Development Of PVDF Thick Film Interdigitated Capacitors For Pressure Measurement On Flexible Melinex Substrates

2005 ◽  
Vol 870 ◽  
Author(s):  
Arous Arshak ◽  
Khalil Arshak ◽  
Deirdre Morris ◽  
Olga Korostynska ◽  
Essa Jafer
Keyword(s):  
Polymer Film ◽  
Thick Film ◽  
Pressure Measurement ◽  
Pressure Sensors ◽  
High Sensitivity ◽  
Strain Gauges ◽  
Interdigitated Electrodes ◽  
Higher Sensitivity

AbstractIn this work, a PVDF thick film paste was deposited onto interdigitated electrodes to form a capacitor. Two different substrates, alumina and Melinex® were used. Capacitors, fabricated on alumina substrates were tested as strain gauges, and showed a high sensitivity with low hysteresis. Capacitors on Melinex® substrates were tested as pressure sensors by adhering them to planar and cylindrical surfaces and subjecting them to pressures up to 300 kPa. Their sensitivity and hysteresis during cycling were examined and compared. It was found that sensors on cylindrical surfaces showed a higher sensitivity, however the hysteresis was also increased. It is thought that this is due to instabilities in the polymer film, accentuated by stretching of the substrate.

scholarly journals Graded intrafillable architecture-based iontronic pressure sensor with ultra-broad-range high sensitivity

2020 ◽  
Vol 11 (1) ◽  
Author(s):  
Ningning Bai ◽  
Liu Wang ◽  
Qi Wang ◽  
Jue Deng ◽  
Yan Wang ◽  
...  
Keyword(s):  
Mechanical Stability ◽  
Pressure Sensors ◽  
High Sensitivity ◽  
Pressure Response ◽  
Ultrahigh Pressure ◽  
Response Range ◽  
Surface Microstructures ◽  
Pressure Regime ◽  
Flexible Pressure Sensors ◽  
Higher Sensitivity

AbstractSensitivity is a crucial parameter for flexible pressure sensors and electronic skins. While introducing microstructures (e.g., micro-pyramids) can effectively improve the sensitivity, it in turn leads to a limited pressure-response range due to the poor structural compressibility. Here, we report a strategy of engineering intrafillable microstructures that can significantly boost the sensitivity while simultaneously broadening the pressure responding range. Such intrafillable microstructures feature undercuts and grooves that accommodate deformed surface microstructures, effectively enhancing the structural compressibility and the pressure-response range. The intrafillable iontronic sensor exhibits an unprecedentedly high sensitivity (Smin > 220 kPa−1) over a broad pressure regime (0.08 Pa-360 kPa), and an ultrahigh pressure resolution (18 Pa or 0.0056%) over the full pressure range, together with remarkable mechanical stability. The intrafillable structure is a general design expected to be applied to other types of sensors to achieve a broader pressure-response range and a higher sensitivity.

A Methane Sensor Based on Poly[3',4'-dihexyl-4,4''-bis(pentyloxy)-2,2':5',2''-terthiophene]

2003 ◽  
Vol 68 (9) ◽  
pp. 1736-1744 ◽  
Author(s):  
Giuseppe Casalbore-Miceli ◽  
Alberto Zanelli ◽  
Alessandro Geri ◽  
Maria C. Gallazzi
Keyword(s):  
Response Time ◽  
Polymer Film ◽  
Square Root ◽  
Interdigitated Electrodes ◽  
Methane Sensor ◽  
Impedance Variation ◽  
Concentration Step ◽  
Charge Hopping ◽  
Methane Concentrations ◽  
Higher Sensitivity

3',4'-Dihexyl-4,4''-bis(pentyloxy)-2,2':5',2''-terthiophene was electrochemically polymerized on gold interdigitated electrodes to investigate the impedance variation of the polymer in the exposure to air/methane atmospheres. The higher sensitivity of poly[3',4'-dihexyl-4,4''-bis(pentyloxy)2,2';5',2''-terthiophene] (PHPT) to methane was observed at frequencies of about 100 Hz. The PHPT impedance decreases when the CH4 concentration increases and shows the highest sensitivity at the lowest methane concentrations. After each concentration step, the impedance decreased as the square root of time indicating that the response time of the PHPT-based sensor was controlled by diffusion of the gas into the material. It is suggested that the absorption of methane into the polymer film affects the rate of interchain charge hopping.

scholarly journals Silicon whisker pressure sensors for noise reduction in silencers

2021 ◽  
pp. 28-32
Author(s):  
A. A. Druzhinin ◽  
A. P. Kutrakov ◽  
R. V. Zinko
Keyword(s):  
Noise Suppression ◽  
Combustion Engine ◽  
Pressure Sensors ◽  
Low Frequency ◽  
High Sensitivity ◽  
Strain Gauges ◽  
Active System ◽  
Operating Modes ◽  
Noise Characteristics ◽  
Active Noise

