Development and Application of Piezoelectric Materials for Ultrasound Generation and Detection

Ultrasound ◽  
2011 ◽  
Vol 19 (4) ◽  
pp. 187-196 ◽  
Author(s):  
Amir Manbachi ◽  
Richard S C Cobbold
Keyword(s):  
Microelectromechanical Systems ◽  
Piezoelectric Effect ◽  
Piezoelectric Materials ◽  
Electrical Energy ◽  
Medical Ultrasound ◽  
Piezoelectric Surgery ◽  
Primary Means ◽  
History Of ◽  
Ultrasound Applications ◽  
Acoustical Energy

The piezoelectric effect and its converse are the primary means used in biomedical ultrasound for converting acoustical energy into electrical energy and vice versa. Piezoelectricity has found many bioengineering applications ranging from ultrasound imaging and therapeutics, to piezoelectric surgery and microelectromechanical systems, and to biomedical implants with associated energy harvesting. Because of its fundamental importance to the proper functioning of most medical ultrasound systems, it is important to gain a general understanding of the effect, the history of its development and from this, an appreciation of its limitations and advantages in the generation and detection of ultrasound. This article describes the historical evolvement associated with its use in relation to most medical ultrasound applications and is intended to serve as an introduction for non-expert readers.

scholarly journals Implementation of raindrops energy collector board using piezoelectric transducer

2018 ◽  
Vol 197 ◽  
pp. 11011
Author(s):  
Eka Defiyani ◽  
Porman Pangaribuan ◽  
Denny Darlis
Keyword(s):  
Lead Zirconate Titanate ◽  
Piezoelectric Transducer ◽  
Piezoelectric Effect ◽  
Piezoelectric Materials ◽  
Mechanical Strain ◽  
Electrical Energy ◽  
Lead Zirconate ◽  
Electric Voltage ◽  
Tropical Area ◽  
Pierre Curie

Indonesia is a country that has a fairly high rainfall, because it is located in the tropical area. This condition could be a potential for generating electrical energy from raindrops. If the heavy raindrop collide the piezoelectric materials, it can generate electrical energy. The piezoelectric effect was discovered by Jacques and Pierre Curie in 1880. They found that certain materials, when subjected to mechanical strain, suffered an electrical polarization that was proportional to the applied strain. This piezoelectric effect converts mechanical strain into electrical voltage. The molecular structure of piezoelectric materials produces a coupling between electrical and mechanical domains. In this research, raindrops will be exploited to produce electric voltage by piezoelectric transducer. Piezoelectric transducer used in this research is Lead Zirconate Titanate type. Energy conversion processing occurred when raindrop collide the polymer layer of piezoelectric and make an unelastic thrust on its surface. The designed system consists of raindrops collector board and serial connected piezoelectric transducer. From system above, highest voltage, reach is 3.13 VAC for 30 piezoelectric and the average voltage is 2.617 V. This results show us the potential usage of raindrops energy generator using piezoelectric transducer for tropical countries.

Study of the Manufacture about Piezoelectric Nanogenerator under Micro Vibration and its Performance

2011 ◽  
Vol 105-107 ◽  
pp. 2109-2112
Author(s):  
Jian Guo Sheng ◽  
Ping Zeng ◽  
Can Can Zhang
Keyword(s):  
Piezoelectric Materials ◽  
Science And Technology ◽  
Electrical Energy ◽  
Ambient Vibration ◽  
Magnetic Line ◽  
Vibration Condition ◽  
Working Principle ◽  
Commercial Value ◽  
Micro Vibration ◽  
Piezoelectric Nanogenerators

With the development of science and technology, the smaller sizes generator, the more attention by people. The main purpose of this article is to manufacture piezoelectric nanogenerator under micro vibration and its working principle is introduced and its performance is studied. The results show that, using the present nanomaterials, piezoelectric materials can be prepared. When its wind in copper laps, under the situation of micro pulse vibration its can turn into electrical energy, thus yield piezoelectric nanogenerators. In ambient vibration condition, piezoelectric materials produce larger rated current and voltage. However, copper laps cutting magnetic line of force produce less rated current and voltage. So the piezoelectric nanogenerators can be separately used to supply power. If multiple piezoelectric nanogenerator in tandem may produce higher voltage, current and power, which possess commercial value.

