scholarly journals Measuring Mechanism and Applications of Polymer-Based Flexible Sensors

Sensors ◽  
2019 ◽  
Vol 19 (6) ◽  
pp. 1403 ◽  
Author(s):  
Zewen Yang ◽  
Hong Xu ◽  
Yao Huang ◽  
Jingyao Sun ◽  
Daming Wu ◽  
...  
Keyword(s):  
Output Signal ◽  
Elastic Recovery ◽  
Periodic Load ◽  
Flexible Sensors ◽  
Flexible Sensor ◽  
Measured Object ◽  
Assembly Method ◽  
Sensor Structure ◽  
Output Characteristics ◽  
Measurement Mechanism

A new type of flexible sensor, which could maintain the deformation consistency and achieve the real-time detection of the variation in load of the measured object, was proposed in this work. According to the principle of forced assembly, PDMS was used as the substrate of sensitive components and electrodes, while carbon fiber was added as a conductive medium to prepare a polymer-based flexible sensor, which effectively overcame the deformation limitation and output instability of conventional flexible sensors due to different substrates of sensitive components and the electrode. Combined with the sensor structure and the forced assembly method, a theoretical analysis of its conductive measurement mechanism was carried out. Meanwhile, an experimental test device was designed to test and analyze the output characteristics of the flexible sensor under a static and dynamic alternating load. The results show that the flexible sensor exhibited linear output under the dynamic alternating load of 10 kN to 60 kN and frequency of 3 Hz. Peak and valley value had the same phase with the load extremes. The dynamic and static experiments show that the resistance output signal and the sensitivity was in the range of 310~624.15 Ω and 171–183 N/Ω respectively. However, due to the hysteresis of the elastic recovery of the polymer, the output repeatability of the flexible sensor under the dynamic alternating load was 5.03% and 0.78% lower than that of the static load, respectively. Combined with the static and dynamic experiments, it was verified that the polymer-based flexible sensor can maintain the same deformation characteristics with the measured object, and at the same time outputted a resistance signal with a certain mapping relationship with the applied load. The repeatability of the output signal under dynamic and static experiments was within ±7%, which can meet the measurement requirements of the fatigue life of the measured body during periodic load.

Development of circuit solution and design of capacitive pressure sensor array for applied robotics

2020 ◽  
Vol 8 (4) ◽  
pp. 296-307
Author(s):  
Konstantin Krestovnikov ◽  
Aleksei Erashov ◽  
Аleksandr Bykov
Keyword(s):  
Pressure Sensor ◽  
Output Signal ◽  
Sensor Array ◽  
Applied Pressure ◽  
Pressure Sensors ◽  
Fine Tuning ◽  
Capacitive Pressure Sensor ◽  
Cell Parameters ◽  
Linear Pattern ◽  
Sensor Structure

This paper presents development of pressure sensor array with capacitance-type unit sensors, with scalable number of cells. Different assemblies of unit pressure sensors and their arrays were considered, their characteristics and fabrication methods were investigated. The structure of primary pressure transducer (PPT) array was presented; its operating principle of array was illustrated, calculated reference ratios were derived. The interface circuit, allowing to transform the changes in the primary transducer capacitance into voltage level variations, was proposed. A prototype sensor was implemented; the dependency of output signal power from the applied force was empirically obtained. In the range under 30 N it exhibited a linear pattern. The sensitivity of the array cells to the applied pressure is in the range 134.56..160.35. The measured drift of the output signals from the array cells after 10,000 loading cycles was 1.39%. For developed prototype of the pressure sensor array, based on the experimental data, the average signal-to-noise ratio over the cells was calculated, and equaled 63.47 dB. The proposed prototype was fabricated of easily available materials. It is relatively inexpensive and requires no fine-tuning of each individual cell. Capacitance-type operation type, compared to piezoresistive one, ensures greater stability of the output signal. The scalability and adjustability of cell parameters are achieved with layered sensor structure. The pressure sensor array, presented in this paper, can be utilized in various robotic systems.

