Views:0 Author:Site Editor Publish Time: 2020-02-26 Origin:Site
Regarding piezoelectric ceramics, everyone can gradually understand the important products of website and increase their knowledge in this field. Therefore, it is beneficial to achieve the expected learning goals and requirements as soon as possible.
What are the specific values of the elastic modulus, density and poisson's ratio of the piezoelectric ceramics?
About low frequency piezoelectric block, it is usually made of PZT-4 Material. Therefore, its elastic modulus is 7. 65x 10 10 and its density is 7. 5 × 103. Poisson's ratio is 0.32. These are things we must know and master.
For piezoelectric ceramics, if they are exposed to DC voltage, will there be electrostriction?
If piezoelectric ceramics are exposed to DC voltage, there is no current will flow through them. Therefore, it is not electrostrictive. However, if it is under an alternating electric field or an alternating voltage, there will be electrostriction, but only a small current will flow through it. This is because piezoelectric ceramics have very high input resistance, so they can be regarded as insulators. Therefore, it has only a small amount of current will flow through it.
If the operating point of the piezoelectric ceramic transducer does not work at its resonant frequency, what effect will it have?
For piezoelectric ceramic transducer, if it has a natural resonant frequency of piezo ceramic cylinder. Therefore, if it does not work at this time, the sensitivity of the sensor will be reduced. If it is serious, it will also hinder the measurement work and make the sensor unable to work normally.
Why is the piezoelectric ceramic transducer moisture-proof?
This is because if piezoelectric ultrasonic transducer is affected by moisture, they are prone to short circuits and other problems, which affects the normal use of piezoelectric ceramics. It should be noted that it is greatly affected by ambient humidity. Therefore, piezoelectric ceramics should be affected by humidity, so as not to affect their use.