scholarly journals Research Papers. An Approach to Design Broadband Air Backed Piezoelectric Sensor

2015 ◽  
Vol 40 (1) ◽  
pp. 3-10
Author(s):  
Mohamed G.S. Ali ◽  
Nour Z. Elsayed ◽  
Ebtsam A. Eid
Keyword(s):  
Impulse Response ◽  
Piezoelectric Transducer ◽  
High Sensitivity ◽  
Piezoelectric Sensor ◽  
Time Signal ◽  
Research Papers ◽  
Time Model ◽  
Water Load ◽  
Quarter Wavelength ◽  
Thickness Mode

Abstract In this work, an approach to the design of broadband thickness-mode piezoelectric transducer is pre- sented. In this approach, simulation of discrete time model of the impulse response of matched and backed piezoelectric transducer is used to design high sensitivity, broad bandwidth, and short-duration impulse response transducers. The effect of matching the performance of transmitting and receiving air backed PZT-5A transducer working into water load is studied. The optimum acoustical characteristics of the quarter wavelength matching layers are determined by a compromise between sensitivity and pulse duration. The thickness of bonding layers is smaller than that of the quarter wavelength matching layers so that they do not change the resonance peak significantly. Our calculations show that the −3 dB air backed transducer bandwidth can be improved considerably by using quarter wavelength matching layers. The computer model developed in this work to predict the behavior of multilayer structures driven by a transient waveform agrees well with measured results. Furthermore, the advantage of this this model over other approaches is that the time signal for optimum set of matching layers can be predicted rapidly

scholarly journals An Active Self-Driven Piezoelectric Sensor Enabling Real-Time Respiration Monitoring

Sensors ◽  
2019 ◽  
Vol 19 (14) ◽  
pp. 3241 ◽  
Author(s):  
Ahmed Rasheed ◽  
Emad Iranmanesh ◽  
Weiwei Li ◽  
Yangbing Xu ◽  
Qi Zhou ◽  
...  
Keyword(s):  
Real Time ◽  
Piezoelectric Transducer ◽  
Thin Film Transistor ◽  
High Sensitivity ◽  
Piezoelectric Sensor ◽  
Great Promise ◽  
Dynamic Force ◽  
Respiration Monitoring ◽  
Respiration Rhythm ◽  
Transducer Signal

In this work, we report an active respiration monitoring sensor based on a piezoelectric-transducer-gated thin-film transistor (PTGTFT) aiming to measure respiration-induced dynamic force in real time with high sensitivity and robustness. It differs from passive piezoelectric sensors in that the piezoelectric transducer signal is rectified and amplified by the PTGTFT. Thus, a detailed and easy-to-analyze respiration rhythm waveform can be collected with a sufficient time resolution. The respiration rate, three phases of respiration cycle, as well as phase patterns can be further extracted for prognosis and caution of potential apnea and other respiratory abnormalities, making the PTGTFT a great promise for application in long-term real-time respiration monitoring.

Analysis of AC-DC Converter Circuit Performance with Difference Piezoelectric Transducer Array Connection

2020 ◽  
Vol 12 (7) ◽  
Author(s):  
Nik Ahmad Zainal Abidin ◽  
◽  
Norkharziana Mohd Nayan ◽  
Azuwa Ali ◽  
N. A. Azli ◽  
...  
Keyword(s):  
Piezoelectric Transducer ◽  
Simulation Analysis ◽  
Piezoelectric Sensor ◽  
Transducer Array ◽  
Circuit Performance ◽  
Array Configuration ◽  
Full Wave ◽  
Bridge Rectifier ◽  
In Series ◽  
Parallel Voltage

This research presents a simulation analysis for the AC-DC converter circuit with a different configurations of the array connection of the piezoelectric sensor. The selection of AC-DC converter circuits is full wave bridge rectifier (FWBR), parallel SSHI (P-SSHI) and parallel voltage multiplier (PVM) with array configuration variation in series (S), parallel (P), series-parallel (SP) and parallel-series (PS). The system optimizes with different load configurations ranging from 10 kΩ to 1 MΩ. The best configuration of AC-DC converter with an appropriate array piezoelectric connection producing the optimum output of harvested power is presented. According to the simulation results, the harvested power produced by using P-SSHI converter connected with 3 parallel piezoelectric transducer array was 85.9% higher than for PVM and 15.88% higher than FWBR.

Flexible Fibrous Piezo-Electric Sensor on Printed Silver Electrode

2014 ◽  
Vol 1685 ◽  
Author(s):  
Ho Yeon Son ◽  
Yoon Sung Nam ◽  
Woo Soo Kim
Keyword(s):  
Vinylidene Fluoride ◽  
Silver Nanowires ◽  
High Sensitivity ◽  
Cost Effective ◽  
Piezoelectric Sensor ◽  
Piezoelectric Sensors ◽  
Mechanical Stimuli ◽  
Aligned Arrays ◽  
Poly Vinylidene Fluoride ◽  
Facile Fabrication

ABSTRACTHere we introduce a facile method to fabricate a flexible piezoelectric sensor using one-dimensional (1-D) piezoelectric poly(vinylidene fluoride) (PVDF) nanofibers directly produced onto flexible printed electrodes by electro-spinning without an additional poling process. The flexible silver electrodes are fabricated on polyethylene terephthalate (PET) using silver nanowires by easy and cost-effective spraying deposition. The electrospun PVDF nanofibers have uniaxially aligned arrays on the electrodes by using a rotating collector. The fabricated PVDF piezoelectric sensors demonstrate the piezoelectric responses with repeated mechanical stimuli with good flexibility and high sensitivity. We expect that the facile fabrication of PVDF piezoelectric sensors on flexible printed electrodes can be usefully exploited to integrate the piezoelectric sensors into flexible and stretchable functional electronic devices.

scholarly journals Piezoelectric sensor based on graphene-doped PVDF nanofibers for sign language translation

2020 ◽  
Vol 11 ◽  
pp. 1655-1662
Author(s):  
Shuai Yang ◽  
Xiaojing Cui ◽  
Rui Guo ◽  
Zhiyi Zhang ◽  
Shengbo Sang ◽  
...  
Keyword(s):  
Sign Language ◽  
Polyvinylidene Fluoride ◽  
Motion Tracking ◽  
Language Translation ◽  
High Sensitivity ◽  
Piezoelectric Sensor ◽  
Body Motion ◽  
Sensing System ◽  
Gesture Control ◽  
Self Powered

The tracking of body motion, such as bending or twisting, plays an important role in modern sign language translation. Here, a subtle flexible self-powered piezoelectric sensor (PES) made of graphene (GR)-doped polyvinylidene fluoride (PVDF) nanofibers is reported. The PES exhibits a high sensitivity to pressing and bending, and there is a stable correlation between bending angle and piezoelectric voltage. The sensitivity can be adjusted by changing the doping concentration of GR. Also, when the PES contacts a source of heat, a pyroelectric signal can be acquired. The positive correlation between temperature and signal can be used to avoid burns. The integrated sensing system based on multiple PESs can accurately recognize the action of each finger in real time, which can be effectively applied in sign language translation. PES-based motion-tracking applications have been effectively used, especially in human–computer interaction, such as gesture control, rehabilitation training, and auxiliary communication.

A systems model of the thickness mode piezoelectric transducer

1984 ◽  
Vol 76 (2) ◽  
pp. 369-382 ◽  
Author(s):  
G. Hayward ◽  
C. J. MacLeod ◽  
T. S. Durrani
Keyword(s):  
Piezoelectric Transducer ◽  
Systems Model ◽  
Thickness Mode
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