Religion and Politics in Contemporary Turkey

2021 ◽  
Author(s):  
Ateş Altınordu
Keyword(s):  
Religion And Politics ◽  
Political Incorporation ◽  
Turkish Politics ◽  
Primary Means ◽  
History Of ◽  
The Republic ◽  
Turkish State ◽  
Islamic Parties ◽  
The Impact ◽  
The Relationship

Religion and secularism have been central threads in Turkish politics throughout the history of the republic. This chapter focuses on three important aspects of the relationship between religion and politics in contemporary Turkey. First, it explores the political functions of the Directorate of Religious Affairs (Diyanet), a government agency that has served as the primary means for the implementation of the religious policies of the Turkish state. Second, it investigates the relations between Islamic communities, political parties, and the state and argues that the distinction between official and unofficial Islam that has informed much of the work on the Turkish religious field must be strongly qualified. Finally, the author focuses on the trajectory of political Islam in Turkey, critically reviewing the literature on the rise, political incorporation, and authoritarian turn of Islamic parties. The conclusion emphasizes the need for studies investigating the impact of politics on religiosity in Turkish society.

scholarly journals Environment pollution: The rise of militarism and terrorism in the Niger Delta of Nigeria

2014 ◽  
pp. 1-11
Author(s):  
Christian Madubuko
Keyword(s):  
Environmental Justice ◽  
Niger Delta ◽  
Oil Exploration ◽  
Environmental Laws ◽  
Oil Companies ◽  
The People ◽  
Oil Pipelines ◽  
Primary Means ◽  
History Of ◽  
To Receive

Oil was discovered in large quantities in Nigeria in 1956 and exploration began in the same year. Before oil, agriculture and fishing had assured the Niger Delta people of a bright future. Since 1956, oil has been extracted from the Niger Delta with destructive consequences on the environment, bringing about environmental degradation and destruction of the people’s primary means of livelihood. Land and water were badly polluted, and the health of the people affected because of leaks from oil pipelines, gas flaring and acid rains. Several petitions and non-violent protests by Delta communities, women and youth against environmental destruction failed to receive attention. Rather, opposition to peaceful protests earned the people military invasions of their communities, clampdowns and jailings. The rise of militarism and terrorism in the Niger Delta was the result of the Federal Government and Oil Companies’ clampdown on non-violent protests for environmental justice in the Niger Delta. This paper discusses the history of oil exploration in the Niger Delta, oil laws, effects of oil exploration in the region, and the rise of militants and terrorists in the area. The paper uses the term, ‘environmental Justice’ to denote unfair treatment and destruction of the Delta environment resulting from oil exploration, non implementation and enforcement of environmental laws and regulations, and abuse of human rights.The paper suggests solutions for peace in the Niger Delta.

scholarly journals Static Force Measurement Using Piezoelectric Sensors

2021 ◽  
Vol 2021 ◽  
pp. 1-8
Author(s):  
Kyungrim Kim ◽  
Jinwook Kim ◽  
Xiaoning Jiang ◽  
Taeyang Kim
Keyword(s):  
Surface Charge ◽  
Piezoelectric Effect ◽  
Force Measurement ◽  
Piezoelectric Materials ◽  
Force Sensor ◽  
Piezoelectric Sensors ◽  
Force Sensing ◽  
Static Force ◽  
Sensing Applications ◽  
Direct Piezoelectric Effect

In force measurement applications, a piezoelectric force sensor is one of the most popular sensors due to its advantages of low cost, linear response, and high sensitivity. Piezoelectric sensors effectively convert dynamic forces to electrical signals by the direct piezoelectric effect, but their use has been limited in measuring static forces due to the easily neutralized surface charge. To overcome this shortcoming, several static (either pure static or quasistatic) force sensing techniques using piezoelectric materials have been developed utilizing several unique parameters rather than just the surface charge produced by an applied force. The parameters for static force measurement include the resonance frequency, electrical impedance, decay time constant, and capacitance. In this review, we discuss the detailed mechanism of these piezoelectric-type, static force sensing methods that use more than the direct piezoelectric effect. We also highlight the challenges and potentials of each method for static force sensing applications.

scholarly journals A Method for Quantitatively Separating the Piezoelectric Component from the as-received "Piezoelectric" Signal

2021 ◽  
Author(s):  
Chaojie Chen ◽  
Shilong Zhao ◽  
Caofeng Pan ◽  
Yunlong Zi ◽  
Fangcheng Wang ◽  
...  
Keyword(s):  
Vinylidene Fluoride ◽  
Piezoelectric Effect ◽  
Piezoelectric Materials ◽  
Contact Electrification ◽  
Poly Vinylidene Fluoride ◽  
Implantable Electronics ◽  
The Time Domain ◽  
Electric Signals ◽  
Piezoelectric Devices ◽  
Piezoelectric Performance

Abstract Polymer-based piezoelectric devices are promising for developing future wearable force sensors, nanogenerators, and implantable electronics etc. The electric signals generated by them are often assumed as solely coming from piezoelectric effect. However, triboelectric signals originated from contact electrification between the piezoelectric devices and the contacted objects can produce non-negligible interfacial electron transfer, which is often combined with the piezoelectric signal to give a triboelectric-piezoelectric hybrid output, leading to an exaggerated measured “piezoelectric” signal. Herein, a simple and effective method is proposed for quantitatively identifying and extracting the piezoelectric charge from the hybrid signal. The triboelectric and piezoelectric parts in the hybrid signal generated by a poly(vinylidene fluoride)-based device are clearly differentiated, and their force and charge characteristics in the time domain are identified. This work presents an effective method to elucidate the true piezoelectric performance in practical measurement, which is crucial for evaluating piezoelectric materials fairly and correctly.

