Application Cases

Driven by the demands of marine resource development and national strategic advancement, underwater acoustic detection technology continues to evolve and innovate. Within this field, underwater acoustic transducers, as the core components for transmitting and receiving underwater acoustic waves, play a crucial role, making performance enhancement essential. Broadband transducers offer significant advantages in underwater acoustic signal transmission. However, achieving broadband transmission for high-frequency transducers remains challenging. Broadband transducers possess numerous benefits.

Experiment Name: Testing of Relaxor Ferroelectric Single-Crystal Underwater Acoustic Transmitting Transducers

Experimental Principle:
This study demonstrates that when a transmitting transducer has multiple resonant frequencies, selecting an appropriate matching frequency can achieve significantly broad bandwidth. The findings indicate that when the matching frequency corresponds to the transducer's lower or mid-range resonant frequencies, the -3dB fractional bandwidths are 48% and 56%, respectively, while the -6dB fractional bandwidths are 68% and 78%, respectively. The maximum transmitting voltage responses within the -6dB bandwidth are 140.1dB and 138.1dB, respectively. Compared to the transducer without acoustic matching (-3dB fractional bandwidth of 33%, -6dB fractional bandwidth of 59%, and transmitting voltage response of 146.6dB), the bandwidth is improved. However, when matched to the higher resonant frequency, the -3dB fractional bandwidth reaches 67% (88–177kHz), and the -6dB fractional bandwidth achieves 107% (79–259kHz), along with a high transmitting voltage response of 143.5dB. The fabricated transducer measures 19mm × 25mm in size, demonstrating that the designed transducer can achieve high-frequency broadband underwater acoustic transmission in a compact form.

Experimental Block Diagram:

Experimental Setup Photo:

Experimental Procedure:
In this experiment, a pool measuring 5m in length, 3m in width, and 2m in depth was used. A designed testing setup was employed to fix the transducer under test and a standard hydrophone at a depth of 1m below the water surface, with a horizontal distance of 1m between them. As shown in the schematic diagram, a signal generator (Keysight 33600A) was used to produce sinusoidal pulse signals at the corresponding frequencies. These signals were amplified by a power amplifier (Aigtek ATA-L6) and connected to the positive and negative terminals of the transducer under test. A standard hydrophone (Teledyne RESON TC4034) was used to receive the acoustic waves emitted by the transducer. The received signals were displayed on an oscilloscope (Keysight DSOX3014T), while another channel of the oscilloscope was connected to the monitoring port of the power amplifier to observe the frequency, amplitude, and other information of the output signal.

Application Areas: Marine Acoustics, Piezoelectric Materials, Underwater Engineering

Application Scenarios: Acoustic Transducers, Broadband Transducers, Relaxor Ferroelectric Single Crystals, Acoustic Matching Layers, Electrical Impedance Matching, Lateral Vibration Orthogonal Acoustic Beam Mode, Finite Element Simulation

Product Recommendation: ATA-L Series Underwater Acoustic Power Amplifiers

Figure: ATA-L Series Underwater Acoustic Power Amplifier Specifications

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