Foot Pressure-Sensor System for Tracking Safety and Health

2014 ◽  
Vol 26 (1) ◽  
pp. 116-119
Author(s):  
Kenneth Shinozuka ◽  
Keyword(s):  
Pressure Sensor ◽  
Low Cost ◽  
Control Software ◽  
Foot Pressure ◽  
Gait Characteristics ◽  
Safety And Health ◽  
Audible Sound ◽  
Health Care Applications ◽  
Flexible Pressure Sensor ◽  
And Control

This paper presents an innovative pressure sensor systemembedded in a sock, which has a number of health care applications. One of these is the low-cost, reliable detection of the bed-departure of Alzheimer’s patients, an increasingly common problem that causes significant stress to caregivers. The system comprises a pressure sensor embedded in a sock and a coin battery-powered microcontroller containing a radiofrequency module. Once the user wanders out of bed and steps onto the floor, the sensor on the sock will immediately detect the pressure caused by his or her body weight and will wirelessly trigger an audible sound in a caregiver’s monitoring unit, which can be a Smartphone, tablet, or dedicated monitor. Furthermore, the pressure sensor and the microcontroller can be combined into one re-attachable unit, which can be stuck conveniently to the ball or heel of the user’s foot or any ordinary sock, slipper or shoe. In addition, the system can function as a highly accurate pedometer that is useful for monitoring the user’s health by tracking changes in his or her gait characteristics. In this study, a prototype sensor sock was developed that included an ultra-thin flexible pressure sensor, microcontroller, Bluetooth low energy module, and control software. The efficacy of the sensor sock in detecting and alerting patients’ wandering has been demonstrated.

scholarly journals Linearly Sensitive and Flexible Pressure Sensor Based on Porous Carbon Nanotube/Polydimethylsiloxane Composite Structure

Polymers ◽  
2020 ◽  
Vol 12 (7) ◽  
pp. 1499 ◽  
Author(s):  
Young Jung ◽  
Kyung Kuk Jung ◽  
Dong Hwan Kim ◽  
Dong Hwa Kwak ◽  
Jong Soo Ko
Keyword(s):  
Carbon Nanotube ◽  
Pressure Sensor ◽  
Porous Carbon ◽  
Composite Structure ◽  
Low Cost ◽  
Human Motion ◽  
Mechanical And Electrical Properties ◽  
Human Motion Detection ◽  
Working Principle ◽  
Flexible Pressure Sensor

We developed a simple, low-cost process to fabricate a flexible pressure sensor with linear sensitivity by using a porous carbon nanotube (CNT)/polydimethylsiloxane (PDMS) composite structure (CPCS). The working principle of this pressure sensor is based on the change in electrical resistance caused by the contact/non-contact of the CNT tip on the surface of the pores under pressure. The mechanical and electrical properties of the CPCSs could be quantitatively controlled by adjusting the concentration of CNTs. The fabricated flexible pressure sensor showed linear sensitivity and excellent performance with regard to repeatability, hysteresis, and reliability. Furthermore, we showed that the sensor could be applied for human motion detection, even when attached to curved surfaces.

Flexible Pressure Sensor Based on Photo Paper-Molded Micro-Structural AgNWs/PDMS Electrode

2015 ◽  
Vol 748 ◽  
pp. 1-4 ◽  
Author(s):  
Li Xin Mo ◽  
Yu Qun Hou ◽  
Qing Bin Zhai ◽  
Wen Guan Zhang ◽  
Lu Hai Li
Keyword(s):  
Pressure Sensor ◽  
Silver Nanowires ◽  
Low Cost ◽  
Flexible Substrate ◽  
High Sensitivity ◽  
Low Energy ◽  
Capacitive Pressure Sensor ◽  
Micro Structure ◽  
Energy Consuming ◽  
Flexible Pressure Sensor

