scholarly journals Nanocomposite-Based Microstructured Piezoresistive Pressure Sensors for Low-Pressure Measurement Range

Micromachines ◽  
2018 ◽  
Vol 9 (2) ◽  
pp. 43 ◽  
Author(s):  
Vasileios Mitrakos ◽  
Philip Hands ◽  
Gerard Cummins ◽  
Lisa Macintyre ◽  
Fiona Denison ◽  
...  
Keyword(s):  
Pressure Measurement ◽  
Pressure Sensors ◽  
Low Pressure ◽  
Measurement Range ◽  
Piezoresistive Pressure Sensors

scholarly journals Carbon/Silicone Nanocomposite-Enabled Soft Pressure Sensors with a Liquid-Filled Cell Structure Design for Low Pressure Measurement

Sensors ◽  
2021 ◽  
Vol 21 (14) ◽  
pp. 4732
Author(s):  
Fei Wang ◽  
Xiaoming Tao
Keyword(s):  
Pressure Measurement ◽  
Cell Structure ◽  
Pressure Sensors ◽  
High Sensitivity ◽  
Humanoid Robots ◽  
Low Pressure ◽  
Measurement Range ◽  
Structure Design ◽  
Wearable Electronics ◽  
Minimal Resistance

In the fields of humanoid robots, soft robotics, and wearable electronics, the development of artificial skins entails pressure sensors that are low in modulus, high in sensitivity, and minimal in hysteresis. However, few sensors in the literature can meet all the three requirements, especially in the low pressure range (<10 kPa). This article presents a design for such pressure sensors. The bioinspired liquid-filled cell-type structural design endows the sensor with appropriate softness (Young’s modulus < 230 kPa) and high sensitivity (highest at 0.7 kPa−1) to compression forces below 0.65 N (6.8 kPa). The low-end detection limit is ~0.0012 N (13 Pa), only triple the mass of a bee. Minimal resistance hysteresis of the pressure sensor is 7.7%. The low hysteresis is attributed to the study on the carbon/silicone nanocomposite, which reveals the effect of heat treatment on its mechanical and electromechanical hysteresis. Pressure measurement range and sensitivity of the sensor can be tuned by changing the structure and strain gauge parameters. This concept of sensor design, when combined with microfluidics technology, is expected to enable soft, stretchable, and highly precise touch-sensitive artificial skins.

scholarly journals Design, Manufacture and Testing of Capacitive Pressure Sensors for Low-Pressure Measurement Ranges

Micromachines ◽  
2017 ◽  
Vol 8 (2) ◽  
pp. 41 ◽  
Author(s):  
Vasileios Mitrakos ◽  
Lisa Macintyre ◽  
Fiona Denison ◽  
Philip Hands ◽  
Marc Desmulliez
Keyword(s):  
Pressure Measurement ◽  
Pressure Sensors ◽  
Low Pressure

scholarly journals Sensitivity of Piezoresistive Pressure Sensors to Acceleration

Energies ◽  
2022 ◽  
Vol 15 (2) ◽  
pp. 493
Author(s):  
Zygmunt Szczerba ◽  
Piotr Szczerba ◽  
Kamil Szczerba
Keyword(s):  
Measurement System ◽  
Pressure Measurement ◽  
Measurement Errors ◽  
Moving Objects ◽  
Pressure Sensors ◽  
Point Pressure ◽  
Method Of Measurement ◽  
Piezoresistive Pressure Sensors ◽  
Pressure Measurement System

The article presents the negative aspects of the influence of static and dynamic acceleration on the accuracy of pressure measurement for a selected type of transmitter. The influence of static accelerations from catalog notes was shown and compared with the tests results for a few selected sensors. The results of research on the influence of dynamic acceleration for various types of its variability for selected converters are presented. Moreover, a method of measurement patented by the authors that uses a complex transducer is shown. The method allows for more accurate measurements on moving objects. The tests were performed based on the proposed method. The obtained results of the influence of acceleration on the classical sensor as well as the construction using the proposed method are shown. The paper presents approximate pressure measurement errors resulting from the influence of acceleration. For example, errors in measuring the speed of an airplane may occur without the proposed method. The last part of the article presents a unique design dedicated to a multi-point pressure measurement system, which uses the presented method of eliminating the influence of accelerations on the pressure measurement.

