Study on Volleyball Athletes Foot Pressure Acquisition Method

2013 ◽  
Vol 303-306 ◽  
pp. 274-279
Author(s):  
Min Shu ◽  
Yi Yang Li ◽  
Xing Zhi Liao
Keyword(s):  
Professional Training ◽  
Dynamic Pressure ◽  
Pressure Sensors ◽  
High Sensitivity ◽  
Sports Injury ◽  
Fast Response ◽  
Pvdf Film ◽  
Training Design ◽  
Foot Pressure ◽  
Athlete’S Foot

How to improve training records and skill level, and try to minimize sports injury at the same time, has increasingly become the focus of Volleyball Professional Training Design. This paper puts forward a method to acquire the foot pressure information of volleyball athlete. By utilizing PVDF film which has the advantages of fast response, high sensitivity, good mechanical properties etc., the array of pressure sensors and signal conditioning circuit have been designed and produced. Tested, this method can accurately in real time acquire volleyball athlete’s foot dynamic pressure distribution information.

A Dynamic Calibration Test on PVDF Film Pressure Sensor with Dropping Hammer Method

2014 ◽  
Vol 933 ◽  
pp. 548-553 ◽  
Author(s):  
Yong Qiang Wang ◽  
Ying Lin Xiao
Keyword(s):  
Polyvinylidene Fluoride ◽  
Piezoelectric Materials ◽  
Dynamic Pressure ◽  
High Sensitivity ◽  
Pvdf Film ◽  
Piezoelectric Film ◽  
High Mechanical Strength ◽  
Response Range ◽  
New Type ◽  
Shock Wave Pressure

Polyvinylidene Fluoride (referred to as PVDF) piezoelectric film is a new type of polymer piezoelectric materials. Because of its light weight, thin thickness, high sensitivity, high mechanical strength, wide frequency response range and other advantages, it has the application prospect in the explosion field. In this article, film sensors were made based on the PVDF piezoelectric film, and its role in the sensors is the sensitive element. The result of the low dynamic pressure calibration tests showed that it has a very high linear degree and good reproducibility, so that it can be used for low-pressure section of the shock wave pressure measurement.

scholarly journals Rotating Stall in Centrifugal Compressor Vaneless Diffuser: Experimental Analysis of Geometrical Parameters Influence on Phenomenon Evolution

2004 ◽  
Vol 10 (6) ◽  
pp. 433-442 ◽  
Author(s):  
Giovanni Ferrara ◽  
Lorenzo Ferrari ◽  
Leonardo Baldassarre
Keyword(s):  
Centrifugal Compressor ◽  
Dynamic Pressure ◽  
Pressure Sensors ◽  
Experimental Tests ◽  
Fast Response ◽  
Rotating Stall ◽  
Geometrical Parameters ◽  
Vaneless Diffuser ◽  
Response Dynamic ◽  
Frequency Domains

The rotating stall is a key problem for achieving a good working range of a centrifugal compressor and a detailed understanding of the phenomenon is very important to anticipate and avoid it. Many experimental tests have been planned by the authors to investigate the influence on stall behavior of different geometrical configurations. A stage with a backward channel upstream, a 2-D impeller with a vaneless diffuser and a constant cross-section volute downstream, constitute the basic configuration. Several diffuser types with different widths, pinch shapes, and diffusion ratios were tested. The stage was instrumented with many fast response dynamic pressure sensors so as to characterize inception and evolution of the rotating stall. This kind of analysis was carried out both in time and in frequency domains. The methodology used and the results on phenomenon evolution will be presented and discussed in this article.

scholarly journals Locally Controlled Sensing Properties of Stretchable Pressure Sensors Enabled by Micro-Patterned Piezoresistive Device Architecture

Sensors ◽  
2020 ◽  
Vol 20 (22) ◽  
pp. 6588
Author(s):  
Jun Ho Lee ◽  
Jae Sang Heo ◽  
Keon Woo Lee ◽  
Jae Cheol Shin ◽  
Jeong-Wan Jo ◽  
...  
Keyword(s):  
Pressure Sensor ◽  
Silver Nanowires ◽  
Pressure Sensors ◽  
High Sensitivity ◽  
Fast Response ◽  
Large Area ◽  
Site Specific ◽  
Sensing Properties ◽  
Sensing Range ◽  
Wide Range

For wearable health monitoring systems and soft robotics, stretchable/flexible pressure sensors have continuously drawn attention owing to a wide range of potential applications such as the detection of human physiological and activity signals, and electronic skin (e-skin). Here, we demonstrated a highly stretchable pressure sensor using silver nanowires (AgNWs) and photo-patternable polyurethane acrylate (PUA). In particular, the characteristics of the pressure sensors could be moderately controlled through a micro-patterned hole structure in the PUA spacer and size-designs of the patterned hole area. With the structural-tuning strategies, adequate control of the site-specific sensitivity in the range of 47~83 kPa−1 and in the sensing range from 0.1 to 20 kPa was achieved. Moreover, stacked AgNW/PUA/AgNW (APA) structural designed pressure sensors with mixed hole sizes of 10/200 µm and spacer thickness of 800 µm exhibited high sensitivity (~171.5 kPa−1) in the pressure sensing range of 0~20 kPa, fast response (100~110 ms), and high stretchability (40%). From the results, we envision that the effective structural-tuning strategy capable of controlling the sensing properties of the APA pressure sensor would be employed in a large-area stretchable pressure sensor system, which needs site-specific sensing properties, providing monolithic implementation by simply arranging appropriate micro-patterned hole architectures.