The novel flexible pressure sensor with skin-like stretchability and sensibility has attracted tremendous attention in academic and industrial world in recent years. And it also has demonstrated great potential in the applications of electronic skin and wearable devices. It is significant and challenging to develop a highly sensitive flexible pressure sensor with a simple, low energy consuming and low cost method. In this paper, the silver nanowires (AgNWs) as electrode material were synthesized by polyol process. The polydimethylsiloxane (PDMS) was chosen as a flexible substrate and polyimide (PI) film as dielectric layer. The AgNWs based electrode was prepared in two methods. One is coating the AgNWs on photographic paper followed by in situ PDMS curing. Another one is suction filtration of the AgNWs suspension followed by glass slide transfer and PDMS curing. Then the capacitive pressure sensor was packaged in a sandwich structure with two face to face electrodes and a PI film in the middle. The sensitivity of the sensor as well as the micro-structure of the electrodes was compared and studied. The results indicate that the roughness of the electrode based on AgNWs/PDMS micro-structure plays an important role in the sensitivity of sensor. The as-prepared flexible pressure sensor demonstrates high sensitivity of 0.65kPa-1. In addition, the fabrication method is simple, low energy consuming and low cost, which has great potential in the detection of pulse, heart rate, sound vibration and other tiny pressure.

scholarly journals Implementation and design of new low-cost foot pressure sensor module using piezoelectric sensor in T-FLoW humanoid robot

2019 ◽  
Vol 9 (1) ◽  
pp. 203
Author(s):  
R. Dimas Pristovani ◽  
Dewanto Sanggar ◽  
Pramadihanto Dadet
Keyword(s):  
Pressure Sensor ◽  
Humanoid Robot ◽  
Body Force ◽  
Center Of Pressure ◽  
Low Cost ◽  
Piezoelectric Sensor ◽  
Position Vector ◽  
Stream Data ◽  
Foot Pressure ◽  
Sensor Module

<span lang="EN-US">Basically, human can sense the active body force trough the soles of their feet and can feel the position vector of zero moment point (ZMP) based on the center of pressure (CoP) from active body force. This behavior is adapted by T-FLoW humanoid robot using unique sensor which is piezoelectric sensor. Piezoelectric sensor has a characteristic which is non-continuous reading (record a data only a moment). Because of it, this sensor cannot be used to stream data such as flex sensor, loadcell sensor, and torque sensor like previous research. Therefore, the piezoelectric sensor still can be used to measure the position vector of ZMP. The idea is using this sensor in a special condition which is during landing condition. By utilizing 6 unit of piezoelectric sensor with a certain placement, the position vector of ZMP (X-Y-axis) and pressure value in Z-axis from action body force can be found. The force resultant method is used to find the position vector of ZMP from each piezoelectric sensor. Based on those final conclusions in each experiment, the implementation of foot pressure sensor modul using piezoelectric sensor has a good result (94%) as shown in final conclusions in each experiment. The advantages of this new foot pressure sensor modul is low-cost design and similar result with another sensor. The disadvantages of this sensor are because of the main characteristic of piezoelectric sensor (non-continuous read) sometimes the calculation has outlayer data.</span>

scholarly journals A Low-Cost, Flexible Pressure Capacitor Sensor Using Polyurethane for Wireless Vehicle Detection

Polymers ◽  
2019 ◽  
Vol 11 (8) ◽  
pp. 1247 ◽  
Author(s):  
Chien Khong Duc ◽  
Van-Phuc Hoang ◽  
Duy Tien Nguyen ◽  
Toan Thanh Dao
Keyword(s):  
Pressure Sensor ◽  
Low Cost ◽  
Vehicle Detection ◽  
Intelligent Transportation ◽  
External Pressure ◽  
Transportation Management ◽  
The Road ◽  
Promising Tool ◽  
On The Road ◽  
Flexible Pressure Sensor

