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Piezoelectric Transducer application

Views:6     Author:Site Editor     Publish Time: 2019-02-16      Origin:Site

A ultrasonic transducer is a device that converts mechanical vibration into electrical signals or mechanical vibrations driven by an electric field. Piezoelectric polymer electroacoustic devices utilize the transverse piezoelectric effect of the polymer, while transducer design utilizes polymer piezoelectric.The bending vibration of a bimorph or piezoelectric single wafer driven by an external electric field can produce electroacoustic devices such as a microphone, a stereo earphone, and a tweeter using the above principles. At present, the research on piezoelectric polymer electroacoustic devices mainly focuses on the characteristics of piezoelectric polymers, and develops devices that are difficult to realize by other current technologies and have special electroacoustic functions, such as anti-noise telephones and broadband ultrasonic signal transmission systems.


(1)Application of piezoelectric pressure sensor:

Piezoelectric pressure sensors are made by using the piezoelectric effect of piezoelectric materials. The basic structure of the Pzt ceramic sensor is shown. Since the amount of charge of the piezoelectric material is constant, special care must be taken when connecting to avoid leakage. The piezoelectric pressure sensor has the advantages of self-generated signal, large output signal, high frequency response, small volume and firm structure. The disadvantage is that it can only be used for kinetic energy measurements. A special cable is required, and self-recovery is slow when subjected to sudden vibration or excessive pressure.


(2) Piezoelectric accelerometer sensor:
The piezoelectric ceramics element is generally composed of two piezoelectric wafers. Electrodes are plated on both surfaces of the piezoelectric wafer, and leads are drawn. A mass is placed on the piezoelectric wafer, and the mass is generally made of a relatively large metal tungsten or a high specific gravity alloy. The mass is preloaded with a hard spring or bolt, and the entire assembly is housed in a metal housing of the original base. In order to isolate any strain of the test piece being transmitted to the piezoelectric element to avoid false signal output, it is generally necessary to thicken the base or use a material with a relatively high rigidity. The weight of the housing and the base is almost the weight of the sensor. When is measuring, the sensor base and the test piece are rigidly fixed together. When the sensor is subjected to a vibration force, since the rigidity of the susceptor and the mass is relatively large, and the mass is relatively small, the inertia of the mass can be considered to be small. Therefore, the mass is subjected to the same motion as the susceptor and is subjected to an inertial force opposite to the direction of acceleration. Thus, the mass has a strain force proportional to the acceleration acting on the piezo cylinder ceramic transducer. Since the piezoelectric wafer has a piezoelectric effect, an alternating charge (voltage) is generated on its two surfaces. When the acceleration sensor is much lower than the natural frequency of the sensor, the output voltage of the sensor is proportional to the force, that is, It is proportional to the acceleration of the test piece. The output power is led out from the sensor output. After input of the preamplifier, the acceleration of the test piece can be tested with a common measuring instrument. If an appropriate integrating circuit is added to the amplifier, it can be tested. They are vibration speed or displacement of the test piece.


3. Piezoelectric drive:
Piezoelectric actuators use the inverse piezoelectric effect to convert electrical energy into mechanical or mechanical motion. Polymer drivers are based primarily on polymer bimorphs, including driver applications based on polymer bimorphs using both lateral and longitudinal effects. Research includes display device control, micro-displacement generation systems, and the like. A lot of research is needed to make these creative ideas practical. Electron beam irradiation of P(VDF-TrFE) copolymers gives the material the ability to produce large stretch strains, creating favorable conditions for the development of new polymer drivers. Under the impetus of potential defense applications, the use of radiation-modified copolymers prepare all-polymer materials for underwater acoustic emission devices .Piezo ceramic disc crystal is being systematically carried out with the support of the US military. In addition, the use of radiation-modified copolymers for excellent properties,there is research and development in medical ultrasound, vibration and noise reduction applications.


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