Questions tagged [piezoelectric-effect]

Piezoelectric Effect is the ability of certain materials to generate an electric charge in response to applied mechanical stress.

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What drives mechanical piezo device ultrasound maximum (sound) power output - electrical power or voltage?

Many definitions of piezo devices say that they convert mechanical energy to electrical (voltage) potential energy. This gives the impression that you want a high voltage to drop onto piezo device ...
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Piezoelectric Harvester Circuitry

Can anyone tell me what type of circuit is used in this piezoelectric harvester? And if possible, could you also provide a diagram of it when connected to battery?
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How does direct piezoelectric effect convert mechanical energy into electrical energy?

I am studying direct piezoelectric effect and if I understand it well the idea of direct is that if we apply force in an hexagonal cell unit for example, we create a polarisation, but how do we ...
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Can I increase the inductive component stored-energy of a Piezo Buzzer?

In this example of a model for a piezo element, there is an inductive component (I think this is a quartz crystal model -- it should not matter for the question. This graphic was also used here and ...
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How to check if the piezoelectric sensors are working properly?

I am performing an experiment where 4 piezoelectric sensors are placed diagonally at the corners of an aluminised kapton foil, which is attached to a frame. The sensors are attached at 45 degree angle ...
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A piezoelectric battery

This question is of a purely theorethical nature. Applying pressure to a piezoelectric material creates voltage, and the inverse is also true. I have seen this likened to a spring, and was wondering ...
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Piezoelectricity question

If I have a piezoelectric crystal and apply pressure to it , it will be deformed and a voltage between its 2 ends will be generated. Is the voltage generated due to its deformation or due to the ...
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Interfacing a piezoelectric pressure sensor with a microcontroller

I'm working on monitoring injection molding process pressure inside the mold. The pressure range is expected to be between 1500 - 3000 bar. The mold temperature is expected to be around 100C while the ...
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What are the advantages and advantages of ceramic and Langevin transducers for ultrasonic cleaners?

I have an old large ultrasonic cleaner with 5 ceramic piezo electric transducers (pictured below) epoxied to its tank's underside. They use around 40W of power each. Newer ultrasonic cleaners, ...
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Help with piezoelectric circuit [closed]

I connected three piezoelectric sensors to a rectifier which was further connected to a capacitor (100µF). I kept hitting the sensors for some time, and measured the voltage across the capacitor using ...
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What is being depicted in these piezoelectricity circuit diagrams?

I am currently studying Ultrasonic transducers – Materials and design for sensors, actuators and medical applications by Kentaro Nakamura. Chapter 1.2.2 Piezoelectricity says the following: ...
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Voltage generated by piezoelectric effect

When you apply a voltage to a insulator if the insulator is shaped appropriately its shape is changed. When the piece of insulator returns to its initial state a voltage is generated by which is its ...
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What happens when DC is applied to a piezo crystal?

I've heard that when an alternating current is passed through a piezo crystal it vibrates. But what happens if a direct current is passed through the crystal? I'm assuming depending on the direction ...
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Digitized Voice over piezoelectric speaker

My objective is too implement a security system that is triggered when someone breaks the IR beam. This IR beam has a digital output pin. Which goes high (5V) when the beam is broken. This signal then ...
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How to drive a piezo transducer

I am looking to drive a piezo transducer at its resonant frequency (20kHz) to generate sound waves. I am doing an application similar to sonar technology. I was looking into how to drive the ...
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Do ultrasonic transducers generate sound because of current, voltage, or change in either of those?

I have been working on a pulse generator circuit which will be used to drive an ultrasonic probe. In the circuit below, the 50Ω resistor is modeling the probe. I have researched the piezoelectric ...
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Confused with figuring out this piezoelectric sensor

I have this impulse-hammer with this specific model data-sheet. It has output through BNC and if I hook it up to a scope or a daq board, I see nothing but some 50Hz noise when the hammer is hit. ...
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The relation about FOM and power extraction improvement

I saw some paper,their comparison is FOM or Power Extraction Improvement(called PEI here),and they are related,PEI=FOM*100,when FOM*100,the PEI value will usually bigger than 100%,take 126% or 425% ...
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Quartz Crystal Oscillator Principle

I understand quartz crystal oscillator quite good, but there are two things I am not clear with: When quartz crystal wafer is squeezed, at that point, does it generate unlimited current capability? ...
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Fast knock detector circuit with digital output

I am trying to design a fast, simple circuit that will send a short (~2ms) logic-level pulse (either high or low, don't care) to a micro controller, every time a Piezo Transducer detects a knock. The ...
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Interface Piezoelectric wafer buzzer with microcontroller

Can piezo-buzzer be interfaced with MCU same as normal 5V continuous buzzer? I am talking about the flat thinnest buzzer like this. We need to feed PWM to this to create different tones right? If ...
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Is it possible to get a constant voltage using piezoelectric crystal by giving mechanical stress?

Is it possible to get a constant voltage using piezoelectric crystal by giving mechanical stress? If it so , can I charge a 5v battery using piezoelectric effect
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Circuit feedback with mutual inductance on a toroid

I have been reviewing a circuit for the past few days and I am hoping to get some feedback to verify my thoughts as to how the circuit is working. This is a driving circuit for an ultrasonic cleaner ...
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Piezoelectric Voltage and current measurement across a 3.3kohm resistor.

I am testing a PZT 43 material with tapping sequence. The measurement of the material is: 10mm in length and 0.8CM in diameter. I am tapping the material with a plastic and holding it down with a fat-...
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Ultrasound transducer at different frequencies

An ultrasound transducer is specified to have two standard frequencies; 820 KHz, and 2.5 MHz, does this mean that any frequency in-between can be used? If not, what would happen if a generated signal ...
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Driving Ultrasonic Transducer

Because my system needs higher power for the ultrasonic transducer, I need to drive the transducer with higher voltage. I came up with following ideas driving transducer with 10V peak to peak voltage....
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piezoelectricity [closed]

By knowing some of the features of piezoelectric sensor, I want to know more about this sensor. how does it actually works? Does it require application of pressure and releasing that pressure often to ...
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What are the advantages of a photonic crystal versus a liquid crystal or piezoelectric grating tunable optic filter?

I want to design a tunable optical filter that can quickly change from being a red light filter to being a blue light filter. For this purpose, I am wondering about photonic crystal tunable optical ...
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Piezoelectric vibration energy harvesting

Recently I'm working on a project aiming to convert the vibration of sound waves into electricity to charge batteries using a piezoelectric material (MFC type). I was trying to use the human voice as ...
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11 votes
1 answer
633 views

About the audible noise of capacitor

All dielectric materials deform under the stress of an electric field, it's called "electrostrictive effect". And some dielectrics exhibit an additional piezoelectric effect, such ceramic capacitors, ...
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