scholarly journals PIEZO BASED ELECTRIC POWER GENERATION USING 3- DIMENSIONAL MECHANICAL VIBRATIONS PRODUCED IN VEHICLES

2013 ◽  
pp. 133-138
Author(s):  
G.JITHENDRA NAIDU ◽  
K.PRANAY KUMAR REDDY ◽  
S.SIVA PRASAD
Keyword(s):  
Power Supply ◽  
Electromotive Force ◽  
Permanent Magnets ◽  
Piezoelectric Materials ◽  
Electrical Energy ◽  
Relative Displacement ◽  
Wireless Data ◽  
Magnet System ◽  
Mechanical Vibrations ◽  
Wireless Data Transmission

Due to advancement in the field of technology in recent years, wireless data transmission techniques are commonly used in electronic devices. For powering them we rely upon power supply through wires charging, else power may be supplied from batteries. But while travelling for longer distances continuously we may not be able to obtain power supply for these devices to operate or to recharge their batteries. So in order to operate them continuously we need a power source that provides continuous energy to operate these devices. The mechanical vibrations which are produced by the automobiles can be utilized as a source of energy for generating electrical energy that can be utilized by these electronic equipment to operate. These vibrations are produced by different vehicles around us which is going as a waste. This technique utilizes piezoelectric components where deformations produced by vibrations are directly converted to electrical charge via piezoelectric effect and principle of electromagnetic induction between coil and magnetic field which produces Electromotive force in the coil provided displacement to magnet by the vibrations. The piezoelectric materials and permanent magnets are used as energy conversion devices for converting mechanical vibrations to electrical energy. In this context, we introduced two methods and considered its output performance provided input vibrations, by using piezoelectric materials such as PZT for electro mechanical conversion using Mass-spring system as medium of conversion of force from vibrations applied on PZT materials and by using spring-magnet system where relative displacement of magnet with respect to coil, provided input vibrations generates Electromotive force in coil.

Wide Bandwidth Piezoelectric MEMS Energy Harvesting

2013 ◽  
Vol 1556 ◽  
Author(s):  
Ruize Xu ◽  
Sang-Gook Kim
Keyword(s):  
Structural Design ◽  
Microelectromechanical Systems ◽  
Piezoelectric Materials ◽  
Ambient Vibration ◽  
Wide Bandwidth ◽  
Frequency Spectra ◽  
Energy Harvesters ◽  
Reasonable Cost ◽  
Continuous Power ◽  
Near Future

ABSTRACTPiezoelectric Microelectromechanical Systems (MEMS) has been proven to be an attractive technology for harvesting small energy from the ambient vibration. Recent advancements in piezoelectric materials and harvester structural design, individually or in combination, have improved MEMS energy harvesters to achieve high enough power density, compactness and ultra wide bandwidth, bringing us closer towards battery-less autonomous sensors systems and networks in near future. Among the breakthroughs, non-linear resonating beam for wide bandwidth resonance is the key development to enable robust operation of MEMS energy harvesters over the unpredictable and uncontrollable frequency spectra of ambient vibration. We expect that a coin size harvester will be able to harvest about 100μW continuous power at below 100 Hz and less than 0.5 g input vibration and at reasonable cost.

Fabrication Methods for Improved Electromechanical Behavior in Piezoelectric Membranes

2005 ◽  
Vol 872 ◽  
Author(s):  
M.C. Robinson ◽  
P.D. Hayenga ◽  
J.H. Cho ◽  
C.D. Richards ◽  
R.F. Richards ◽  
...  
Keyword(s):  
Residual Stress ◽  
Electromechanical Coupling ◽  
Silicon Oxide ◽  
Piezoelectric Materials ◽  
Electrical Energy ◽  
Fabrication Technique ◽  
Simply Supported ◽  
Electromechanical Behavior ◽  
Pzt Films ◽  
Electrode Coverage

AbstractPiezoelectric materials convert mechanical to electrical energy under stretching and bending conditions. Optimizing the coupling conversion is imperative to the electromechanical behavior of a micromachined membrane's performance. This paper discusses analytical calculations that were devised to determine the microscale structure that minimizes residual stress and outlines the implementation of fabrication technique variations including three different electrode configurations, trenching around the membrane, and reducing the total composite residual stress of the support structure using compressive silicon oxide. Lead zirconacte titanate (PZT) films between 1 and 3 μm thick with a ratio of Zr to Ti of 40:60 were deposited onto 3 mm square silicon membranes. The total tensile stress in the composite structure reaches 100 MPa during standard fabrication processing. Utilizing analytical calculations, a structure was determined that lowered the residual stress of the composite to 11 MPa and increased the electromechanical coupling 35 times. Changing the geometry of the electrode coverage decreased the residual stress of the composite by 40%. Trenching around the membrane provided a membrane with boundary conditions that approached simply supported and decreased the composite residual stress by another 16%. A comparison of the electromechanical behavior for these structures will be discussed, showing a route towards increasing electromechanical coupling in PZT MEMS.

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