The article contains the results of research and development of a system for active noise damping of an automobile engine. The main source of noise from a running engine is exhaust noise. The frequency spectrum of this sound has a pronounced low-frequency character, which explains its weak absorption when the sound is propagating in open spaces. A possible solution to this problem is to use an active system for suppressing the resonant frequencies of the muffler using strain gauges to read the primary information about the dynamic processes that determine the noise level. It is for such active noise suppression systems that the authors develop a high-temperature pressure sensor based on strain gauges made of silicon whiskers. Such strain gauges have unique mechanical properties, are characterized by high sensitivity and the ability to operate in various amplitude-frequency and temperature ranges up to 500℃. The study of the dynamic characteristics of pressure sensors made it possible to confirm the quality of its electromechanical part and determine that the measurement error of the sensor is ±0.5 in the temperature range of 20 to 500℃. The active noise suppression system is a buffer tank whose volume changes in accordance with signals from pressure sensors. This design makes it possible to dynamically change the resonant frequency of the buffer capacitance depending on the operating modes of the engine, which leads to a decrease in its noise characteristics. Using the developed additional resonator chamber with a variable volume in the exhaust muffler of an internal combustion engine made it possible to reduce resonance phenomena in the zone of low-frequency pulsations of the exhaust gas pressure from 57 to 43 Hz with a frequency drift in the range of 310 to 350 Hz, which significantly improved its noise characteristics.

Development of high sensitivity oxide based strain gauges and pressure sensors

2006 ◽  
Vol 17 (9) ◽  
pp. 767-778 ◽  
Author(s):  
K. Arshak ◽  
D. Morris ◽  
A. Arshak ◽  
O. Korostynska
Keyword(s):  
Pressure Sensors ◽  
High Sensitivity ◽  
Strain Gauges

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 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.

Development of Metallic Digital Strain Gauges

2004 ◽  
Vol 1-2 ◽  
pp. 179-184 ◽  
Author(s):  
T. Yan ◽  
B.E. Jones ◽  
R.T. Rakowski ◽  
M.J. Tudor ◽  
S.P. Beeby ◽  
...  
Keyword(s):  
Thick Film ◽  
Low Cost ◽  
Pressure Sensors ◽  
Piezoelectric Sensor ◽  
Digital Processing ◽  
Strain Gauges ◽  
Etching Technique ◽  
Beam Resonator ◽  
Resonator Structure ◽  
Wide Range

A joint Brunel-Southampton Universities’ research team has developed digital strain gauges based on a metallic triple-beam resonator structure with thick-film piezoelectric sensor elements. The resonator, an oscillating structure vibrating at resonance, is designed such that its resonant frequency is a function of the measurand. The resonator substrate was fabricated by a double-sided photochemical etching technique and the thick-film piezoelectric elements were deposited by a standard screen-printing process. The new metallic digital strain gauges can be used on stiff structures, have high overload capacities, low power consumption, frequency output for digital processing, and offer prospects for wireless-batteryless operation. The device can be easily mass-produced at low cost for use in a wide range of measuring systems, e.g. load cells, weighing machines, torque transducers and pressure sensors.

scholarly journals Giant gauge factor of Van der Waals material based strain sensors

2021 ◽  
Vol 12 (1) ◽  
Author(s):  
Wenjie Yan ◽  
Huei-Ru Fuh ◽  
Yanhui Lv ◽  
Ke-Qiu Chen ◽  
Tsung-Yin Tsai ◽  
...  
Keyword(s):  
Carrier Mobility ◽  
Large Range ◽  
Van Der Waals ◽  
High Sensitivity ◽  
Strain Sensors ◽  
Strain Gauges ◽  
Gauge Factor ◽  
Proof Of Concept ◽  
High Flexibility ◽  
Small Deformations

AbstractThere is an emergent demand for high-flexibility, high-sensitivity and low-power strain gauges capable of sensing small deformations and vibrations in extreme conditions. Enhancing the gauge factor remains one of the greatest challenges for strain sensors. This is typically limited to below 300 and set when the sensor is fabricated. We report a strategy to tune and enhance the gauge factor of strain sensors based on Van der Waals materials by tuning the carrier mobility and concentration through an interplay of piezoelectric and photoelectric effects. For a SnS2 sensor we report a gauge factor up to 3933, and the ability to tune it over a large range, from 23 to 3933. Results from SnS2, GaSe, GeSe, monolayer WSe2, and monolayer MoSe2 sensors suggest that this is a universal phenomenon for Van der Waals semiconductors. We also provide proof of concept demonstrations by detecting vibrations caused by sound and capturing body movements.

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