Ultrahigh Sensitivity Micro-cliff Graphene Wearable Pressure Sensor Made by Instant Flash Light Exposure

Nanoscale ◽  
2021 ◽  
Author(s):  
Yachu Zhang ◽  
Han Lin ◽  
Fei Meng ◽  
Huai Liu ◽  
David Mesa ◽  
...  
Keyword(s):  
Health Monitoring ◽  
Pressure Sensor ◽  
Biomedical Applications ◽  
Light Exposure ◽  
Pressure Sensors ◽  
High Sensitivity ◽  
Fast Response ◽  
Highly Sensitive ◽  
Ultrahigh Sensitivity ◽  
Sensitive Pressure

Wearable and highly sensitive pressure sensors are of great importance for robotics, health monitoring and biomedical applications. Simultaneously achieving high sensitivity within a broad working range, fast response time (within...

scholarly journals Sea urchin-like microstructure pressure sensors with an ultra-broad range and high sensitivity

2021 ◽  
Vol 12 (1) ◽  
Author(s):  
Xiu-man Wang ◽  
Lu-qi Tao ◽  
Min Yuan ◽  
Ze-ping Wang ◽  
Jiabing Yu ◽  
...  
Keyword(s):  
Sea Urchin ◽  
Pressure Sensor ◽  
Pressure Range ◽  
Synergistic Effects ◽  
Pressure Sensors ◽  
High Sensitivity ◽  
Fast Response ◽  
Carbon Layer ◽  
Single Structure ◽  
Wide Pressure Range

AbstractSensitivity and pressure range are two significant parameters of pressure sensors. Existing pressure sensors have difficulty achieving both high sensitivity and a wide pressure range. Therefore, we propose a new pressure sensor with a ternary nanocomposite Fe2O3/C@SnO2. The sea urchin-like Fe2O3 structure promotes signal transduction and protects Fe2O3 needles from mechanical breaking, while the acetylene carbon black improves the conductivity of Fe2O3. Moreover, one part of the SnO2 nanoparticles adheres to the surfaces of Fe2O3 needles and forms Fe2O3/SnO2 heterostructures, while its other part disperses into the carbon layer to form SnO2@C structure. Collectively, the synergistic effects of the three structures (Fe2O3/C, Fe2O3/SnO2 and SnO2@C) improves on the limited pressure response range of a single structure. The experimental results demonstrate that the Fe2O3/C@SnO2 pressure sensor exhibits high sensitivity (680 kPa−1), fast response (10 ms), broad range (up to 150 kPa), and good reproducibility (over 3500 cycles under a pressure of 110 kPa), implying that the new pressure sensor has wide application prospects especially in wearable electronic devices and health monitoring.

scholarly journals Novel Flexible Piezoresistive Sensor based on 2D Ti3C2Tx MXene

2020 ◽  
Author(s):  
Patrik Sobolciak ◽  
Kishor Kumar Sadasivuni ◽  
Aisha Tanvir ◽  
Igor Krupa
Keyword(s):  
Electrical Conductivity ◽  
Transition Metal ◽  
Energy Requirement ◽  
Applied Pressure ◽  
Pressure Sensors ◽  
High Sensitivity ◽  
Fast Response ◽  
Human Machine Interaction ◽  
Biomedical Monitoring ◽  
New Family

Stretchable and wearable strain-sensing devices are appropriate for motion detection, biomedical monitoring, human-machine interaction. These pressure sensors are working based on numerous electrophysical phenomena's such as piezoelectric, capacitive and piezoresistive reactions towards mechanical stretching. Piezoresistive sensors are highly favored due to their features like high sensitivity, fast response, easy fabrication and low energy requirement. They are generally fabricated using a suitable polymeric matrix and electrically conductive fillers, such as graphite, graphene or carbon nanotubes. MXenes are a relatively new family of (2D) transition metal carbides, nitrides or carbonitrides, produced by the selective chemical etching of “A” from MAXphases, where M is a transition metal, A is a group IIIA or IVA element and X is C or N. These nanomaterials are first reported in 2011 by the Gogotsi and Barsoum groups. These materials have received tremendous attention from the scientific community due to their excellent physiochemical properties, electrical conductivity and hydrophilicity. Herein, we report the preparation, characterization and piezoresistive individualities of semiconductive, electrospun mats composed of copolyamide 6, 10 and Ti3C2Tx. We observed that the relative resistance of the sensor increased with an increase in the Ti3C2Tx content, and the materials with higher electrical conductivity showcased a significantly higher sensitivity to applied pressure until reaching the percolation limit (font size can be increased).

