Application Cases

Experiment Name: Wavefield Scanning Test

Experiment Content: Metasurfaces for elastic waves are a research hotspot in the field of elastodynamics and have a wide range of application prospects in vibration reduction and noise control, non-destructive testing, seismic engineering, and other fields. In this experiment, a metasurface sample with a working frequency of 40 kHz was tested. The transmitted wavefield behind the metasurface in a metal thin plate was scanned. The influence of plate boundary reflections was eliminated using blu-tack and a time window. The effectiveness of the designed metasurface structure was verified by comparing and analyzing the experimental, numerical, and theoretical results.

Research Direction: Wave Dynamics

Testing Equipment: ATA-2022H high-voltage amplifier, signal generator, laser vibrometer, etc.

Figure: Schematic diagram of the wavefield scanning test experiment

Experiment Process: A signal generator was used to produce a wave packet with a center frequency of 40 kHz. The piezoelectric ceramic was excited by the ATA-2022H high-voltage amplifier to generate bending waves in the plate. The transmitted wavefield was scanned using a laser vibrometer, and the measured signals were transmitted and stored in a computer via a data acquisition system. A post-processing program for Fourier transform was developed to transform the time-domain signals into the frequency domain. The wavefield at the working frequency of 40 kHz was compared with the numerical results, showing good agreement and verifying the designed metasurface sample.

Experiment Results:

Figure: Experimental Results

The following two contour maps represent the experimental (exp.) and numerical (sim.) results of the metasurface transmission field, respectively. It can be seen that both the experimental and numerical field maps exhibit cylindrical wavefront patterns, and the amplitude increases from the center to the sides. In addition, the amplitude in the center of the experimental field map is slightly higher than that of the numerical field map. This is because the design frequency of the metasurface in this experiment is 40 kHz, corresponding to a bending wavelength of only 10 mm, making the sample highly sensitive to manufacturing errors, resulting in more energy in the center of the experimental field map. The above experimental results verify the designed metasurface.

Power Amplifier Recommendation: ATA-2022B High-Voltage Amplifier

Figure: Specifications of the ATA-2022B High-Voltage Amplifier