An Analytical Model for Porous Polymer-Ceramic Capacitive Pressure Sensors

2014 ◽  
Vol 14 (12) ◽  
pp. 4411-4422 ◽  
Author(s):  
Timothy L. Weadon ◽  
Thomas H. Evans ◽  
Edward M. Sabolsky
Keyword(s):  
Analytical Model ◽  
Pressure Sensors ◽  
Porous Polymer

Analytical Model of Micropyramidal Capacitive Pressure Sensors and Machine‐Learning‐Assisted Design

2021 ◽  
pp. 2100634
Author(s):  
Chao Ma ◽  
Gang Li ◽  
Longhui Qin ◽  
Weicheng Huang ◽  
Hongrui Zhang ◽  
...  
Keyword(s):  
Machine Learning ◽  
Analytical Model ◽  
Pressure Sensors

Porous Polymer/Ceramic Composites for Luminescence-Based Temperature and Pressure Measurement

1999 ◽  
Vol 560 ◽  
Author(s):  
A.M. Scroggin ◽  
E.B. Slamovich ◽  
J.W. Crafton ◽  
N. Lachendro ◽  
J.P. Sullivan
Keyword(s):  
Rhodamine B ◽  
Response Times ◽  
Tape Casting ◽  
Pressure Sensors ◽  
Fast Response ◽  
Ceramic Composites ◽  
Porous Polymer ◽  
Ceramic Films ◽  
Tape Cast ◽  
Cryogenic Conditions

ABSTRACTPorous Polymer/ceramic films were processed via tape casting. Upon doping with luminescent molecules such as platinum(II) octaethylporphine and [Ru(4,7-diphenyl-1,10-phenanthroline)3]C12, the films were used as pressure sensors, yielding a Stern-Volmer constant of A ranging from 0.02 to 0.61. These films also exhibited very fast response times (∼I ms). Tape cast films doped with Rhodamine B were used as temperature sensors under cryogenic conditions. The temperature sensitivity of the doped films increased with increasing Rhodamine B concentration.

scholarly journals Development of porous polymer pressure sensors incorporating graphene platelets

2014 ◽  
Vol 37 ◽  
pp. 129-137 ◽  
Author(s):  
Vera Gonçalves ◽  
Lúcia Brandão ◽  
Adélio Mendes
Keyword(s):  
Pressure Sensors ◽  
Porous Polymer ◽  
Graphene Platelets

scholarly journals Fault detection and accommodation of a thermal-type flow sensor in an aircraft bleed air system

2021 ◽  
Author(s):  
Christopher Day
Keyword(s):  
Fault Detection ◽  
Analytical Model ◽  
Mass Flow ◽  
Flow Rate ◽  
Pressure Sensors ◽  
Flow Sensor ◽  
Rule Base ◽  
Sensor Fault ◽  
Air System ◽  
Mass Flow Sensor

A fault in the primary mass flow sensor of an aircraft engine bleed air system can cause significant deterioration of overall system performance. This project uses an analytical model of the bleed air system to create a fault detection and accommodation scheme for the mass flow sensor. The analytical model uses information from the upstream and downstream pressure sensors to predict the output of the mass flow sensor. Faults are detected by comparing the output from the sensor with the predicted output from the analytical model. A fuzzy logic rule base is used to determine the degree of the flow sensor fault. The degree of the sensor fault is used to determine the inaccuracy of the faulty sensor output. A corrected estimation of the flow rate is then created using a weighted algorithm consisting of the predicted flow rate from the analytical model and the flow rate from the faulty sensor. The analytical model is also used to detect and accommodate transient responses from the flow sensor including signal overshoot, oscillations and time constant errors. A MATLAB computer simulation is conducted to evaluate the performance of the bleed air system degrades slightly in the event of a fault of the flow sensor. While the sensor fault will degrade the performance of the bleed air system, the degradation is not significant, and the bleed air system is able to maintain acceptable performance in the presence of faults.

scholarly journals Porous Polymer Based Flexible Pressure Sensors for Medical Applications

Proceedings ◽  
2018 ◽  
Vol 2 (13) ◽  
pp. 849 ◽  
Author(s):  
Sylvie Bilent ◽  
Thi Hong Nhung Dinh ◽  
Emile Martincic ◽  
Pierre-Yves Joubert
Keyword(s):  
Mechanical Properties ◽  
Pressure Sensors ◽  
Behavioral Model ◽  
Measurement Range ◽  
Porous Polymer ◽  
Medical Applications ◽  
Capacitive Pressure Sensor ◽  
Pdms Film ◽  
Flexible Pressure Sensors ◽  
Film Porosity