Micropower Generators and Sensors Based on Piezoelectric Polypropylene PP and Polyvinylidene Fluoride PVDF Films - Energy Harvesting from Walking

2011 ◽  
Vol 110-116 ◽  
pp. 1245-1251 ◽  
Author(s):  
Ewa Klimiec ◽  
Krzysztof Zaraska ◽  
Wiesław Zaraska ◽  
Szymon Kuczyński
Keyword(s):  
Polyvinylidene Fluoride ◽  
Active Element ◽  
Pressure Sensors ◽  
Single Layer ◽  
Measuring System ◽  
Pvdf Film ◽  
Foot Pressure ◽  
Data Record ◽  
Film Layer ◽  
Micropower Generators

This paper presents investigation of piezoelectric proprieties of polypropylene PP and polyvinylidene fluoride PVDF films at an angle of their application as micropower generators and foot pressure sensors in walking process. Obtaind micropower from single layer is about 1.7W and 5.3W for polypropylene film and about 1.7W and 3.3W for polyvinylidene fluoride film. Obtained voltage from single film layer is 8.9V to 14V for PP film and 2 to 3.4V for PVDF film. Obtained micropower from piezoelectric film and course character of voltage in function of time during walking process, depends from used film and shoe insole construction, where active element was sandwich. Recived data record of voltage, power and foot movement images from measuring system, can be use in dynamic investigations of posture defects.

scholarly journals Impact of Fabric Properties on Textile Pressure Sensors Performance

Sensors ◽  
2019 ◽  
Vol 19 (21) ◽  
pp. 4686 ◽  
Author(s):  
Luca Possanzini ◽  
Marta Tessarolo ◽  
Laura Mazzocchetti ◽  
Enrico Gianfranco Campari ◽  
Beatrice Fraboni
Keyword(s):  
Pressure Range ◽  
Operation Mode ◽  
Conductive Polymer ◽  
Pressure Sensors ◽  
High Sensitivity ◽  
Foot Pressure ◽  
Sensing Applications ◽  
High Pressure Range ◽  
Physical And Chemical ◽  
Ink Formulation

In recent years, wearable technologies have attracted great attention in physical and chemical sensing applications. Wearable pressure sensors with high sensitivity in low pressure range (<10 kPa) allow touch detection for human-computer interaction and the development of artificial hands for handling objects. Conversely, pressure sensors that perform in a high pressure range (up to 100 kPa), can be used to monitor the foot pressure distribution, the hand stress during movements of heavy weights or to evaluate the cyclist’s pressure pattern on a bicycle saddle. Recently, we developed a fully textile pressure sensor based on a conductive polymer, with simple fabrication and scalable features. In this paper, we intend to provide an extensive description on how the mechanical properties of several fabrics and different piezoresistive ink formulation may have an impact in the sensor’s response during a dynamic operation mode. These results highlight the complexity of the system due to the presence of various parameters such as the fabric used, the conductive polymer solution, the operation mode and the desired pressure range. Furthermore, this work can lead to a protocol for new improvements and optimizations useful for adapting textile pressure sensors to a large variety of applications.

FIBER LASER HYDROPHONES AS PRESSURE SENSORS

2006 ◽  
Vol 21 (supp01) ◽  
pp. 102-106
Author(s):  
P. E. BAGNOLI ◽  
N. BEVERINI ◽  
E. CASTORINA ◽  
E. FALCHINI ◽  
R. FALCIAI ◽  
...  
Keyword(s):  
Fiber Laser ◽  
Acoustic Waves ◽  
Dynamic Pressure ◽  
Pressure Sensors ◽  
High Sensitivity ◽  
Single Mode ◽  
High Energy ◽  
Single Mode Fiber ◽  
Wavelength Shift ◽  
Order Of Magnitude

The development of hydro-phonic sensors for deep see acoustic detection is described. The sensitive element is an erbium-doped single mode fiber laser, with the cavity delimited by two Bragg grating reflectors. The variations of temperature and pressure perturb the cavity, inducing a wavelength shift. The very narrow emission band of the laser, together with the interferometric detection technique, allows a dynamic pressure sensitivity in the μ Pa range. The devices have been characterized both optically and acoustically in a closed tub. A resin coating of the fiber laser has been experimented: this technique improves the sensitivity by more than one order of magnitude. The high sensitivity makes these sensors suitable for the detection of the acoustic waves induced in water by Ultra High Energy Neutrinos.

Sign in / Sign up

Export Citation Format

Share Document