periodic pulse of piezo ceramic

For a 2 mm thickness piezo ceramic, using a periodic pulse of 79.666 kHz as the excitation will give the best received signal, and the embedded ultrasonic testing will also conclude the energy of the signal receiver when piezo power generation is stimulating with a 79 kHz.sine pulse is the largest. This article uses a 79 kHz periodic pulse as the excitation signal and receivers at the end of the buried ultrasonic non-destructive testing system.in order to study the effect of piezoelectric plate sensoron its vibration amplitude. The thickness of the PZT-5H piezoelectric ceramic according to the above method is modal analysis was performed at 0.5 mm, 0.8 mm, 0.9 mm, 0.95 mm, 0.98 mm, 1 mm, 3 mm, and 5 mm. 

The maximum amplitude of the piezoelectric material piezo platereached at the corresponding thickness and the corresponding harmonic frequency are displayed. With the increasing of the thickness of piezoelectric ceramics, the maximum amplitude of piezoelectric ceramics gradually decreases: when the thickness of piezoelectric ceramics is less than 1 mm, there are multiple inflection points in the resonant frequency curve; when the thickness of piezoelectric ceramics is greater than 1 In mm, the resonant piezoelectric plate sensor manufacturer gradually decreases as the thickness increases.Because the crystal structure of PZT piezoelectric ceramics has a certain size limit in the design of single-layer piezoelectric ceramics, the thickness is generally more than 1 mm, and in the case of piezoelectric ceramics with a  thickness of less than 1 mm, multi-layer structures are often used.piezoelectric material piezo tubeof vibration mode is duo to thickness. 

When the thickness of piezoelectric ceramic is larger than 1 mm, the maximum amplitude value becomes smaller as the thickness of the piezoelectric ceramic increasing, and the piezo ring vibration transducer gradually decreases, and the resonance frequency that maximizes its vibration amplitude gradually becomes smaller. The maximum amplitude of the 2 mm piezoelectric ceramic corresponds to a resonance frequency of 5.34% with respect to 1 mm of the piezoelectric ceramic, and the maximum amplitude of the 3 mm piezoelectric ceramic corresponds to a resonance frequency of 10.66% with respect to 1 mm  piezoelectric ceramic. The resonance frequency of a 5mm piezoelectric light sensor is reduced by 17.3% with respect to a 1 mm piezoelectric ceramic. This shows that the maximum amplitude of the piezoelectric ceramic corresponds to a nonlinear relationship between the resonant frequency and the thickness change, and the piezoelectric ceramic corresponds to the increase by thickness. The resonant frequency changes gradually.