and high sensitivity to compression and bending deformations.

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Flexible Pressure Sensors: Modeling and Experimental Characterization

Cited by 16 publications

References 5 publications

Implantable Flexible Pressure Measurement System Based on Inductive Coupling

Implantable Flexible Pressure Measurement System Based on Inductive Coupling

Evaluation of Flexible Force Sensors for Pressure Monitoring in Treatment of Chronic Venous Disorders

Bio-based graphene/sodium alginate aerogels for strain sensors

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