Application Cases

Experiment Name: Lamb Wave Communication

Experiment Content: In the field of structural health monitoring, ultrasonic guided waves have advantages over bulk waves in terms of long transmission distance, wide coverage, and low detection cost. A data transmission system based on Lamb waves was built on an aluminum alloy plate, consisting of a signal generator, power amplifier, transmitting piezoelectric transducer, receiving piezoelectric transducer, and acquisition card. At the transmitter end, the transmitting piezoelectric transducer is excited to generate Lamb waves in the structure using the inverse piezoelectric effect. At the receiver end, the piezoelectric effect is used to complete the acquisition and demodulation of the Lamb wave signal, achieving wireless data communication based on Lamb waves.

Research Direction: Lamb Wave Communication

Testing Equipment: ATA-2022H high-voltage amplifier, signal generator, piezoelectric ceramic, acquisition card, etc.

Figure 1: Schematic diagram of the Lamb wave communication experimental setup

Experiment Process: First, the transmission waveform is modulated using methods such as on-off keying and pulse position modulation. Then, the modulated waveform is output by the signal generator, amplified by the power amplifier, and used to drive the transmitting piezoelectric transducer. The signal is collected at the receiving end using a data acquisition card.

Experiment Results:

Figure 2: Experimental results of Lamb wave communication

Firstly, through frequency-sweeping experiments, it was found that on a 1.5 mm thick aluminum plate, Lamb waves have a large output amplitude in the frequency range of 400 kHz to 500 kHz. A Lamb wave at 500 kHz was chosen as the carrier for data communication, and the transmission information was modulated using methods such as on-off keying and pulse position modulation. Tests were conducted for different code lengths ranging from 4 to 64. The results showed that the original information was perfectly reconstructed using the shift-invariant sparse reconstruction method, which is faster and more accurate than the traditional cross-correlation method, achieving reliable and convenient Lamb wave data communication.

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

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