Application Cases

Experiment Name: Ultrasonic Standing Wave Multilayer Suspension Experiment and Simulation

Figure 1: Photograph of the Ultrasonic Standing Wave Suspension Test System

In the experiment, an ultrasonic standing wave suspension test system was built using an ATA-2022B high-voltage amplifier, function signal generator, oscilloscope, ultrasonic transducer, reflector, and high-speed imaging measurement system. First, a multilayer suspension test was conducted. The signal generator was adjusted to output a square wave signal with a frequency of 40 kHz, an amplitude of 20 Vrms, and a duty cycle of 50%, allowing the transducer to operate at its optimal resonant state. When the resonant cavity length h was adjusted to approximately 35 mm, stable suspension of eight polystyrene spheres in air was achieved, as shown on the left side of Figure 2. Calculations indicated that the theoretical resonant cavity distance for the eight-layer suspension mode should be 33.5875 mm, with an error of about 4.205% compared to the experimental value.

Figure 2: On the left is the eight-layer suspension test, and on the right is the nine-layer suspension test.

When the resonant cavity distance h was set to 39.5 mm, a nine-layer suspension mode of polystyrene spheres was achieved, as shown on the right side of the figure. Compared to the eight-layer suspension, the radial displacement of the spheres increased significantly. The spheres continuously oscillated left and right around the central axis and, after minor disturbances, had difficulty returning to the stable suspension point, eventually escaping the acoustic field. This occurred because, as the resonant cavity distance increased, the energy loss in the acoustic field grew, reducing the suspension force experienced by the spheres and decreasing their suspension stability.

Voltage Amplifier Recommendation: ATA-2022B

Figure: Specification Parameters of the ATA-2022B High-Voltage Amplifier

• Bandwidth: (-3dB) DC~1MHz

• Voltage: 200Vp-p (±100Vp)

• Current: 500mAp

• Power: 50Wp

• Slew Rate: ≥445V/us

• Applications: Ultrasonic testing, non-destructive testing, driving piezoelectric ceramics, dielectrophoretic cell sorting, ultrasonic atomization, ultrasonic focusing

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