scholarly journals Design and Manufacture of Data Gloves for Rehabilitation Training and Gesture Recognition Based on Flexible Sensors

2021 ◽  
Vol 2021 ◽  
pp. 1-9
Author(s):  
Kai Guo ◽  
Senhao Zhang ◽  
Shasha Zhao ◽  
Hongbo Yang
Keyword(s):  
Experimental Data ◽  
Gesture Recognition ◽  
The Self ◽  
Hand Rehabilitation ◽  
Data Glove ◽  
Flexible Sensors ◽  
Rehabilitation Training ◽  
Flexible Sensor ◽  
The Core ◽  
Design And Manufacture

This work takes the production and usage scenarios of the data glove as the research object and studies the method of applying the flexible sensor to the data glove. Many studies are also devoted to exploring the transplantation of flexible sensors to data gloves. However, this type of research still lacks the display of specific application scenarios such as gesture recognition or hand rehabilitation training. A small amount of experimental data and theoretical analysis are difficult to promote the development of flexible sensors and flexible data gloves design schemes. Therefore, this study uses the self-made flexible sensor of the research group as the core sensing unit to produce a flexible data glove to monitor the bending changes of the knuckles and then use it for simple gesture recognition and rehabilitation training.

scholarly journals Continuous In Vivo Monitoring of a Flexible Subcutaneous Sensor in Freely Moving Diabetic Rats

2008 ◽  
Vol 2 (2) ◽  
Author(s):  
Spencer Thomas ◽  
Robert Hitchcock
Keyword(s):  
Subcutaneous Tissue ◽  
Diabetic Rats ◽  
Tissue Response ◽  
Flexible Sensors ◽  
Flexible Sensor ◽  
Low Stiffness ◽  
Freely Moving ◽  
Similar Accuracy

Subcutaneous tissue is frequently the target site for placement of continuous, real-time metabolic sensors. Since the 1960s, numerous research groups have developed needle-like sensor designs, patterned after the Clarke Electrode, to monitor glucose in subcutaneous tissue. These designs perform well in vitro but often fail in vivo due to sensor instability and tissue response. None of these studies focused on the mechanical properties of implanted sensors and how these properties may affect in vivo performance. To investigate the role of sensor stiffness on short term functionality we developed a low stiffness subcutaneous sensor patterned after the Clarke Electrode and tested it in rodents. The purpose of this study was two-fold. The first goal was to demonstrate the in vivo functionality of the flexible sensor. The second goal was to evaluate the effect of stiffness on functionality by co-implanting stiff and flexible sensors. In the first series of studies the low stiffness sensors provided glucose level measurements that fell within the A and B regions of the Clarke Error Grid 93.0% of the time. The results of the second study yielded similar accuracy; however, no performance difference was seen between the stiff and flexible sensors. We concluded that the flexible sensor works for at least 3days after implantation in the subcutaneous tissue of freely moving rats and that the key property of low stiffness has no differential effect on the accuracy of the sensor in the freely moving rodent model of these studies.

scholarly journals A Self-Powered Portable Flexible Sensor of Monitoring Speed Skating Techniques

Biosensors ◽  
2021 ◽  
Vol 11 (4) ◽  
pp. 108
Author(s):  
Zhuo Lu ◽  
Yongsheng Zhu ◽  
Changjun Jia ◽  
Tianming Zhao ◽  
Meiyue Bian ◽  
...  
Keyword(s):  
Big Data ◽  
Polyvinylidene Fluoride ◽  
Flexible Sensors ◽  
Flexible Sensor ◽  
User Training ◽  
Speed Skating ◽  
Sport Industry ◽  
Sensor Signals ◽  
External Power ◽  
Self Powered