Detection of vehicles on the road can contribute to the establishment of an intelligent transportation management system to allow smooth transportation and the reduction of road accidents. Thus far, an efficient and low-cost polymer flexible pressure sensor for vehicle detection is lacking. This paper presents a flexible sensor for vehicle sensing and demonstrates a wireless system for monitoring vehicles on the road. A vehicle sensor was fabricated by sandwiching a polyurethane material between aluminum top/bottom electrodes. The sensing mechanism was based on changes in capacitance due to variation in the distance between the two electrodes at an applied external pressure. A clear response against a pressure load of 0.65 Mpa was observed, which is the same pressure as that of the car tire area in contact with the road. Significantly, the sensor was easy to embed on the road line due to its mechanical flexibility and large size. A field test was carried out by embedding the sensor on the road and crossing the sensor with a car. Moreover, the signal displayed on the tablet indicated that the sensing system can be used for wireless detection of the axle, speed, or weight of the vehicle on the road. The findings suggest that the flexible pressure sensor is a promising tool for use as a low-cost vehicle detector in future intelligent transportation management.

scholarly journals Microdome-Tunable Graphene/Carbon Nanotubes Pressure Sensors Based on Polystyrene Array for Wearable Electronics

Materials ◽  
2021 ◽  
Vol 14 (23) ◽  
pp. 7385
Author(s):  
Xingjie Su ◽  
Chunli Luo ◽  
Weiguo Yan ◽  
Junyi Jiao ◽  
Dongzhou Zhong
Keyword(s):  
Carbon Nanotubes ◽  
Pressure Sensor ◽  
Self Assembly ◽  
Low Cost ◽  
Pressure Sensors ◽  
Conductive Filler ◽  
Human Motion ◽  
Wearable Electronics ◽  
Flexible Pressure Sensor ◽  
Human Finger

Resistive pressure sensors are appealing due to having several advantages, such as simple reading mechanisms, simple construction, and quick dynamic response. Achieving a constantly changeable microstructure of sensing materials is critical for the flexible pressure sensor and remains a difficulty. Herein, a flexible, tunable resistive pressure sensors is developed via simple, low-cost microsphere self-assembly and graphene/carbon nanotubes (CNTs) solution drop coating. The sensor uses polystyrene (PS) microspheres to construct an interlocked dome microstructure with graphene/CNTs as a conductive filler. The results indicate that the interlocked microdome-type pressure sensor has better sensitivity than the single microdome-type and single planar-type without surface microstructure. The pressure sensor’s sensitivity can be adjusted by varying the diameter of PS microspheres. In addition, the resistance of the sensor is also tunable by adjusting the number of graphene/CNT conductive coating layers. The developed flexible pressure sensor effectively detected human finger bending, demonstrating tremendous potential in human motion monitoring.

Low-cost flexible pressure sensor based on dielectric elastomer film with micro-pores

2016 ◽  
Vol 240 ◽  
pp. 103-109 ◽  
Author(s):  
Bo-Yeon Lee ◽  
Jiyoon Kim ◽  
Hyungjin Kim ◽  
Chiwoo Kim ◽  
Sin-Doo Lee
Keyword(s):  
Pressure Sensor ◽  
Low Cost ◽  
Dielectric Elastomer ◽  
Flexible Pressure Sensor

Low cost flexible pressure sensor using laser scribed GO/RGO periodic structure for electronic skin applications

2020 ◽  
Vol 140 ◽  
pp. 106470
Author(s):  
Zahra Hosseindokht ◽  
Raheleh Mohammadpour ◽  
Elham Asadian ◽  
Mohsen Paryavi ◽  
Hashem Rafii-Tabar ◽  
...  
Keyword(s):  
Periodic Structure ◽  
Pressure Sensor ◽  
Low Cost ◽  
Electronic Skin ◽  
Flexible Pressure Sensor

Lignin-based highly sensitive flexible pressure sensor for wearable electronics

2018 ◽  
Vol 6 (24) ◽  
pp. 6423-6428 ◽  
Author(s):  
Bingxin Wang ◽  
Ting Shi ◽  
Yanru Zhang ◽  
Changzhou Chen ◽  
Qiang Li ◽  
...  
Keyword(s):  
Pressure Sensor ◽  
Intelligent Systems ◽  
Low Cost ◽  
Wearable Electronics ◽  
Good Reproducibility ◽  
Flexible Sensors ◽  
Highly Sensitive ◽  
Facile Preparation ◽  
Flexible Pressure Sensor

The development of flexible sensors with low cost, facile preparation and good reproducibility is of profound significance for wearable electronics and intelligent systems.

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