scholarly journals Flexible Ultra-Thin Nanocomposite Based Piezoresistive Pressure Sensors for Foot Pressure Distribution Measurement

Sensors ◽  
2021 ◽  
Vol 21 (18) ◽  
pp. 6082
Author(s):  
Dhivakar Rajendran ◽  
Rajarajan Ramalingame ◽  
Saravanan Palaniyappan ◽  
Guntram Wagner ◽  
Olfa Kanoun
Keyword(s):  
Pressure Distribution ◽  
Pressure Measurement ◽  
Low Cost ◽  
Measurement Techniques ◽  
Pressure Sensors ◽  
High Sensitivity ◽  
Measurement Range ◽  
Experimental Investigations ◽  
Healthcare Applications ◽  
Foot Pressure

Foot pressure measurement plays an essential role in healthcare applications, clinical rehabilitation, sports training and pedestrian navigation. Among various foot pressure measurement techniques, in-shoe sensors are flexible and can measure the pressure distribution accurately. In this paper, we describe the design and characterization of flexible and low-cost multi-walled carbon nanotubes (MWCNT)/Polydimethylsiloxane (PDMS) based pressure sensors for foot pressure monitoring. The sensors have excellent electrical and mechanical properties an show a stable response at constant pressure loadings for over 5000 cycles. They have a high sensitivity of 4.4 kΩ/kPa and the hysteresis effect corresponds to an energy loss of less than 1.7%. The measurement deviation is of maximally 0.13% relative to the maximal relative resistance. The sensors have a measurement range of up to 330 kPa. The experimental investigations show that the sensors have repeatable responses at different pressure loading rates (5 N/s to 50 N/s). In this paper, we focus on the demonstration of the functionality of an in-sole based on MWCNT/PDMS nanocomposite pressure sensors, weighing approx. 9.46 g, by investigating the foot pressure distribution while walking and standing. The foot pressure distribution was investigated by measuring the resistance changes of the pressure sensors for a person while walking and standing. The results show that pressure distribution is higher in the forefoot and the heel while standing in a normal position. The foot pressure distribution is transferred from the heel to the entire foot and further transferred to the forefoot during the first instance of the gait cycle.

scholarly journals Influence of the Porosity of Polymer Foams on the Performances of Capacitive Flexible Pressure Sensors

Sensors ◽  
2019 ◽  
Vol 19 (9) ◽  
pp. 1968 ◽  
Author(s):  
Sylvie Bilent ◽  
Thi Hong Nhung Dinh ◽  
Emile Martincic ◽  
Pierre-Yves Joubert
Keyword(s):  
Experimental Data ◽  
Linear Model ◽  
Dielectric Material ◽  
Pressure Sensors ◽  
Volume Ratio ◽  
Measurement Range ◽  
Polymer Foams ◽  
First Order ◽  
Non Linear ◽  
Flexible Pressure Sensors

This paper reports on the study of microporous polydimethylsiloxane (PDMS) foams as a highly deformable dielectric material used in the composition of flexible capacitive pressure sensors dedicated to wearable use. A fabrication process allowing the porosity of the foams to be adjusted was proposed and the fabricated foams were characterized. Then, elementary capacitive pressure sensors (15 × 15 mm2 square shaped electrodes) were elaborated with fabricated foams (5 mm or 10 mm thick) and were electromechanically characterized. Since the sensor responses under load are strongly non-linear, a behavioral non-linear model (first order exponential) was proposed, adjusted to the experimental data, and used to objectively estimate the sensor performances in terms of sensitivity and measurement range. The main conclusions of this study are that the porosity of the PDMS foams can be adjusted through the sugar:PDMS volume ratio and the size of sugar crystals used to fabricate the foams. Additionally, the porosity of the foams significantly modified the sensor performances. Indeed, compared to bulk PDMS sensors of the same size, the sensitivity of porous PDMS sensors could be multiplied by a factor up to 100 (the sensitivity is 0.14 %.kPa−1 for a bulk PDMS sensor and up to 13.7 %.kPa−1 for a porous PDMS sensor of the same dimensions), while the measurement range was reduced from a factor of 2 to 3 (from 594 kPa for a bulk PDMS sensor down to between 255 and 177 kPa for a PDMS foam sensor of the same dimensions, according to the porosity). This study opens the way to the design and fabrication of wearable flexible pressure sensors with adjustable performances through the control of the porosity of the fabricated PDMS foams.

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