With the development of 5G technology, contemporary technologies such as Internet of Things (IoT) and Big Data analyses have been widely applied to the sport industry. This paper focuses on the design of a portable, self-powered, flexible sensor, which does not require an external power supply. The sensor is capable of monitoring speed skating techniques, thereby helping professional athletes to enhance their performance. This sensor mainly consists of Polyvinylidene Fluoride (PVDF) with polarization after a silvering electrode and a flexible polyester substrate. Flexible sensors are attached to the push-off joint part of speed skaters and the ice skate blade. During motion, it produces different piezoelectricity signals depending on the states of motion. The monitoring and analyzing of the real-time sensor signals will adjust the athlete’s skating angle, frequency, and push-off techniques, thus improving user training and enhancing performance. Moreover, the production of piezoelectric signals can charge the capacitor, provide power for small electronic equipment (e.g., wireless device), and extend the applications of wearable flexible sensors to the Big Data and IoT technologies in the sport industry.

Improved Resolution in A P-I-N Image Sensor by Changing the Structure of the Doped Layers

2000 ◽  
Vol 609 ◽  
Author(s):  
M. Vieira ◽  
M. Fernandes ◽  
J. Martins ◽  
P. Louro ◽  
A. Maçarico ◽  
...  
Keyword(s):  
Short Circuit ◽  
Short Circuit Current ◽  
Image Sensor ◽  
Geometric Distortion ◽  
Small Signal ◽  
Current Signal ◽  
Image Processing Algorithm ◽  
Trade Off ◽  
Sensor Structure ◽  
Output Characteristics

ABSTRACTAn amorphous ZnO/p-i-n/Al imager that uses a small-signal scanning beam to read out the short circuit current signal is presented. An analysis of the image geometric distortion, restoration, and enhancement is performed. A simple image-processing algorithm is used to recover main features of projected images. Modifications of the transducer structure are proposed for improving the sensor performance.The effect of the doped layers and image intensity on the sensor output characteristics are analysed. Results show that a trade-off between the sensor structure and contact geometry is needed for a correct read-out. Algorithms and tools are proposed for image analysis.

scholarly journals Study on Direct Writing of Gallium Metal for the Flexible Sensor

2021 ◽  
Vol 2021 ◽  
pp. 1-10
Author(s):  
Junfeng Liu ◽  
Haopeng Ma ◽  
Yong Yang ◽  
Weimin Yang ◽  
Zhiwei Jiao ◽  
...  
Keyword(s):  
Flow Characteristics ◽  
Specific Reference ◽  
Direct Writing ◽  
Flexible Sensors ◽  
Driving Mode ◽  
Flexible Sensor ◽  
Nozzle Height ◽  
Gallium Metal ◽  
Inner Diameter ◽  
Piston Mode

There is an urgent need for a simple and effective method to manufacture flexible sensors composed of liquid metal. Gallium (Ga) metal has become an ideal flexible conductive material due to its high conductivity, low melting point, and high flow characteristics. In this paper, liquid Ga metal is directly written on the polyvinyl alcohol (PVA) film through the driving mode of piston extrusion; then, the Ga metal wire is transferred and sealed with silica gel. The advantages of piston mode are studied, and the direct writing parameters of the liquid Ga metal, including extrusion speed, nozzle height, printing speed, and nozzle inner diameter, are systematically optimized. The flexible sensor based on the sealed liquid Ga metal has good resilience under the external load. This work provides a specific reference for direct writing of liquid Ga metal and its sealing technology for the flexible sensor.

scholarly journals Modular protein-oligonucleotide signal exchange

2019 ◽  
Author(s):  
Deepak K. Agrawal
Keyword(s):  
Real Time ◽  
Output Signal ◽  
Point Of Care ◽  
Specific Protein ◽  
Dna Oligonucleotides ◽  
Exchange Processes ◽  
Dna Strand Displacement ◽  
Displacement Reactions ◽  
Biochemical Systems ◽  
Output Characteristics