This paper focuses on the use of microporous PDMS foams as a highly deformable film to improve the sensitivity of flexible capacitive pressure sensor dedicated to wearable use. A fabrication process allowing the mechanical properties of foams to be adjusted is proposed together with a non-linear behavioral model used to objectively estimate the sensor performances in terms of sensitivity and measurement range. Sensors fabricated and characterized in this study show that the sensitivity and the measurement range can be adjusted from 0.14%/kPa up to 13.07%/kPa, and from 594 kPa to 183 kPa, respectively, while the PDMS film porosity ranges from 0% up to 85%.

scholarly journals Fault detection and accommodation of a thermal-type flow sensor in an aircraft bleed air system

2021 ◽  
Author(s):  
Christopher Day
Keyword(s):  
Fault Detection ◽  
Analytical Model ◽  
Mass Flow ◽  
Flow Rate ◽  
Pressure Sensors ◽  
Flow Sensor ◽  
Rule Base ◽  
Sensor Fault ◽  
Air System ◽  
Mass Flow Sensor

A fault in the primary mass flow sensor of an aircraft engine bleed air system can cause significant deterioration of overall system performance. This project uses an analytical model of the bleed air system to create a fault detection and accommodation scheme for the mass flow sensor. The analytical model uses information from the upstream and downstream pressure sensors to predict the output of the mass flow sensor. Faults are detected by comparing the output from the sensor with the predicted output from the analytical model. A fuzzy logic rule base is used to determine the degree of the flow sensor fault. The degree of the sensor fault is used to determine the inaccuracy of the faulty sensor output. A corrected estimation of the flow rate is then created using a weighted algorithm consisting of the predicted flow rate from the analytical model and the flow rate from the faulty sensor. The analytical model is also used to detect and accommodate transient responses from the flow sensor including signal overshoot, oscillations and time constant errors. A MATLAB computer simulation is conducted to evaluate the performance of the bleed air system degrades slightly in the event of a fault of the flow sensor. While the sensor fault will degrade the performance of the bleed air system, the degradation is not significant, and the bleed air system is able to maintain acceptable performance in the presence of faults.

scholarly journals Extending Porous Silicone Capacitive Pressure Sensor Applications into Athletic and Physiological Monitoring

Sensors ◽  
2021 ◽  
Vol 21 (4) ◽  
pp. 1119
Author(s):  
Yun Xia ◽  
Hao Gu ◽  
Lei Xu ◽  
Xiao Dong Chen ◽  
Tim V. Kirk
Keyword(s):  
Body Position ◽  
Pressure Sensors ◽  
Capacitive Sensor ◽  
Dielectric Materials ◽  
Porous Polymer ◽  
Medical Attention ◽  
Physiological Monitoring ◽  
Capacitive Pressure Sensor ◽  
Sensor Applications ◽  
Position Detection

Porous polymer dielectric materials have been developed to increase the sensitivity of capacitive pressure sensors, so that they might expand capacitive sensor use, and promote the realization of the advantages of this class of sensor in further fields. However, their use has not been demonstrated in physiological monitoring applications such as respiration monitoring and body position detection during sleep; an area in need of unmet medical attention for conditions such as sleep apnea. Here, we develop and characterize a sensor comprised of a poly dimethylsiloxane (PDMS) sponge dielectric layer, and PDMS/carbon black (CB) blend electrode layers, with suitable compliance and sensitivity for integration in mattresses, pillows, and athletic shoe insoles. With relatively high pressure sensitivity (~0.1 kPa−1) and mechanical robustness, this sensor was able to fulfill a wide variety of roles, including athletic monitoring in an impact mechanics scenario, by recording heel pressure during running and walking, and physiological monitoring, by detecting head position and respiration of a subject lying on a pad and pillow. The sensor detected considerably greater relative signal changes than those reported in recent capacitive sensor studies for heel pressure, and for a comparably minimal, resistive sensor during respiration, in line with its enhanced sensitivity.

Analytical Modeling of an Implantable Opto-Mechanical Pressure Sensor to Study Long Term Drift

2020 ◽  
Author(s):  
Alex Phan ◽  
Phuong Truong ◽  
Christoph Schade ◽  
Kevin Joslin ◽  
Frank Talke
Keyword(s):  
Intraocular Pressure ◽  
Analytical Model ◽  
Pressure Sensor ◽  
Pressure Sensors ◽  
Zero Drift ◽  
Membrane Thickness ◽  
Circular Membrane ◽  
Mechanical Pressure ◽  
Bulge Testing

Abstract “Zero-drift” characteristics of an optical intraocular pressure sensor is investigated as a function of membrane dissolution and hygroscopic swelling of the epoxy layer. Both effects were studied using an analytical model based on the deflection of a circular membrane. Results from the analytical model were verified with experimental results from “bulge” testing. The analytical model was used to study the “zero drift” of the sensor as a function of changes in membrane thickness and geometry of the sensor. The results show that dissolution of the membrane and swelling of the spacer layer can contribute to zero-drift over time. The results are useful in guiding design and fabrication optimization to minimize drift in intraocular pressure sensors used for long term implantation.

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