Application Cases

Experiment Name: Experimental Verification of Selective Excitation for Spin Control of Elastic Waves in Lamb Waves

Experiment Content:
Utilizing a multi-channel power amplifier to excite a pair of piezoelectric patches, generating circularly polarized vibrations, and observing the propagation direction and A/S components of Lamb waves.

Research Direction: Spin Control of Elastic Waves

Test Equipment: Signal generator, ATA-2022H high-voltage amplifier, piezoelectric patches, aluminum plate, laser vibrometer, etc.

Figure 1: Experimental Framework Diagram

Figure 2: Experimental Content Diagram

Experimental Procedure:

1. Experimental Preparation:
   Two mutually perpendicular piezoelectric patches are connected to two excitation signals from the power amplifier, enabling the excitation of elastic waves with non-zero spin angular momentum at the edge of the aluminum plate. Through simulations, it can be observed that the vibration modes on both sides of the thin plate correspond to the A and S modes of Lamb waves, demonstrating that spin sources can achieve selective directional excitation.

2. Experimental Platform Setup:
   Two signal sources are connected to the two input ports of a dual-channel power amplifier, and the outputs are linked to the two perpendicular piezoelectric patches. This allows for the adjustment of the circular polarization direction of the vibration source. Subsequently, the vibration source is attached to one side of the thin plate for excitation, and a laser vibrometer is used to measure and compare the resulting vibration signals.

Experimental Results:

Figure 3: Experimental Results

After calibrating the vibration signals received by the laser vibrometer, multi-point vibration signals are obtained through scanning. These signals are then processed using Fourier transform to convert them from the position-time domain to the frequency-wavenumber domain. The processed data is compared with the theoretical dispersion curves of Lamb waves. The experimental results show that the A and S modes are successfully excited on either side of the spin source, consistent with theoretical and simulation predictions.

Recommended Voltage Amplifier: ATA-2022B

Figure: ATA-2022B High-Voltage Amplifier Specifications

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