ABSTRACTThe ability to detect a protein selectively and produce a predicted signal in real time is a long-lasting engineering challenge in the field of biochemistry. Such a mechanism typically requires a sensing module to recognize the input protein and a translation module to produce a programmable output signal that reflects the concentration of the input. Here we present a generic biomolecular reaction process that exchanges the concentration of an input protein with a DNA oligonucleotide. This approach uses the unique characteristic of DNA oligonucleotide aptamer that can either bind to a specific protein or to a complementary DNA oligonucleotide reversibly. We then pass the information of the protein concentration to the output signal through DNA strand displacement reactions. Using this strategy, we design and characterize four different exchange processes that can produce modular DNA oligonucleotides in response to different proteins such as clinically important human α-thrombin and vascular endothelial growth factor (VEGF). These exchange processes are capable of real time sensing and are modular such that they can be used for concurrent detection of different proteins with well-defined input-output characteristics. The novelty and simplicity of our approach encourage to develop advanced biochemical systems for point-of-care testing of infectious diseases and treatments.

Intelligent Quilt Based on Conductive Textile Materials, Smart Flexible Sensors, and Composite Charging Technology

2014 ◽  
Vol 607 ◽  
pp. 926-930
Author(s):  
Jin Liang Li ◽  
Li Ping Zhu
Keyword(s):  
Gas Detection ◽  
Trace Gas ◽  
Genetic Technology ◽  
Flexible Sensors ◽  
Textile Materials ◽  
Flexible Sensor ◽  
Current Conduction ◽  
New Energy ◽  
Conductive Textile ◽  
Unique Signal

In this paper, domestic and foreign progress and some of the results obtained in the field of conductive textile research are introduced. An intelligent quilt concept is conceived. The intelligent quilt is made from natural plant improved by genetic technology. It has certain “conductivity”, which is not necessarily the true current conduction, but may be the conduction of some weak “unique signal” sent out by some specially bred textile fibers organization. The research results of flexible sensor are applied to trace gas detection in the intelligent quilt. Also, new energy supply strategy with combination of. Bioenergy technologies and other energy are employed. The proposed intelligent quilt may be applied to the monitoring biochemical and autonomic parameters of the human body and provide helpful suggestions on people’s health status.

Skin-conformal MXene-doped wearable sensors with self-adhesive, dual-mode sensing, and high sensitivity for human motions and wireless monitoring

2021 ◽  
Author(s):  
Yuegang Sun ◽  
Shuang Wang ◽  
Xiaosheng Du ◽  
Haibo Wang ◽  
xu Cheng ◽  
...  
Keyword(s):  
Information Acquisition ◽  
Wearable Sensors ◽  
High Sensitivity ◽  
Dual Mode ◽  
Flexible Sensors ◽  
Wireless Monitoring ◽  
Flexible Sensor ◽  
High Toughness ◽  
Human Motions

Flexible sensors have attracted extensive attention due to their excellent flexibility, biocompatibility, and information acquisition accuracy. Therefore, it is desired to fabricate a flexible sensor with high toughness and sensitivity...

scholarly journals A knitted wearable flexible sensor for monitoring breathing condition

2020 ◽  
Vol 15 ◽  
pp. 155892502093035 ◽  
Author(s):  
Jinfeng Wang ◽  
Saeid Soltanian ◽  
Peyman Servati ◽  
Frank Ko ◽  
Ming Weng
Keyword(s):  
Health Condition ◽  
Actual Condition ◽  
Flexible Sensors ◽  
Flexible Sensor ◽  
Sensor Resistance ◽  
Normal Breathing ◽  
Signal Collection ◽  
Spun Yarn ◽  
Shallow Breathing ◽  
Slow Breathing

This article presents the development of a knitted flexible sensor, which is embedded into a seamless garment, for monitoring health condition. The sensor is designed as an elastic weft-knitted plain structure, where the conductive silver-plating filament yarn is used for breathing signal collection and the spandex core-spun yarn is used to ensure good attachment of the garment to human body. The breathing amplitude and breathing frequency are obtained from the variations in sensor resistance. The sensor can measure various kinds of breathing conditions, such as normal breathing, slow breathing, fast breathing, and shallow breathing. The results are in reasonable agreement with the actual condition. Such kind of flexible sensors have the advantages of wearable and comfort.

Sign in / Sign up

Export Citation Format

Share Document