THREE QUESTIONS OFTEN ASKED (PIEZOELECTRIC CERAMICS SHEET )
Three questions are often asked about the piezoelectric ceramics sheet product on our website. They are;
- What is the difference between a buzzer and a piezoelectric ceramics sheet?
- How to perform a quality inspection for the piezoelectric ceramics sheets?
- How to differentiate between the positive and negative electrode of the piezoelectric sheet?
In this article, we will be answering the questions above.
What is the Difference Between a Piezoelectric Ceramics Sheet and a Buzzer?
There are several differences between the buzzer and the piezoelectric ceramics piece. The major difference is the way they emit sounds. The piezoelectric ceramics sheet despite the fact that it vibrates when excite by alternating current, the sound it emits is so small. the mismatch with the acoustic impedance of the air is responsible for this effect. On the other hand, the buzzer’s sound is amplified as a result of resonance.
How to perform a quality inspection for the piezoelectric ceramics sheets?
There are two common ways of determining the quality of piezoelectric ceramics pieces. They are as follows;
- Method 1: Using a multimeter to measure the voltage of the sheets. The quality of the sheet is relative to the swing amplitude. A large-amplitude is a sign of high sensitivity and good quality. However, the tester should take precautions like not testing with wet hands or using the DC block of the multimeter. Ignoring the precautions could impact the accuracy of the results.
- Method 2: Measure the two-pole resistance of the piezoelectric sheet using a multimeter. An infinite result is an indication of good quality. Alternatively, if a gentle tap from the tester on sheet results in a slight swing across the multimeter, then the sheet is of good quality.
How to differentiate between the positive and negative electrode of the piezoelectric sheet?
Similar to other tests highlighted above, we will be using a multimeter. The test is difficult and all the tester has to observer is the current block of the multimeter. Firstly, the tester connects the wires from the multimeter to the two poles of the piezoelectric sheet. A swing to the right of the multimeter will signal that the red wire is on the positive electrode. Likewise, a swing to the left will indicate that the black wire is on the positive electrode. Using this method, you can easily determine both the positive and negative electrode of a piezoelectric ceramics sheet.