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How to use a piezo transducer?

Views: 4     Author: Site Editor     Publish Time: 2022-07-19      Origin: Site

We face various situations where we have to measure physical quantities like mechanical stress applied on metal and temperature levels in our daily life. For all these applications we need a device which could measure these unknown quantities in units and calibrations familiar to us. One such device which is most useful to us is the piezo transducer. A piezo transducer is one type of transducer, which is common in our life. Wonder how to use a piezo transducer?


1.What are the types of piezo transducers?

2.How to use a piezo transducer?

3.What are the applications of piezo transducers?


What are the types of piezo transducers?


1.Piezoelectric force sensor: Piezoelectric element itself is a force-sensitive element. The key to using piezoelectric element to make force-electricity conversion force sensor is to select suitable piezoelectric material, deformation method, the number of wafers which is in mechanically series or parallel, the geometric size of the wafers and the reasonable force transmission structure. The deformation method of the piezoelectric element is the most convenient to use the thickness deformation of the longitudinal piezoelectric effect, and the choice of the piezoelectric material depends on the range of the measured force, the accuracy of measurement and working environment conditions.

2.Piezoelectric pressure sensor: Most piezoelectric pressure sensors are made by using the positive piezoelectric effect. The positive piezoelectric effect refers to when the crystal is subjected to an external force in a certain direction, electric polarization occurs inside the crystal, and charges with opposite signs are generated on two surfaces at the same time; when the external force is removed, the crystal returns to an uncharged state. When the direction of the external force changes, the polarity of the charge also changes; the amount of charge generated by the crystal is directly proportional to the magnitude of the external force.

3.Piezoelectric acceleration sensor: a piezo transducer that uses the inertial force of the mass to measure the acceleration of the movement of an object. In order to obtain higher sensitivity, the inertial force shown by the measuring mass when accelerating with the measured object is usually used to determine its acceleration. In the case of constant mass, the acceleration value can be obtained by measuring the inertial force. The piezoelectric transducer is composed of a shell, a mass, a force-sensitive element, which is piezoelectric element, and a spring that limits the relative movement between the mass and the shell.


How to use a piezo transducer?


  • Using a piezoelectric sensor is the simplest task, just connect the positive and negative terminals to the circuit and press the top of the piezo transducer. Due to mechanical pressure, it will generate a voltage at the output by pressing, which will be further fed into the circuit. You can simply connect the LED to the piezoelectric sensor as shown in the circuit below. Whenever you press the piezo transducer, the LED will flash.

Piezoelectric transducer is a typical self-generating sensor. It is a sensor whose conversion principle is the piezoelectric effect that generates electric charge on the surface of certain crystals after being forced. Some crystals, when subjected to an external force along a certain direction, polarization occurs inside, and charges of opposite signs are generated on two surfaces at the same time. When the external force is removed, it returns to an uncharged state. When the direction of the force changes, the polarity of the charge also changes, and the amount of charge produced by the crystal is proportional to the magnitude of the external force. The above phenomenon is called the positive piezoelectric effect. Piezoelectric transducer is mostly made of the positive piezoelectric effect of piezoelectric materials.


What are the applications of piezo transducers?


1.Glass break alarm device: Paste the polymer piezoelectric vibration measuring film on the glass, you can feel the vibration that will be emitted when the glass is broken, and transmit the voltage signal to the centralized alarm system. Piezoelectric transducers can only be used for dynamic measurement. The charge generated by the external force acting on the piezoelectric element can only be stored without leakage, that is, the measurement circuit needs to have infinite input impedance, which is actually impossible.

2.Piezo perimeter alarm system: Buried long piezoelectric cables in the shallow layer of the soil can act as a distributed underground microphone or listener. It can detect people's walking within a range of tens of meters. It can also process signals for wheeled or tracked vehicles.

3.Traffic monitoring: Buried polymer piezoelectric cables on the highway, you can obtain vehicle classification information, vehicle speed monitoring, toll station scales, red light shooting, parking area monitoring, and traffic data information collection.

4.Piezoelectric vibration acceleration sensor: The acceleration sensor can be used to judge the collision of the car, so that the airbag can be inflated quickly, thereby saving lives. It can also be installed on the side wall of the cylinder to try to make the ignition moment close to the knock zone without knocking, but it can also make the engine Output as much torque as possible.


Learning something about piezo transducers can help you know the types of the piezo transducers and the applications of piezo transducers. If you want to buy high-quality piezo transducers with reasonable price, Kailitech Electronics can provide you with the best products. We manufacture piezo sound components and piezo ultrasonic products, covering wide application range including home appliances, medical devices, various alarm devices and piezo ultrasonic transducers. Kailitech has established an independent R & D centre, integrating production, education and research with great advantages to design and manufacture customized models. For details of our lab please refer to https://www.kailitech.net/Qulity-Control.html


Thanks for your kind attention, and we wait for your enquiries.

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