Application Cases

In the modern technological development process, the application scenarios of acoustic detection technology are constantly expanding. Fields such as non-destructive testing, underwater detection, and medical diagnosis all rely on the effective utilization of sound waves. In these applications, electroacoustic equipment, as a key part, has its detection performance closely linked to acoustic characteristics. With the growing application demands, the requirements for the detection performance of electroacoustic equipment are increasingly high, making the enhancement of acoustic characteristics one of the key issues for the development of this field. The coupling of acoustic functional devices with electroacoustic equipment provides a new direction for improving acoustic characteristics. However, the existing complex structures and limited sound wave control capabilities of these devices make it difficult to adapt to the development trend of integration, miniaturization, and intelligence of electroacoustic equipment. Therefore, there is an urgent need to explore new theories, mechanisms, and structures.

In the research on improving the detection performance of electroacoustic equipment, power amplifiers are an important factor. In underwater sonar detection, detection capability is closely related to sound pressure level. During the research process of acoustic functional devices, such as when conducting experimental tests on various types of acoustic functional devices, power amplifiers play an indispensable role in driving the sound wave probes to generate the required sound waves. Therefore, studying how to better utilize power amplifiers in the design of acoustic metamaterials and new types of acoustic functional devices has become an important link in promoting the development of electroacoustic equipment technology.

The power amplifier selected for this experiment is the Aigtek ATA-2021H, with an adjustable output voltage gain of x0~60 (0.1 step/1 step), a maximum output voltage of 200 Vp-p (±100 Vp), and a maximum output current of 500 mA (＞50 Hz).

Experiment Name: Acoustic Fingerprint Imaging Visualization System Experiment

Experiment Principle:

The principle of the shadowgraph visualization system experiment is based on the effect of sound wave propagation on air density and the principle of light refraction. As sound waves propagate, air parcels undergo expansion and compression, forming regions of rarefaction and compression, which lead to local changes in air density and, consequently, changes in the refractive index. Light rays emitted from a point source and converged by a concave mirror are deflected from their original path due to the changes in the refractive index of the air caused by the sound waves, falling outside the camera aperture and creating bright and dark fringes in the shadowgraph image area. These fringes correspond to the actual sound field, achieving the visualization of sound waves. In the experiment, a target frequency of 25 kHz square wave signal is generated by the signal generator, amplified by the power amplifier to drive the sound wave probe array to emit sound waves. The sound waves propagate in the form of plane waves through a rectangular waveguide and enter the sample. The LED point source signal is synchronized with the target frequency signal, and fine-tuning the frequency difference can assist in observing the "propagation" of sound waves, thereby studying the propagation characteristics of sound waves within the sample.

Experiment Block Diagram:

Experiment Photographs:

Experiment Process: The shadowgraph visualization system experiment aims to observe the "acoustic invisibility" phenomenon of the acoustic invisibility cloak, where the power amplifier plays a key role. During the experiment, a target frequency of 25 kHz square wave signal is generated by the signal generator. This signal has insufficient power to directly drive the sound wave probe array to produce sound waves that meet the experimental observation requirements. At this point, the power amplifier (Aigtek ATA-2021H) amplifies the signal, enhancing its power. The amplified signal drives the sound wave probe array to emit sound waves, which propagate in the form of plane waves through a rectangular waveguide with absorbing boundaries and enter the sample prepared by 3D printing. Light rays emitted from the point source are converged by the concave mirror, and the camera is placed at twice the focal length of the concave mirror. Due to the changes in air density and refractive index caused by sound wave propagation, the light rays are deflected, forming bright and dark fringes in the shadowgraph image area that correspond to the actual sound field. These fringes are captured by the camera and transmitted to the computer for processing. The LED point source signal is synchronized with the target frequency signal, and fine-tuning the frequency difference can assist in observation. In this process, the power amplifier is the key device that enables effective signal amplification. It ensures that the sound wave probe can emit sound waves of sufficient intensity, making the experimental phenomena more evident and ensuring the smooth progress and observation effect of the entire shadowgraph visualization system experiment.

Application Directions: Acoustic research, development and testing of acoustic functional devices, underwater detection, medical diagnosis, security and military

Application Scenarios: Acoustic fingerprint imaging visualization system, experimental process, sound wave visualization, acoustic characteristic observation, acoustic metamaterials, acoustic invisibility cloak, acoustic diffraction metasurface, near-zero refractive index metamaterials

Product Recommendation: ATA-2000 Series High-Voltage Amplifiers

Figure: Specifications of the ATA-2000 Series High-Voltage Amplifiers