Piezoelectric film transducer for recording of oculography in electro-encephalogram-polygraphy

Accurate determination of piezoelectric properties such as piezoelectric charge coefficients (d33) is an essential step in the design process of sensors and actuators using piezoelectric effect. In this study, a cost-effective and accurate method based on dynamic loading technique was proposed to determine the piezoelectric charge coefficient d33. Finite element analysis (FEA) model was developed in order to estimate d33 and validate the obtained values with experimental results. The experiment was conducted on a piezoelectric disc with a known d33 value. The effect of measuring boundary conditions, substrate material properties and specimen geometry on measured d33 value were conducted. The experimental results reveal that the determined d33 coefficient by this technique is accurate as it falls within the manufactures tolerance specifications of PZT-5A piezoelectric film d33. Further, obtained simulation results on fibre reinforced and particle reinforced piezoelectric composite were found to be similar to those that have been obtained using more advanced techniques. FE-results showed that the measured d33 coefficients depend on measuring boundary condition, piezoelectric film thickness, and substrate material properties. This method was proved to be suitable for determination of d33 coefficient effectively for piezoelectric samples of any arbitrary geometry without compromising on the accuracy of measured d33.

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Study of the Properties of a Hybrid Piezoelectric and Electromagnetic Energy Harvester for a Civil Engineering Low-Frequency Sloshing Environment

Energies ◽

10.3390/en14020391 ◽

2021 ◽

Vol 14 (2) ◽

pp. 391

Author(s):

Nan Wu ◽

Yuncheng He ◽

Jiyang Fu ◽

Peng Liao

Keyword(s):

Output Power ◽

Energy Harvester ◽

Civil Engineering ◽

Maximum Output Power ◽

Low Frequency ◽

Electromagnetic Energy ◽

Maximum Output ◽

Piezoelectric Film ◽

Hybrid Energy ◽

Level Height

In this paper a novel hybrid piezoelectric and electromagnetic energy harvester for civil engineering low-frequency sloshing environment is reported. The architecture, fabrication and characterization of the harvester are discussed. The hybrid energy harvester is composed of a permanent magnet, copper coil, and PVDF(polyvinylidene difluoride) piezoelectric film, and the upper U-tube device containing a cylindrical fluid barrier is connected to the foundation support plate by a hinge and spring. The two primary means of energy collection were through the vortex street, which alternately impacted the PVDF piezoelectric film through fluid shedding, and the electromotive force (EMF) induced by changes in the magnetic field position in the conducting coil. Experimentally, the maximum output power of the piezoelectric transformer of the hybrid energy harvester was 2.47 μW (circuit load 270 kΩ; liquid level height 80 mm); and the maximum output power of the electromagnetic generator was 2.72 μW (circuit load 470 kΩ; liquid level height 60 mm). The low-frequency sloshing energy collected by this energy harvester can drive microsensors for civil engineering monitoring.

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A PVDF piezoelectric film sensor for measuring transformer short-circuit force

2020 IEEE International Conference on Applied Superconductivity and Electromagnetic Devices (ASEMD) ◽

10.1109/asemd49065.2020.9276375 ◽

2020 ◽

Author(s):

Tiannan Meng ◽

Bingbing Hou ◽

Xuejuan Zhang ◽

Yongteng Jing ◽

Yan Li

Keyword(s):

Short Circuit ◽

Piezoelectric Film ◽

Film Sensor

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Novel Design for Optical Scanner with Piezoelectric Film Deposited by Metal Organic Chemical Vapor Deposition

Japanese Journal of Applied Physics ◽

10.1143/jjap.49.04dl19 ◽

2010 ◽

Vol 49 (4) ◽

pp. 04DL19 ◽

Cited By ~ 6

Author(s):

Hirokazu Matsuo ◽

Yusuke Kawai ◽

Masayoshi Esashi

Keyword(s):

Chemical Vapor Deposition ◽

Vapor Deposition ◽

Chemical Vapor ◽

Organic Chemical ◽

Piezoelectric Film ◽

Optical Scanner ◽

Metal Organic ◽

Organic Chemical Vapor Deposition ◽

Novel Design

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A Flextensional Transducer Prototype with PVDF Piezoelectric Film

Applied Mechanics and Materials ◽

10.4028/www.scientific.net/amm.670-671.1153 ◽

2014 ◽

Vol 670-671 ◽

pp. 1153-1158

Author(s):

Jing Jing Liu ◽

Lei Qin ◽

Li Kun Wang ◽

Chao Zhong ◽

Bin Zhang ◽

...

Keyword(s):

Polyvinylidene Fluoride ◽

Laser Scanning ◽

Longitudinal Vibration ◽

Voltage Response ◽

Acoustic Measurement ◽

Piezoelectric Film ◽

Radial Vibration ◽

Frequency Bandwidth ◽

Metallic Shell ◽

Flextensional Transducer

This paper presents a prototype of a new flextensional transducer with PVDF (Polyvinylidene Fluoride) piezoelectric film instead of metallic shell. Resonance frequency, bandwidth, transmitting voltage response, and horizontal directivity of the flextensional transducer with PVDF piezoelectric film were respectively measured by using laser-scanning vibrometer, and underwater acoustic measurement system. Experimental results showed that the new transducer features effectively conversion from longitudinal vibration of piezoelectric stack into radial vibration of PVDF piezoelectric film.

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